Patent Publication Number: US-5529642-A

Title: Nickel-based alloy with chromium, molybdenum and tantalum

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a Ni-based alloy which is excellent in anti-corrosion properties, in particular anti-pitting corrosion property and anti-crevice corrosion property in an environment containing chlorine ions, as well as in workability, in particular workability in hot working. 
     2. Conventional Art 
     Ni-based alloys having excellent anti-corrosion properties have hitherto been used in the manufacture of exhaust gas desulfurizers for chemical plants, electroplating devices, boilers or the like; structural members for semiconductor devices; food processing devices; medical equipment; and various cutter blades and manual tools which are exposed to sea water; or the like. 
     Ni-based alloys conventionally known as such anti-corrosive alloys include a Ni-based alloy (hereinafter referred to as &#34;alloy 55C&#34;) disclosed in Japanese Patent Application, Laid-Open (First-Publication) No. 62-40337, and consisting of 30.1 weight % of Cr, 20.3 weight % of Mo, balance Ni and unavoidable impurities; a Ni-based alloy (hereinafter referred to as &#34;alloy 625&#34;) disclosed in U.S. Pat. No. 3,160,500 and consisting of 21.5 weight % of Cr, 9 weight % of Mo, 2.5 weight % of Fe, 3.7 weight % of Nb, balance Ni and unavoidable impurities; a Ni-based alloy (hereinafter referred to as &#34;alloy C-276&#34;) disclosed in U.S. Pat. No. 3,203,792 and consisting of 16.1 weight % of Cr, 16.2 weight % of Mo, 5.2 weight % of Fe, 3.2 weight % of W, balance Ni and unavoidable impurities; and a Ni-based alloy (hereinafter referred to as &#34;alloy C-22&#34;) disclosed in U.S. Pat. No. 4,533,414 and consisting of 21.5 weight % of Cr, 13.2 weight % of Mo, 4.1 weight % of Fe, 3.1 weight % of W, balance Ni and unavoidable impurities. 
     However, the demands for the anti-corrosive Ni-based alloys having more excellent anti-corrosion properties and workability have been increasing because anti-corrosive Ni alloys are being utilized in progressively severe environments in recent years, and because the devices employed in such environments have come to have more complicated shapes. The aforesaid conventional Ni-based alloys are therefore not satisfactory. More specifically, &#34;alloy 625&#34;, &#34;alloy C-276&#34; and &#34;alloy C-22&#34; exhibit excellent workability in hot working, but are inferior in anti-corrosion properties, in particular anti-pitting corrosion property and anti-crevice corrosion property in an environment containing chlorine ions. In contrast, &#34;alloy 55C&#34; exhibits excellent anti-corrosion properties in the environment containing chlorine ions, but is inferior in workability in hot working operation. 
     SUMMARY OF THE INVENTION 
     It is therefore a primary object of the present invention to provide a Ni-based alloy which is excellent not only in anti-corrosion properties but also in workability. 
     Another object of the invention is to provide a Ni-based alloy which exhibits superior corrosion resistance in particular in the environment in which chlorine ions are contained. 
     Yet another object of the invention is to provide a Ni-based alloy which is resistant to acids such as hydrochloric acid, hydrofluoric acid, oxalic acid, phosphoric acid, or nitric acid; alkalis such as sodium hydroxide; and sea water which is neutral. 
     A further object of the invention is to provide a Ni-based alloy which is particularly resistant to a variety of sulfuric acid corrosion. 
     According to the present invention, there is provided a Ni-based alloy consisting of: 
     15 to 35 weight % of chromium; 
     6 to 24 weight % of molybdenum; 
     wherein the sum of chromium plus molybdenum is no greater than 43 weight %; 
     1.1 to 8 weight % of tantalum; 
     optionally, no greater than 0.1 weight % of nitrogen; no greater than 0.3 weight % of magnesium, no greater than 3 weight % of manganese, no greater than 0.3 weight % of silicon, no greater than 0.1 weight % of carbon, no greater than 6 weight % of iron, no greater than 0.1 weight % of boron, no greater than 0.1 weight % of zirconium, no greater than 0.01 weight % of calcium, no greater than 1 weight % of niobium, no greater than 4 weight % of tungsten, no greater than 4 weight % of copper, no greater than 0.8 weight % of titanium, no greater than 0.8 weight % of aluminum, no greater than 5 weight % of cobalt, no greater than 0.5 weight % of vanadium, no greater than 2 weight % of hafnium, no greater than 3 weight % of rhenium, no greater than 1 weight % of osmium, no greater than 1 weight % of platinum, no greater than 1 weight % of ruthenium, no greater than 1 weight % of palladium, no greater than 0.1 weight % of lanthanum, no greater than. 0.1 weight % of cerium, and no greater than 0.1 weight % of yttrium; and 
     balance nickel and unavoidable impurities. 
     With the above composition, the Ni-based alloy of the invention comes to have not only sufficient anti-corrosion properties but also excellent workability in the hot working. In particular, the Ni-based alloy of the invention is the most useful when used in an environment containing chlorine ions, and is also sufficiently resistant to acids such as hydrochloric acid, hydrofluoric acid, oxalic acid, phosphoric acid, or nitric acid; alkalis such as sodium hydroxide; and sea water which is neutral. 
     The Ni-based alloy of the invention may further be modified so as to include 17 to 22 weight % of chromium; 19 to 24 weight % of molybdenum; wherein the sum of chromium plus molybdenum is greater than 38 weight %; no greater than 3.5 weight % of tantalum; 0.01 to 4 weight % of iron; and optionally no greater than 0.01 weight % of zirconium, no greater than 0.01 weight % of boron, no greater than 0.5 weight % of niobium, no greater than 2 weight % of tungsten and no greater than 2 weight % of copper, wherein [4×niobium+tungsten+copper]≦2weight %. 
     With this modification, the resulting Ni-based alloy comes to have excellent resistance to a variety of sulfuric acidic corrosive environments. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing a test piece used in a crevice corrosion test. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The inventors have made an extensive study to develop a novel Ni-based alloy which is excellent not only in anti-corrosion properties but also in workability, and as a result, they have found that the addition of Ta (tantalum) is essential to obtain the desired properties. 
     Thus, the Ni-based alloy in accordance with the present invention is characterized in that it contains 15 to 35 weight % of Cr (chromium); 6 to 24 weight % of Mo (molybdenum), wherein the sum of Cr plus Mo is no greater than 43 weight %; 1.1 to 8 weight % of Ta (tantalum); balance Ni (nickel) and unavoidable impurities. 
     Optionally, the Ni-based alloy may further include one or more of 0.0001 to 0.1 weight % of N (nitrogen), 0.0001 to 3 weight % of Mn (manganese), 0.0001 to 0.3 weight % of Si (silicon), 0.001 to 0.1 weight % of C (carbon), 0.01 to 6 weight % of Fe (iron), 0.001 to 0.1 weight % of B (boron), 0.001 to 0.1 weight % of Zr (zirconium), 0.001 to 0.01 weight % of Ca (calcium), 0.1 to 1 weight % of Nb (niobium), 0.1 to 4 weight % of W (tungsten), 0.1 to 4 weight % of Cu (copper), 0.05 to 0.8 weight % of Ti (titanium), 0.01 to 0.8 weight % of Al (aluminum), 0.1 to 5 weight % of Co (cobalt), 0.1 to 0.5 weight % of V (vanadium), 0.1 to 2 weight % of Hf (hafnium), 0.01 to 3 weight % of Re (rhenium), 0.01 to 1 weight % of Os (osmium), 0.01 to 1 weight % of Pt (platinum), 0.01 to 1 weight % of Ru (ruthenium), 0.01 to 1 weight % of Pd (palladium), 0.01 to 0.1 weight % of La (lanthanum), 0.01 to 0.1 weight % of Ce (cerium), and 0.01 to 0.1 weight % of Y (yttrium). 
     The reasons for the restrictions on the numerical ranges for respective essential or optional ingredients in the above Ni-based alloy will be now explained in detail. 
     Chromium 
     The Cr component is dissolved in the matrix to form a solid solution therewith, and improves anti-corrosion properties such as anti-pitting corrosion property and anti-crevice corrosion property in the environment containing chlorine ions. However, if the Cr content is less than 15 weight %, such advantages cannot be expected. On the other hand, if the Cr content exceeds 35 weight %, the other useful ingredients such as Mo and Ta are prevented from dissolving into the matrix, and the aforesaid corrosion properties are deteriorated due to less presence of such effective ingredients. Therefore, the Cr content is determined so as to range between 15 to 35 weight %. The most preferable range of the Cr content is from 17 to 22 weight % for the same reasons. 
     Molybdenum 
     The Mo component is also dissolved in the matrix to form a solid solution therewith, and improves anti-corrosion properties such as anti-pitting corrosion property and anti-crevice corrosion property in the environment containing chlorine ions. However, if the Mo content is less than 6 weight %, such advantages cannot be expected. On the other hand, if the Mo content exceeds 24 weight %, the workability in hot working is extremely deteriorated. Therefore, the Mo content is determined so as to range between 6 to 24 weight % The most preferable range of the Mo content is from 17 to 23 weight % due to the same reasons. Furthermore, if Mo and Cr are added in such an amount that their total amount exceeds 43 weight %, the hot-working workability is drastically deteriorated. Therefore, the sum of Mo plus Cr is determined so as to be no greater than 43 weight %. 
     Tantalum 
     The Ta component is dissolved in the matrix to form a solid solution therewith, and stabilizes and facilitates passivation film. Specifically, it is known that the passivation film which Ni--Cr--Mo alloy forms includes NiOCr 2  O 3 , and that minute Cr 2  O 3  dominantly contributes as a protective film. When Ta is added, Ta 2  O 5  which is stronger than Cr 2  O 3  is formed in the passivation film to further stabilize the film, so that the anti-corrosion properties, such as anti-pitting corrosion property or anti-crevice corrosion property in an environment containing chlorine ions, can be further enhanced. However, if the Ta content is less than 1.1 weight %, such advantages cannot be obtained. On the other hand, if the Ta content exceeds 8 weight %, TCP phases, which are deleterious intermetallic compounds such as σ phase, P phase, Lavas phase, or μ phase, are formed in unacceptable amounts to deteriorate the workability in hot working. Therefore, the Ta content is determined so as to range between 1.1 to 8 weight %. The most preferable range of the Ta content is from 1.3 to 3.4 weight % for the same reasons. Furthermore, if Ta and Mo are added in such an amount that their total amount ranges from 13 to 26 weight %, the anti-corrosion properties can be further enhanced. 
     Nitrogen 
     The N component is dissolved in the matrix to form a solid solution therewith, and stabilizes the FCC phase and prevents the formation of deleterious TCP phases, so that the hot working workability is improved. Specifically, when Cr, Mo and Ta, which are added to improve the anti-corrosion properties, exceed certain amounts, TCP phases are unduly formed to lower the hot working workability. However, with the addition of N, the latent period for the formation of the TCP phases is prolonged to maintain the formed amount of the TCP phases in a permissible amount, and contributes to the stabilization of the FCC phases, so that the hot working workability is prevented from deteriorating. In the foregoing, if the N content is less than 0.0001 weight %, such advantages cannot be obtained. On the other hand, if the N content exceeds 0.1 weight %, nitrides such as Cr 2  N phase are separated in the matrix to deteriorate the hot working workability. Therefore, the N content is determined so as to range between 0.0001 to 0.1 weight %. The most preferable range of the N content is from 0.001 to 0.05 weight % for the same reasons. 
     Silicon 
     The Si, added as a deoxidizer, reduces oxides and prevents intercrystalline cracking. Therefore, Si reduces the intercrystalline cracking during the hot working operation to improve the hot working workability. However, if the Si content is less than 0.0001 weight %, such advantages cannot be obtained. On the other hand, if the Si content exceeds 0.3 weight %, TCP phases are formed in an undue amount to deteriorate the hot working workability. Therefore, the Si content is determined so as to range between 0.0001 to 0.3 weight %. The most preferable range of the Si content is from 0.0001 to 0.1 weight % for the same reasons. 
     Manganese 
     Although not as effective as N, the Mn component stabilizes FCC phase in the matrix to improve the anti-corrosion properties. However, if the Mn content is less than 0.0001 weight %, such advantages cannot be obtained. On the other hand, if the Mn content exceeds 3 weight %, TCP phases are unduly formed to lower the hot working workability. Therefore, the Mn content is determined so as to range between 0.0001 to 3 weight %. The most preferable range of the Mn content is from 0.0001 to 1 weight % for the same reasons. 
     Carbon 
     The C component is dissolved into the matrix to form a solid solution therewith, and stabilizes the FCC phase therein and improves the formation of deleterious TCP phases to improve the hot working workability. However, if the C content is less than 0.001 weight %, such advantages cannot be obtained. On the other hand, if the C content exceeds 0.1 weight %, the formation of carbides is unduly increased to lower the hot working workability. Therefore, the C content is determined so as to range between 0.001 to 0.1 weight %. The most preferable range of the C content is from 0.001 to 0.05 weight % for the same reasons. 
     Iron 
     As is the case with N, the Fe component is dissolved into the FCC phase in the matrix to form a substitution solid solution therewith, and stabilizes the FCC phase. Therefore, it improves the hot working workability. However, if the Fe content is less than 0.01 weight %, such advantages cannot be obtained. On the other hand, if the Fe content exceeds 6 weight %, it reduces the anti-corrosion properties in an environment containing chlorine ions, in particular anti-pitting corrosion property and anti-crevice corrosion property. Therefore, the Fe content is determined so as to range between 0.01 to 6 weight %. The most preferable range of the Fe content is from 0.05 to 4 weight for the same reasons. 
     Boron, Zirconium, Calcium 
     These ingredients enhance the hot working workability. However, if each of B, Zr and Ca is added in a respective amount of less than 0.001 weight %, such advantages cannot be obtained. On the other hand, if the amounts of B, Zr and Ca exceed 0.1 weight %, 0.1 weight % and 0.01 weight %, respectively, the hot working workability is then deteriorated. Therefore, the B, Zr and Ca contents are determined so as to range from 0.001 to 0.1 weight %, 0.001 to 0.1 weight % and 0.001 to 0.01 weight %, respectively. For the same reasons, the most preferable range is 0.002 to 0.01 weight % for B; 0.002 to 0.01 weight % for Zr; and 0.002 to 0.009 weight % for Ca. 
     Niobium, Tungsten, Copper 
     These ingredients enhance the anti-corrosion properties in an environment containing chlorine ions. However, if each amount of Nb, W and Cu is less than 0.1 weight %, such advantages cannot be obtained. On the other hand, if the amounts of Nb, W and Cu exceed 1 weight %, 4 weight % and 4 weight %, respectively, the formation of the TCP phases is unduly increased so that the hot working workability is deteriorated. Therefore, the Nb, W and Cu contents are determined so as to range from 0.1 to 1 weight %, 0.1 to 4 weight %, and 0.1 to 4 weight %, respectively. For the same reasons, the most preferable range is 0.15 to 0.5 weight % for Nb; 0.2 to 2 weight % for W; and 0.2 to 2 weight % for Cu. 
     Titanium, Aluminum, Cobalt, Vanadium 
     These ingredients enhance the hot working workability, in particular ductility and strength. However, if the Ti, Al, Co and V ingredients are less than 0.05 weight %, 0.01 weight %, 0.1 weight % and 0.1 weight %, respectively, such advantages cannot be obtained. On the other hand, if the Ti, Al, Co and V ingredients exceed 0.8 weight %, 0.8 weight 0.5 weight %, and 0.5 weight %, respectively, ductility is lowered. Therefore, the Ti, Al, Co and V contents are determined so as to range from 0.05 to 0.8 weight %, 0.01 to 0.8 weight %, 0.1 to 5 weight %, and 0.1 to 0.5 weight %, respectively. For the same reasons, the most preferable range is 0.08 to 0.4 weight % for Ti; 0.05 to 0.4 weight % for Al; 0.2 to 2 weight % for Co; and 0.2 to 0.4 weight % for V. 
     Hafnium, Rhenium 
     These ingredients enhance the anti-corrosion properties in an environment containing chlorine ions, such as anti-pitting corrosion property and anti-crevice corrosion property, and improves hot working workability. These ingredients are added especially when required to enhance these properties. However, if the Hf and Re ingredients are less than 0.1 weight % and 0.01 weight %, respectively, such advantages cannot be obtained. On the other hand, if the Hf and Re ingredients exceed 2 weight % and 3 weight %, respectively, the deleterious TCP phases are formed unduly so that the anti-corrosion properties and the hot working workability are extremely lowered. Therefore, the Hf and Re contents are determined so as to range from 0.1 to 2 weight % and 0.01 to 3 weight %, respectively. Due to the same reasons, the most preferable range is 0.2 to 1 weight % for Hf and 0.02 to 1 weight % for Re. 
     Osmium, Platinum, Ruthenium, Palladium 
     These ingredients are optionally added, and when at least one from these components is added, the hot working workability of the alloy is improved. However, if each of the Os, Pt, Ru and Pd ingredients is added in a respective amount of less than 0.01 weight %, such advantages cannot be obtained. On the other hand, if each of these ingredients is added in an amount exceeding 1 weight %, the deleterious TCP phases are formed unduly so that the hot working workability is extremely lowered. Therefore, these ingredients are determined so as to range from 0.01 to 1 weight %. For the same reasons, the most preferable range is 0.02 to 0.5 weight % for each of these ingredients. 
     Lanthanum, Cerium, Yttrium 
     These ingredients are optionally added, and improve anti-corrosion properties in the environment containing chlorine ions. However, if each of the La, Ce and Y ingredients is added only in an amount of less than 0.01 weight %, such advantages cannot be obtained. On the other hand, if each of these ingredients is added in an amount exceeding 0.1 weight %, the deleterious TCP phases are formed unduly so that the hot working workability is extremely lowered. Therefore, each of these ingredients is determined so as to range from 0.01 to 0.1 weight %. For the same reasons, the most preferable range is 0.02 to 0.08 weight % for La, 0.01 to 0.08 weight % for Ce and Y. 
     Impurities 
     It is inevitable that S (sulfur), Sn (tin), Zn (zinc) and Pb (lead) are included as impurities in the material to be melt. However, if the amounts of these impurities are no greater than 0.01 weight %, respectively, the alloy characteristics are not deteriorated at all. 
     In the aforesaid Ni-based alloy, Mg (magnesium) may be further included in an amount of 0.0001 to 0.3 weight % since Mg reduces intercrystalline cracking during hot working to improve the hot working workability. However, if the Mg content is less than 0.0001 weight %, such advantages cannot be obtained. On the other hand, if the Mg content exceeds 0.3 weight %, segregation occurs at grain boundaries, so that the hot working workability is lowered. Therefore, the Mg content is determined so as to range from 0.0001 to 0.3 weight %. The more preferable range for the Mg content is from 0.001 to 0.1 weight %. 
     The Ni-based alloys in accordance with the present invention are excellent in both hot working workability and anti-corrosion properties. Accordingly, they can be used to manufacture devices of complicated shapes used in severe environments containing chlorine ions, such as bleaching devices in the paper and pulp industry, pipings for hydrogen gas for halogenation, or HCl recovery columns. 
     As described above, the Ni-based alloys of the invention are the most useful when used in an environment containing chlorine ions. However, the application is not limited to such use, and they may be used in environments which contain acids such as hydrochloric acid, hydrofluoric acid, oxalic acid, phosphoric acid, or nitric acid; alkalis such as sodium hydroxide; and sea water which is neutral. 
     Furthermore, the inventors have found that among the Ni-based alloys of the invention, some specific alloys are very resistant to a variety of sulfuric acid corrosion. More specifically, the inventors have classified the sulfuric acid environment into the following three categories: 
     (a) a sulfuric acid environment of 60% and 80% sulfuric acid at 120° C.; 
     (b) a sulfuric acid environment containing chlorine ions which has reducing acidic characteristic; 
     (c) a sulfuric acid environment containing active carbon (i.e., unburned carbon), Fe 3+   or HNO 3  which is more corrosive with respect to oxidizing acidic characteristics. 
     The inventors have made extensive study to develop Ni-based alloys which have excellent anti-corrosion properties in the aforesaid sulfuric acid environments. As a result, they have found that a Ni-based alloy containing 17 to 22 weight % of Cr; 19 to 24 weight % of Mo, wherein the sum of Cr plus Mo is greater than 38 weight %; 0.01 to 4.0 weight % of Fe; no greater than 3.5 weight % of Ta. Optionally, at least one selected from the group consisting of 0.001 to 0.01 weight % of Zr and 0.001 to 0.01 weight % of B may be included. Furthermore, at least one of 0.1 to 0.5 weight % of Nb, 0.1 to 2.0 weight % of W, and 0.1 to 2.0 weight % of Cu may be added so as to satisfy that the total of 4Nb+W+Cu is no greater than 2.0 weight %. 
     In the foregoing, the numerical ranges for respective ingredients have been determined due to the following reasons. 
     Chromium, Molybdenum 
     As described before, the Cr and Mo components improve anti-corrosion properties, but the Cr component in particular improves the anti-corrosion property against oxidizing acids, whereas Mo enhances such properties against the non-oxidizing acids. Therefore, it is appreciated that the simultaneous addition of Cr and Mo with Ta makes the alloy to be substantially resistant in various sulfuric acidic environments. However, if the Cr content is less than 17 weight %, it is difficult to form a passivation film on the alloy surface minute enough to impart sufficient resistance to sulfuric acid. The upper limit of 22 weight % is set simply because sufficient workability is expected within this range. 
     Furthermore, if the Mo content is less than 19 weight %, sufficient anti-corrosive property against sulfuric acid cannot be obtained. On the other hand, if the Mo content exceeds 24 weight %, the resistance to the sulfuric acid including oxidizing acid is reduced. Therefore, the Mo content is determined so as to range from 19 to 24 weight %. 
     In the foregoing, Cr and Mo have properties opposite to each other. Therefore, it is important to balance the Cr and Mo contents with each other, and to determine the amount of Cr plus Mo so as to range from 38 to 43 weight %. Otherwise, the anti-corrosion property with respect to sulfuric acid is deteriorated. Accordingly, the sum of Cr plus Mo is determined so as to be greater than 38 weight % and be no greater than 43 weight %. 
     Tantalum 
     In order to ensure the well-balanced resistance to a variety of the sulfuric acidic environments, the Ta content should be from 1.1 to 3.5 weight %. For the same reasons, the most preferable range is from 1.5 to 2.5 weight %. 
     Iron 
     In order to improve the workability of plastic working, it is preferable that Fe be added in an amount of no less than 0.01 weight %. However, if the Fe content exceeds 4.0  weight %, the anti-corrosion property with respect to the sulfuric acid is deteriorated. Therefore, the Fe content has been set from 0.01 to 4.0 weight %. 
     Boron, Zirconium 
     The B and Zr contents are determined so as to preferably range from 0.001 to 0.01 weight % due to the same reasons as mentioned above. 
     Niobium, Tungsten, Copper 
     In order to ensure sufficient anti-corrosion properties with respect to the sulfuric acids as well as excellent workability, the Nb, W and Cu contents are determined so as to range from 0.1 to 0.5 weight %, 0.1 to 2.0 weight %, and 0.1 to 2.0 weight %, respectively. In addition, the sum of 4Nb+W+Cu should be no greater than 2 weight % in order to ensure superior workability. 
     The invention will be more detailedly explained by way of the following examples. 
     EXAMPLE 1 
     The raw materials were melted in a high-frequency melting furnace in an atmosphere which was set to that of a mixture of argon and nitrogen gases and the mixing ratio of N 2  as well as the pressure of the mixture were varied. The melt was cast into molds to provide ingots having a diameter of 60 mm and a length of 200 mm. The ingots thus obtained were melt again in an electroslag melting furnace to provide ingots having a diameter of 100 mm and compositions shown in Tables 1 to 15. The ingots were then subjected to homogenization treatment while keeping them at a prescribed temperature between 1150° to 1250° C. for 10 hours, and parts of the ingots were cut as test pieces for high-temperature compression tests, while the remainder was subjected to hot forging and hot rolling at prescribed temperatures between 1000° to 1250° C. to produce hot-rolled plates 5 mm thick. 
     The rolled plates thus obtained were subjected to solution heat treatment by keeping them at a prescribed temperature ranging from 1150° to 1250° C. for 30 minutes, and were further subjected to cold rolling to provide cold-rolled plates 3 mm thick. Subsequently, the cold-rolled plates were further subjected to solution heat treatment by keeping them at a prescribed temperature ranging from 1150° to 1250° C. for 30 minutes to provide Ni-based alloy plates 1 to 72 of the invention and comparative Ni-based alloy plates 1 to 14. 
     Furthermore, conventional Ni-based alloy plates 1 to 4 were produced by &#34;alloy 55C&#34;, &#34;alloy 625&#34;, &#34;alloy C-276&#34; and &#34;alloy C-22&#34;, respectively. 
     With respect to the Ni-based alloy plates 1 to 72 of the invention, the comparative Ni-based alloy plates 1 to 14, and the conventional Ni-based alloy plates 1 to 4, the high-temperature compression test, the high-temperature tension test, and anti-pitting corrosion and anti-crevice corrosion tests in the environment containing chlorine ions were carried out. 
     High-Temperature Compression Test 
     Cylindrical test pieces of 8 mm in diameter and 12 mm long were cut from the ingots by means of electrical discharging, and held at 1,100° C. for 15 minutes. Then, the test pieces were compressed at a rate of strain of 1.0 mm/sec to a target distortion of 50%, and the stresses when compressed at 10% distortion were measured to evaluate the hot working workability. The results are set forth in Tables 16 to 21. 
     High-Temperature Tension Test 
     Test pieces for high-temperature tension test were obtained from the cold-rolled plates 3 mm thick, and after having been held at a high temperature of 800° C. for 15 minutes, the test pieces were tensioned at 0.15 mm/min up to 0.2% proof stress and at 1.50 mm/min after 0.2% proof stress. Then, the elongation until breakage was performed to evaluate the workability in hot working. The results are shown in Tables 16 to 21. 
     Anti-Pitting Corrosion Test in Environment Containing Chlorine Ions 
     Test pieces of 35 mm in both length and width were prepared from the cold-rolled plates 3 mm thick, and were subjected to wet grinding to smooth the surface up to #2400. Then, the test pieces were immersed in an aqueous solution of 150° C. and pH of 2 and containing 4% of NaCl, 0.1% of Fe 2  (SO 4 ) 3 , 0.01 Mol of HCl, and 24300 ppm of Cl-- for 24 hours, and then the presence of the pitting corrosion was examined microscopically at a magnification of 40. The results of the measurements are shown in Tables 16 to 21. 
     Anti-Crevice Corrosion Test in Environment Containing Chlorine Ions 
     Test pieces of 35 mm in both length and width were prepared from the cold-rolled plates 3 mm thick, and were subjected to wet grinding to smooth the surface up to #2400. Then, in accordance with ASTM Practice G46-76B, test pieces each as shown in FIG. 1 were prepared by securing a respective plate-like test piece 1 and a respective Teflon round rod 2 by a rubber cord 3 or the like, to provide test pieces for pitting corrosion. The test pieces were then immersed in a boiling aqueous solution containing 11.5% of H 2  SO 4 , 1.2% of HCl, 1% of FeCl 3 , 1% of CuCl 2  for 24 hours, and then the depth of corrosion was measured. The results of the measurements are also shown in Tables 16 to 21. 
     As will be seen from the results shown in Tables 1 to 21, the Ni-based alloy plates 1-72 of the invention are superior in workability in hot working to the conventional Ni-based alloy plate 1, and superior in the anti-corrosion properties in an environment containing chlorine ions over the conventional Ni-based alloy plates 2, 3 and 4. Therefore, the Ni-based alloy plates 1 to 72 of the invention are superior in both the hot working workability and anti-corrosion properties when compared with the conventional Ni-based alloy plates. Furthermore, as seen with the comparative Ni-based alloy plates 1 to 14, if the composition falls outside the claimed ranges, at least one of the hot working workability and the anti-corrosion properties is inferior. 
     EXAMPLE 2 
     The same procedures as in Example 1 were repeated to produce ingots of 100 mm in diameter having compositions as shown in Tables 22 to 36, and to prepare Ni-based alloy plates 73 to 144 of the invention and comparative Ni-based alloy plates 15 to 27. Furthermore, the conventional Ni-based alloy plates 1 to 4 were again used and shown in Table 36. 
     With respect to the Ni-based alloy plates 73 to 144 of the invention and the comparative Ni-based alloy plates 15 to 26, the high-temperature compression test, the high-temperature tension test, and anti-pitting corrosion and anti-crevice corrosion tests in the environment containing chlorine ions were carried out. The results are shown in Tables 37 to 42. 
     As will be seen from Tables 37 to 42, the Ni-based alloy plates 73 to 144 of the invention are superior in workability in hot working to the conventional Ni-based alloy plate 1, and superior in the anti-corrosion properties in an environment containing chlorine ions over the conventional Ni-based alloy plates 2 to 4. Therefore, the Ni-based alloy plates 73 to 144 of the invention are superior in both the hot working workability and anti-corrosion properties when compared with the conventional Ni-based alloy plates. Furthermore, as seen with the comparative Ni-based alloy plates 15 to 27, if the composition falls outside the claimed ranges, at least one of the hot working workability and the anti-corrosion properties is inferior. 
     EXAMPLE 3 
     The raw materials were melted in a high-frequency melting furnace, and the melt was cast into ingots of 8.5 mm thick having compositions shown in Tables 43 to 46. The ingots thus obtained were heated to a temperature ranging from 1,000° to 1,230° C., and while maintaining them at this temperature, hot rolling operation was once carried out to reduce the thickness to 8 mm. Subsequently, by carrying out the hot rolling operation several times and reducing the thickness 1 mm for each operation, the thickness was reduced to 3 mm. Thus, Ni-based alloy plates 145 to 168 of the invention, comparative Ni-based alloy plates 28 to 43 and conventional Ni-based alloys 5 to 9, each of which has a thickness of 3 mm, were prepared. These Ni-based alloy plates were all examined as to the presence of cracks during the rolling operation, and the results of the examination are set forth in Tables 43 to 46. Furthermore, the aforesaid Ni-based alloys were cut into test pieces of 25 mm in length and 50 mm in breadth. Furthermore, 60% of H 2  SO 4 , 80% of H 2  SO 4 , a solution in which 1 g of active carbon was suspended in 3 cc of 60% of H 2  SO 4  (hereinafter referred to as &#34;60% H 2  SO 4  with active carbon&#34;), a solution in which 1 g of active carbon was suspended in 3 cc of 80% of H 2  SO 4  (hereinafter referred to as &#34;80% H 2  SO 4  with active carbon&#34;), a solution in which 100 ppm of HCl was added to 60% of H 2  SO 4  (hereinafter referred to as &#34;60% H 2  SO 4  +100 ppm HCl&#34;), a solution in which 10 ppm of HNO 3  was added to 60% of H 2  SO 4  (hereinafter referred to as &#34;60% H 2  SO 4  +10 ppm HNO 3  &#34;), and a solution in which 400 ppm of Fe 3+   was added as Fe 2  (SO 4 ) 3  to 60% of H 2  SO 4  (hereinafter referred to as &#34;60% H 2  SO 4  +400 ppm Fe 3+  &#34;) were prepared. These sulfuric acid solutions were heated to 120° C., and the Ni-based alloys of the invention, the comparative Ni-based alloys and the prior art Ni-based alloys were immersed in these sulfuric acid solutions for 24 hours. Then, taking the alloys out, their weights were measured, and by dividing the reduced weight by the surface area, the rate of corrosion for one year was calculated. The results are set forth in Tables 47 to 50. 
     As will be seen from Tables 43 to 50, the Ni-based alloy plates 145 to 168 of the invention are excellent in hot working workability because no cracks ocurred during the hot rolling operations. In addition, the rates of corrosion against 60% of H 2  SO 4 , 80% of H 2  SO 4 , 60% H 2  SO 4  with active carbon, 80% H 2  SO 4  with active carbon, 60% H 2  SO 4  +100 ppm HCl, 60% H 2  SO 4  +10 ppm HNO 3 , and 60% H 2  SO 4  +400 ppm Fe 3+ , were all less than 1 mm/year. Thus, the Ni-based alloy plates 145 to 168 of the invention are excellent in resistance to various sulfuric acidic environments. 
     In contrast, some of the comparative Ni-based alloy plates and the prior art Ni-based alloy plates exhibited rates of corrosion exceeding 1 mm/year, while others exhibited rates of corrosion of less than 1 mm/year, but cracked during hot rolling operation and were inferior in workability. 
     Finally, the present application claims the priorities of Japanese Patent Application No. 5-256360 filed Sep. 20, 1993, Japanese Patent Application No. 6-135079 filed on May 25, 1994, and Japanese Patent Application No. 6-15097 filed on Jun. 17, 1994, which are all incorporated herein by reference. 
     
                       TABLE 1                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  1       2       3     4     5     6                              
______________________________________                                    
Cr       20.1    21.2    19.9  21.0  18.8  19.2                           
Mo       19.7    20.8    21.9  18.2  17.4  20.9                           
Ta       1.72    1.53    1.23  3.34  3.01  1.75                           
N        0.0006  0.0284  0.0342                                           
                               0.0481                                     
                                     0.0083                               
                                           0.0445                         
Si       0.0214  0.0325  0.0224                                           
                               0.0432                                     
                                     0.0342                               
                                           0.0016                         
Mn       0.0729  0.0816  0.4253                                           
                               0.8425                                     
                                     0.1926                               
                                           0.2856                         
C        0.0058  0.0088  0.0120                                           
                               0.0109                                     
                                     0.0083                               
                                           0.0125                         
Fe       0.05    1.01    3.84  0.11  0.51  0.88                           
B        0.003   --      --    0.009 0.005 --                             
Zr       --      0.004   --    0.002 0.007 0.003                          
Ca       --      --      0.002 --    0.001 0.008                          
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 2                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  7       8       9     10    11    12                             
______________________________________                                    
Cr       17.9    18.0    20.5  21.2  19.8  19.2                           
Mo       20.1    22.3    20.6  21.0  20.7  21.5                           
Ta       1.55    2.51    1.88  1.65  1.38  1.92                           
N        0.0342  0.0253  0.0009                                           
                               0.0083                                     
                                     0.0127                               
                                           0.0210                         
Si       0.0026  0.0098  0.0002                                           
                               0.0981                                     
                                     0.0218                               
                                           0.0113                         
Mn       0.0172  0.0036  0.0018                                           
                               0.0173                                     
                                     0.0003                               
                                           0.9856                         
C        0.0141  0.0075  0.0098                                           
                               0.0105                                     
                                     0.0121                               
                                           0.0029                         
Fe       0.01    1.24    1.05  2.13  1.18  1.79                           
B        0.002   --      --    0.003 --    --                             
Zr       --      0.003   --    --    0.007 --                             
Ca       --      --      0.007 0.002 --    0.06                           
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 3                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  13      14      15    16    17    18                             
______________________________________                                    
Cr       20.6    21.0    20.0  18.7  15.2  24.8                           
Mo       22.1    21.3    19.7  23.8  23.6  17.9                           
Ta       2.08    2.21    2.03  1.15  1.88  2.05                           
N        0.0382  0.0415  0.0002                                           
                               0.0243                                     
                                     0.0305                               
                                           0.0412                         
Si       0.0714  0.0514  0.0873                                           
                               0.2982                                     
                                     0.0832                               
                                           0.0726                         
Mn       0.5216  0.4266  0.0025                                           
                               0.0139                                     
                                     0.0281                               
                                           2.9526                         
C        0.0014  0.0148  0.0083                                           
                               0.0027                                     
                                     0.0191                               
                                           0.0153                         
Fe       --      --      --    --    --    --                             
B        --      0.004   0.002 --    --    --                             
Zr       --      --      --    --    --    0.011                          
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 4                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  19      20      21    22    23    24                             
______________________________________                                    
Cr       28.8    25.6    20.4  15.6  32.8  27.8                           
Mo       14.1    14.3    14.2  14.6  10.1  10.0                           
Ta       4.12    4.23    4.52  4.78  6.03  6.22                           
N        0.0008  0.0551  0.0953                                           
                               0.0355                                     
                                     0.0521                               
                                           0.0148                         
Si       0.0528  0.0533  0.0216                                           
                               0.0038                                     
                                     0.1273                               
                                           0.0786                         
Mn       0.1726  0.8362  0.7261                                           
                               0.6836                                     
                                     0.5106                               
                                           0.2128                         
C        0.0091  0.2918  0.0732                                           
                               0.0150                                     
                                     0.0138                               
                                           0.0129                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       0.007   --      --    --    --    --                             
Ca       --      0.003   0.006 --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    0.14  0.22  --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 5                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  25      26      27    28    29    30                             
______________________________________                                    
Cr       20.6    15.8    34.4  30.0  25.3  19.9                           
Mo       10.1    10.4    6.3   6.2   6.4   6.1                            
Ta       6.23    6.88    7.52  7.66  7.82  7.93                           
N        0.0342  0.0368  0.0485                                           
                               0.0298                                     
                                     0.0412                               
                                           0.0511                         
Si       0.0732  0.0801  0.0656                                           
                               0.0521                                     
                                     0.0853                               
                                           0.0729                         
Mn       0.1126  0.0833  0.1928                                           
                               2.0215                                     
                                     0.3956                               
                                           0.3882                         
C        0.0138  0.0162  0.0231                                           
                               0.0339                                     
                                     0.0056                               
                                           0.0138                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 6                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  31      32      33    34    35    36                             
______________________________________                                    
Cr       15.4    19.2    17.2  18.8  21.7  22.5                           
Mo       6.4     19.1    18.3  18.2  18.1  17.8                           
Ta       7.75    1.91    2.49  2.11  2.91  3.07                           
N        0.0315  0.0265  0.0422                                           
                               0.0543                                     
                                     0.0186                               
                                           0.0312                         
Si       0.0886  0.0387  0.0116                                           
                               0.0083                                     
                                     0.0062                               
                                           0.0787                         
Mn       0.2565  0.2283  0.0391                                           
                               0.0598                                     
                                     0.7382                               
                                           0.0084                         
C        0.0072  0.0081  0.0115                                           
                               0.0101                                     
                                     0.0073                               
                                           0.0114                         
Fe       --      0.02    5.82  --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    0.14  0.92  --                             
W        --      --      --    --    --    0.17                           
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 7                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  37      38      39    40    41    42                             
______________________________________                                    
Cr       34.7    21.6    17.3  22.6  20.6  16.5                           
Mo       8.2     18.1    20.8  16.9  18.3  9.7                            
Ta       4.97    1.52    2.63  1.55  1.69  4.52                           
N        0.0006  0.0008  0.0185                                           
                               0.0215                                     
                                     0.0352                               
                                           0.0495                         
Si       0.0891  0.0935  0.0658                                           
                               0.0756                                     
                                     0.0328                               
                                           0.0051                         
Mn       0.6921  0.5918  0.2913                                           
                               0.1285                                     
                                     0.0562                               
                                           0.0836                         
C        0.0131  0.0093  0.0085                                           
                               0.0064                                     
                                     0.1183                               
                                           0.0143                         
Fe       --      0.02    5.82  --    0.25  --                             
B        --      --      --    0.084 --    --                             
Zr       --      --      --    --    0.091 --                             
Ca       --      --      --    --    --    0.008                          
Nb       --      --      --    0.16  0.38  0.26                           
W        3.88    --      --    --    2.29  3.21                           
Cu       --      0.12    3.94  1.15  --    2.22                           
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 8                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  43      44      45    46    47    48                             
______________________________________                                    
Cr       20.3    19.6    18.2  21.1  20.5  21.5                           
Mo       20.6    19.7    21.8  19.2  18.3  19.7                           
Ta       1.71    1.33    1.99  2.25  2.00  2.09                           
N        0.0522  0.0362  0.0048                                           
                               0.0162                                     
                                     0.0315                               
                                           0.0223                         
Si       0.0933  0.0526  0.0625                                           
                               0.0328                                     
                                     0.0362                               
                                           0.0413                         
Mn       0.4381  0.2795  0.0595                                           
                               0.0287                                     
                                     0.1316                               
                                           0.1425                         
C        0.0124  0.0078  1.0056                                           
                               0.0038                                     
                                     0.0127                               
                                           0.0062                         
Fe       --      --      --    --    0.04  --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    0.043 --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    0.52  --                             
Ti       0.06    0.78    --    --    0.09  --                             
Al       --       --     0.02  0.77  0.24  --                             
Co       --      --      --    --    --    0.14                           
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 9                                                     
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  49      50      51    52    53    54                             
______________________________________                                    
Cr       17.6    20.5    22.5  20.3  19.8  21.3                           
Mo       18.1    19.2    14.2  18.5  21.2  18.6                           
Ta       1.66    2.56    1.25  2.12  1.52  2.53                           
N        0.0245  0.0538  0.0342                                           
                               0.0391                                     
                                     0.0272                               
                                           0.0353                         
Si       0.0386  0.0278  0.0088                                           
                               0.0096                                     
                                     0.0121                               
                                           0.0235                         
Mn       0.8295  0.4365  0.0027                                           
                               0.0039                                     
                                     0.0021                               
                                           0.0285                         
C        0.0078  0.0114  0.0081                                           
                               0.0125                                     
                                     0.0112                               
                                           0.0087                         
Fe       --      --      --    1.25  --    --                             
B        --      --      --    0.009 --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    0.14  --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    0.34  --    --                             
Al       --      --      --    --    --    --                             
Co       4.83    --      --    2.03  --    --                             
V        --      0.12    0.47  0.13  --    --                             
Hf       --      --      --    --    0.15  1.93                           
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    --    --                             
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 10                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  55      56      57    58    59    60                             
______________________________________                                    
Cr       15.7    30.6    25.6  20.3  21.6  20.3                           
Mo       15.8    10.9    12.3  19.9  18.6  19.2                           
Ta       4.91    6.21    4.21  2.25  2.81  1.98                           
N        0.0432  0.0495  0.0814                                           
                               0.0515                                     
                                     0.0622                               
                                           0.0461                         
Si       0.0165  0.0238  0.0838                                           
                               0.0959                                     
                                     0.0287                               
                                           0.0742                         
Mn       0.1138  0.1925  0.8231                                           
                               0.4956                                     
                                     0.3692                               
                                           0.3815                         
C        0.0122  0.0145  0.0121                                           
                               0.0138                                     
                                     0.0129                               
                                           0.0081                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       0.02    2.96    --    --    --    --                             
Os, Pt   --      --      Os:0.02                                          
                               Os:1.93                                    
                                     Pt:0.02                              
                                           Pt:0.88                        
Pd, Ru   --      --      --    --    --    --                             
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 11                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  61      62      63    64    65    66                             
______________________________________                                    
Cr       20.6    17.9    21.9  19.6  22.5  18.8                           
Mo       20.3    16.8    18.3  17.2  18.1  17.3                           
Ta       1.15    3.27    2.55  3.86  1.75  3.58                           
N        0.0372  0.0288  0.0344                                           
                               0.0141                                     
                                     0.0292                               
                                           0.0233                         
Si       0.0555  0.0568  0.0090                                           
                               0.0832                                     
                                     0.0950                               
                                           0.0822                         
Mn       0.4362  0.2855  0.0291                                           
                               0.0036                                     
                                     0.0004                               
                                           0.0028                         
C        0.0079  0.0111  0.0027                                           
                               0.0104                                     
                                     0.0085                               
                                           0.0073                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Os, Pt   --      --      --    --    Os:0.57                              
                                           Pt:0.52                        
Pd, Ru   Ru:0.01 Ru:0.93 Pd:0.02                                          
                               Pd:0.89                                    
                                     Pd:0.21                              
                                           Ru:0.33                        
La, Ce, Y                                                                 
         --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 12                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  67      68      69    70    71    72                             
______________________________________                                    
Cr       32.1    22.8    20.6  21.7  17.3  20.5                           
Mo       8.3     11.9    20.0  20.1  17.1  17.5                           
Ta       5.26    4.15    2.11  2.06  2.15  1.22                           
N        0.0092  0.0121  0.0495                                           
                               0.0511                                     
                                     0.0150                               
                                           0.0183                         
Si       0.0826  0.0369  0.0425                                           
                               0.0516                                     
                                     0.0224                               
                                           0.0250                         
Mn       0.3253  0.4538  0.5256                                           
                               0.5461                                     
                                     0.3825                               
                                           0.3296                         
C        0.0053  0.0024  0.0038                                           
                               0.0126                                     
                                     0.0086                               
                                           0.0027                         
Fe       0.22    --      --    --    0.08  0.03                           
B        --      --      --    --    --    --                             
Zr       0.080   --      --    --    0.006 --                             
Ca       --      --      --    --    --    0.002                          
Nb       --      --      --    --    --    --                             
W        --      --      --    --    1.34  --                             
Cu       0.083   --      --    --    --    1.63                           
Ti       --      --      --    --    --    --                             
Al       0.10    --      --    --    0.04  0.02                           
Co       1.58    --      --    --    1.55  --                             
V        --      --      --    --    --    0.16                           
Hf       0.26    --      --    --    1.06  0.18                           
Re       0.04    --      --    --    --    1.53                           
Os, Pt   Pt:0.21 --      --    --    --    --                             
Pd, Ru   Ru:0.33 --      --    --    --    --                             
La, Ce, Y                                                                 
         --      La:0.05 Ce:0.04                                          
                               Y:0.06                                     
                                     --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: imp represents unavoidable impurities)                            
 
    
     
                       TABLE 13                                                    
______________________________________                                    
Comparative Ni-based alloy plates                                         
(unit: weight %)                                                          
element  1       2       3     4     5     6                              
______________________________________                                    
Cr       14.5*   35.4*   30.1  18.4  21.6  20.9                           
Mo       20.2    6.4     5.6*  24.3* 22.1  19.6                           
Cr + Mo  34.7    41.8    35.7  42.7  43.7* 40.5                           
Ta       3.26    6.97    2.96  1.28  2.25  0.98*                          
N        0.0211  0.0405  0.0422                                           
                               0.0365                                     
                                     0.0292                               
                                           0.0191                         
Si       0.0932  0.0825  0.0516                                           
                               0.0421                                     
                                     0.0386                               
                                           0.0392                         
Mn       0.2457  0.1653  0.4281                                           
                               0.3625                                     
                                     0.0292                               
                                           0.0573                         
C        0.0114  0.0087  0.0092                                           
                               0.0087                                     
                                     0.0071                               
                                           0.0088                         
Fe       0.19    0.07    0.09  1.27  --    2.31                           
B        0.007   --      --    --    --    0.008                          
Zr       --      0.009   --    --    --    --                             
Ca       --      --      0.002 --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 14                                                    
______________________________________                                    
Comparative Ni-based alloy plates                                         
(unit: weight %)                                                          
element  7       8       9     10    11    12                             
______________________________________                                    
Cr       19.3    20.1    20.3  21.5  19.1  19.4                           
Mo       15.7    22.7    19.8  21.2  20.8  21.0                           
Cr + Mo  34.9    42.9    40.1  42.7  39.9  40.4                           
Ta       8.33*   2.83    1.85  1.38  1.66  1.89                           
N        0.0275  --*     0.1156*                                          
                               0.0651                                     
                                     0.0361                               
                                           0.0351                         
Si       0.0275  0.0437  0.0420                                           
                               0.3243*                                    
                                     0.0735                               
                                           0.0551                         
Mn       0.0239  0.0128  0.5956                                           
                               0.9212                                     
                                     3.4526*                              
                                           0.1583                         
C        0.0136  0.0256  0.0467                                           
                               0.0097                                     
                                     0.0028                               
                                           0.3215*                        
Fe       --      --      0.81  --    --    --                             
B        --      --      0.006 --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Re       --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 15                                                    
______________________________________                                    
Comparative                                                               
Ni-based          Conventional Ni-                                        
alloy plates      based alloy plates                                      
element 13       14       1     2     3     4                             
______________________________________                                    
Cr      18.5     19.3     30.1  21.5  16.1  21.5                          
Mo      21.2     19.6     20.3  9.0   16.2  13.2                          
Cr + Mo 39.7     38.9     50.7  30.5  32.3  34.7                          
Ta      2.01     1.88     --    --    --    --                            
N       0.0426   0.0305   --    --    --    --                            
Si      0.0438   0.0485   --    --    --    --                            
Mn      0.2895   0.4255   --    --    --    --                            
C       0.0166   0.0028   --    --    --    --                            
Fe      6.32*    0.18     --    2.5    5.2  --                            
B       --       0.12*    --    --    --    --                            
Zr      --       --       --    --    --    --                            
Ca      --       --       --    --    --    --                            
Nb      --       --       --    3.7   --    --                            
W       --       --       --    --     3.2   3.2                          
Ni + imp                                                                  
        bal.     bal.     bal.  bal.  bal.  bal.                          
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 16                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        1      18.7       52.6    none  0.08                              
alloy plate                                                               
        2      18.9       53.7    none  0.09                              
of the  3      19.7       56.4    none  0.13                              
present 4      17.9       51.3    none  0.15                              
invention                                                                 
        5      18.6       53.8    none  0.17                              
        6      18.5       50.6    none  0.15                              
        7      18.9       50.9    none  0.14                              
        8      19.4       45.2    none  0.14                              
        9      18.3       51.2    none  0.15                              
        10     18.7       50.3    none  0.16                              
        11     18.6       49.2    none  0.14                              
        12     18.9       48.1    none  0.13                              
        13     19.2       49.5    none  0.13                              
        14     18.3       51.3    none  0.14                              
        15     18.7       53.1    none  0.18                              
        16     19.2       40.8    none  0.11                              
______________________________________                                    
 
    
     
                       TABLE 17                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        17     19.6       42.3    none  0.19                              
alloy plate                                                               
        18     17.5       58.7    none  0.13                              
of the  19     16.1       66.2    none  0.14                              
present 20     16.3       67.1    none  0.12                              
invention                                                                 
        21     16.2       65.1    none  0.15                              
        22     16.4       68.3    none  0.19                              
        23     16.8       57.2    none  0.16                              
        24     16.7       58.9    none  0.18                              
        25     16.5       68.2    none  0.17                              
        26     16.2       70.3    none  0.18                              
        27     17.8       56.9    none  0.18                              
        28     17.1       58.7    none  0.19                              
        29     16.1       69.1    none  0.18                              
        30     15.9       70.4    none  0.19                              
        31     15.8       73.2    none  0.19                              
        32     18.4       50.2    none  0.19                              
______________________________________                                    
 
    
     
                       TABLE 18                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        33     17.8       55.4    none  0.16                              
alloy plate                                                               
        34     17.9       53.9    none  0.18                              
of the  35     18.1       57.3    none  0.08                              
present 36     18.3       58.2    none  0.07                              
invention                                                                 
        37     16.7       56.6    non   0.15                              
        38     17.5       57.8    none  0.11                              
        39     18.4       56.7    none  0.12                              
        40     17.8       49.9    none  0.07                              
        41     17.9       47.3    none  0.08                              
        42     15.8       46.2    none  0.09                              
        43     18.8       61.2    none  0.18                              
        44     18.9       60.3    none  0.19                              
        45     18.3       62.2    none  0.15                              
        46     18.5       50.1    none  0.14                              
        47     17.8       56.2    none  0.18                              
        48     18.9       51.3    none  0.19                              
______________________________________                                    
 
    
     
                       TABLE 19                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        49     17.3       49.8    none  0.11                              
alloy plate                                                               
        50     18.9       50.7    none  0.12                              
of the  51     16.4       59.2    none  0.11                              
present 52     19.1       51.3    none  0.14                              
invention                                                                 
        53     19.5       48.2    none  0.15                              
        54     17.9       56.2    none  0.11                              
        55     16.4       63.3    none  0.19                              
        56     16.7       57.2    none  0.10                              
        57     15.8       64.1    none  0.18                              
        58     18.5       50.5    none  0.09                              
        59     18.8       51.2    none  0.07                              
        60     18.5       50.8    none  0.11                              
        61     18.6       50.2    none  0.10                              
        62     17.3       56.9    none  0.15                              
        63     17.9       54.3    none  0.11                              
        64     17.1       56.2    none  0.13                              
______________________________________                                    
 
    
     
                       TABLE 20                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        65     19.3       50.5    none  0.15                              
alloy plate                                                               
        66     19.1       50.3    none  0.15                              
of the  67     16.8       60.8    none  0.04                              
present 68     17.2       55.9    none  0.17                              
invention                                                                 
        69     18.9       49.5    none  0.11                              
        70     19.2       49.2    none  0.13                              
        71     16.8       62.9    none  0.14                              
        72     16.2       54.3    none  0.08                              
Compara-                                                                  
         1     15.2       67.3    present                                 
                                        0.26                              
tive     2     20.1       45.6    none  0.21                              
Ni-based                                                                  
         3     15.4       60.3    present                                 
                                        0.36                              
alloy    4     21.6       39.8    none  0.15                              
plates   5     22.7       38.5    none  0.13                              
         6     18.9       45.6    present                                 
                                        0.38                              
         7     21.9       39.6    none  0.18                              
         8     20.5       38.5    none  0.11                              
______________________________________                                    
 
    
     
                       TABLE 21                                                    
______________________________________                                    
         hot working workability                                          
                        anti-corrosion                                    
         deformation                                                      
                  elongation                                              
                            property                                      
           resistance up to           depth of                            
           under      rupture         crevice                             
           1100° C.                                                
                      under           corrosion                           
type       (kg/mm.sup.2)                                                  
                      800° C. (%)                                  
                                pitting                                   
                                      (mm)                                
______________________________________                                    
Compara-                                                                  
         9     22.9       20.5    none  0.18                              
tive    10     19.2       38.3    none  0.18                              
Ni-based                                                                  
        11     18.7       43.8    present                                 
                                        0.21                              
alloy   12     21.8       37.6    none  0.18                              
plate   13     17.7       55.7    present                                 
                                        0.22                              
        14     19.3       38.8    none  0.17                              
Conven-  1     29.8       8       none  0.02                              
tional   2     16.4       62      present                                 
                                        1.18                              
Ni-based                                                                  
         3     19.1       65      present                                 
                                        0.88                              
alloy    4     8.5        60      present                                 
                                        0.71                              
plate                                                                     
______________________________________                                    
 
    
     
                       TABLE 22                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  73      74      75    76    77    78                             
______________________________________                                    
Cr       17.1    21.8    19.8  21.6  18.2  19.5                           
Mo       21.6    20.1    20.0  18.1  22.9  19.8                           
Ta       1.94    1.83    2.20  2.22  1.28  1.21                           
N        0.0224  0.0326  0.0349                                           
                               0.0132                                     
                                     0.0085                               
                                           0.0054                         
Mg       0.0028  0.0226  0.0274                                           
                               0.0039                                     
                                     0.0028                               
                                           0.0141                         
Si       0.0427  0.0522  0.0586                                           
                               0.0422                                     
                                     0.0297                               
                                           0.0328                         
Mn       0.0143  0.2855  0.3050                                           
                               0.3218                                     
                                     0.2051                               
                                           0.2853                         
C        0.0139  0.0120  0.0044                                           
                               0.0098                                     
                                     0.0101                               
                                           0.0149                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 23                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  79      80      81    82    83    84                             
______________________________________                                    
Cr       20.2    18.4    19.3  20.2  21.4  20.7                           
Mo       19.6    22.2    21.4  20.1  19.6  18.4                           
Ta       3.47    2.05    2.08  2.19  2.38  1.97                           
N        0.0629  0.0018  0.0492                                           
                               0.0315                                     
                                     0.0121                               
                                           0.0092                         
Mg       0.0187  0.0098  0.0123                                           
                               0.0015                                     
                                     0.0294                               
                                           0.0103                         
Si       0.0625  0.0381  0.0349                                           
                               0.0203                                     
                                     0.0057                               
                                           0.0956                         
Mn       0.3926  0.0854  0.0458                                           
                               0.0488                                     
                                     0.1219                               
                                           0.1668                         
C        0.0075  0.0039  0.0053                                           
                               0.0187                                     
                                     0.0115                               
                                           0.0082                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 24                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  85      86      87    88    89    90                             
______________________________________                                    
Cr       17.9    18.4    15.2  34.8  23.7  16.3                           
Mo       21.0    19.7    20.4  7.6   6.1   24.8                           
Ta       2.34    2.85    3.82  6.65  7.83  1.14                           
N        0.0086  0.0053  0.0244                                           
                               0.0181                                     
                                     0.0293                               
                                           0.0359                         
Mg       0.0164  0.0243  0.0114                                           
                               0.0205                                     
                                     0.0224                               
                                           0.0138                         
Si       0.0984  0.0055  0.0427                                           
                               0.0834                                     
                                     0.0856                               
                                           0.0427                         
Mn       0.4943  0.2734  0.3725                                           
                               0.4292                                     
                                     0.2256                               
                                           0.0281                         
C        0.0128  0.0193  0.0083                                           
                               0.0112                                     
                                     0.0072                               
                                           0.0154                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 25                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  91      92      93    94    95    96                             
______________________________________                                    
Cr       19.6    18.3    19.2  17.6  21.1  20.8                           
Mo       21.8    20.5    20.8  21.2  19.5  19.4                           
Ta       1.12    7.93    1.93  1.55  2.12  2.03                           
N        0.0471  0.0032  0.0005                                           
                               0.0462                                     
                                     0.0338                               
                                           0.0485                         
Mg       0.0090  0.0291  0.0118                                           
                               0.0072                                     
                                     0.0006                               
                                           0.2954                         
Si       0.0489  0.0225  0.0743                                           
                               0.0376                                     
                                     0.0155                               
                                           0.0091                         
Mn       0.3521  0.0385  0.0135                                           
                               0.0372                                     
                                     0.0927                               
                                           0.1387                         
C        0.0121  0.0098  0.0105                                           
                               0.0167                                     
                                     0.0044                               
                                           0.0063                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 26                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  97      98      99    100   101   102                            
______________________________________                                    
Cr       20.4    19.9    18.3  19.6  19.6  19.7                           
Mo       19.1    20.8    21.2  21.4  18.5  20.1                           
Ta       1.80    1.84    2.09  2.20  1.87  2.02                           
N        0.0230  0.0054  0.0119                                           
                               0.0251                                     
                                     0.0285                               
                                           0.0309                         
Mg       0.0132  0.0105  0.0239                                           
                               0.0281                                     
                                     0.0103                               
                                           0.0029                         
Si       0.2934  0.0562  0.0442                                           
                               0.0276                                     
                                     0.0832                               
                                           0.0726                         
Mn       0.2895  2.9862  0.1382                                           
                               0.0835                                     
                                     0.4255                               
                                           0.3463                         
C        0.0129  0.0147  0.0988                                           
                               0.0049                                     
                                     0.0187                               
                                           0.0105                         
Fe       --      --      --    --    5.85  --                             
B        --      --      --    --    --    0.0974                         
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 27                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  103     104     105   106   107   108                            
______________________________________                                    
Cr       19.8    19.7    19.8  20.2  19.9  20.1                           
Mo       19.2    20.5    20.3  19.7  20.4  19.2                           
Ta       1.84    1.76    2.04  1.93  1.82  2.25                           
N        0.0178  0.0315  0.0051                                           
                               0.0188                                     
                                     0.0276                               
                                           0.0242                         
Mg       0.0045  0.0073  0.0185                                           
                               0.0270                                     
                                     0.0139                               
                                           0.0273                         
Si       0.0358  0.0379  0.0147                                           
                               0.0088                                     
                                     0.0093                               
                                           0.0147                         
Mn       0.0295  0.0133  0.0058                                           
                               0.0295                                     
                                     0.1395                               
                                           0.3526                         
C        0.0129  0.0182  0.0027                                           
                               0.0091                                     
                                     0.0105                               
                                           0.0134                         
Fe       --      --      0.02  0.58  0.84  --                             
B        --      --      0.0017                                           
                               --    --    0.0275                         
Zr       --      0.0982  --    --    0.0085                               
                                           --                             
Ca       0.0094  --      --    0.0015                                     
                                     --    0.0032                         
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 28                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  109     110     111   112   113   114                            
______________________________________                                    
Cr       20.4    19.6    19.8  20.0  20.2  20.3                           
Mo       20.3    19.4    20.2  20.3  19.7  20.8                           
Ta       2.09    2.11    1.89  1.73  1.85  2.29                           
N        0.0276  0.0130  0.0240                                           
                               0.0284                                     
                                     0.0225                               
                                           0.0134                         
Mg       0.0198  0.0115  0.0218                                           
                               0.0244                                     
                                     0.0175                               
                                           0.0127                         
Si       0.0285  0.0635  0.0678                                           
                               0.0556                                     
                                     0.0398                               
                                           0.0275                         
Mn       0.4566  0.0288  0.0125                                           
                               0.0259                                     
                                     0.0105                               
                                           0.0224                         
C        0.0116  0.0198  0.0155                                           
                               0.0120                                     
                                     0.0177                               
                                           0.0181                         
Fe       --      --      1.52  2.24  1.54  --                             
B        0.0342  --      0.0074                                           
                               --    0.0135                               
                                           0.0042                         
Zr       0.0127  0.0088  --    0.0143                                     
                                     0.0192                               
                                           0.0083                         
Ca       --      0.0045  0.0027                                           
                               0.0035                                     
                                     --    0.0055                         
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 29                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  115     116     117   118   119   120                            
______________________________________                                    
Cr       19.3    19.2    19.8  20.2  21.0  20.5                           
Mo       20.7    17.2    16.5  16.3  18.4  20.8                           
Ta       1.75    1.83    2.92  2.38  2.26  1.89                           
N        0.0172  0.0155  0.0184                                           
                               0.0247                                     
                                     0.0154                               
                                           0.0133                         
Mg       0.0152  0.0246  0.0084                                           
                               0.0052                                     
                                     0.0138                               
                                           0.0201                         
Si       0.0752  0.0621  0.0373                                           
                               0.0262                                     
                                     0.0054                               
                                           0.0213                         
Mn       0.3564  0.0293  0.0180                                           
                               0.1724                                     
                                     0.0838                               
                                           0.0732                         
C        0.0119  0.0077  1.0082                                           
                               0.0173                                     
                                     0.0166                               
                                           0.0180                         
Fe       0.01    --      --    --    --    0.08                           
B        0.0015  --      --    --    --    --                             
Zr       0.0013  --      --    --    --    --                             
Ca       0.0014  --      --    --    --    --                             
Nb       --      0.92    --    --    --    0.13                           
W        --      --      3.95  --    --    0.14                           
Cu       --      --      --    3.92  --    --                             
Hf       --      --      --    --    1.96  --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 30                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  121     122     123   124   125   126                            
______________________________________                                    
Cr       20.8    19.9    19.6  19.7  20.1  20.2                           
Mo       19.2    20.3    19.5  20.9  19.7  19.8                           
Ta       1.94    1.99    1.87  2.15  2.27  2.09                           
N        0.0208  0.0421  0.0270                                           
                               0.0332                                     
                                     0.0309                               
                                           0.0394                         
Mg       0.0155  0.0287  0.0098                                           
                               0.0139                                     
                                     0.0162                               
                                           0.0130                         
Si       0.0356  0.0511  0.0435                                           
                               0.0048                                     
                                     0.0019                               
                                           0.0209                         
Mn       0.1518  0.2360  0.1829                                           
                               0.0327                                     
                                     0.0225                               
                                           0.0138                         
C        0.0077  0.0098  0.0085                                           
                               0.0191                                     
                                     0.0148                               
                                           0.0092                         
Fe       --      --      --    --    --    --                             
B        0.0045  --      --    --    --    --                             
Zr       --      --      0.0038                                           
                               --    --    --                             
Ca       --      0.0022  --    --    --    --                             
Nb       --      --      0.19  --    --    --                             
W        0.12    --      --    --    --    --                             
Cu       0.11    0.28    --    --    --    --                             
Hf       --      0.35    0.14  --    --    --                             
Ti       --      --      --    0.77  --    --                             
Al       --      --      --    --    0.78  --                             
Co       --      --      --    --    --    4.95                           
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 31                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  127     128     129   130   131   132                            
______________________________________                                    
Cr       19.7    20.8    20.2  20.5  20.3  19.2                           
Mo       20.5    20.4    20.5  20.8  20.6  19.5                           
Ta       2.10    1.85    1.93  1.79  2.06  1.80                           
N        0.0135  0.0170  0.0024                                           
                               0.0054                                     
                                     0.0088                               
                                           0.0125                         
Mg       0.0165  0.0129  0.0223                                           
                               0.0256                                     
                                     0.0145                               
                                           0.0236                         
Si       0.0156  0.0024  0.0557                                           
                               0.0438                                     
                                     0.0296                               
                                           0.0210                         
Mn       0.0927  0.4238  0.4325                                           
                               0.3863                                     
                                     0.0284                               
                                           0.0363                         
C        0.0083  0.0125  0.0115                                           
                               0.0104                                     
                                     0.0080                               
                                           0.0106                         
Fe       --      0.92    --    --    --    2.25                           
B        --      --      0.0041                                           
                               --    --    --                             
Zr       --      --      --    --    0.0033                               
                                           --                             
Ca       --      --      --    0.0027                                     
                                     --    --                             
Nb       --      0.25    --    --    --    0.19                           
W        --      --      0.45  --    --    --                             
Cu       --      --      --    0.33  --    --                             
Hf       --      --      --    --    0.28  --                             
Ti       --      0.06    --    --    0.09  --                             
Al       --      0.02    0.04  --    --    --                             
Co       --      --      0.13  0.29  --    --                             
V        0.48    --      --    0.12  0.18  --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 32                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  133     134     135   136   137   138                            
______________________________________                                    
Cr       17.9    18.2    18.4  19.6  19.5  18.7                           
Mo       18.6    18.9    19.1  19.3  18.4  18.2                           
Ta       1.81    1.34    2.03  2.22  2.56  2.18                           
N        0.0018  0.0078  0.0173                                           
                               0.0215                                     
                                     0.0089                               
                                           0.0110                         
Mg       0.0015  0.0132  0.0161                                           
                               0.0213                                     
                                     0.0085                               
                                           0.0155                         
Si       0.0832  0.0775  0.0655                                           
                               0.0542                                     
                                     0.0331                               
                                           0.0448                         
Mn       0.1283  0.0835  0.0721                                           
                               0.0085                                     
                                     0.0134                               
                                           0.0155                         
C        0.0133  0.0029  0.0018                                           
                               0.0052                                     
                                     0.0043                               
                                           0.0085                         
Fe       0.85    0.62    1.15  1.28  1.33  1.49                           
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        1.23    --      --    --    --    --                             
Cu       --      1.55    --    --    --    --                             
Hf       --      --      0.82  --    --    --                             
Ti       --      --      --    0.14  --    --                             
Al       --      --      --    --    0.18  --                             
Co       --      --      --    --    --    0.56                           
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 33                                                    
______________________________________                                    
Ni-based alloy plate of the present invention                             
(unit: weight %)                                                          
element  139     140     141   142   143   144                            
______________________________________                                    
Cr       18.9    17.7    18.3  18.5  18.7  19.2                           
Mo       19.5    20.2    19.1  20.3  20.6  20.0                           
Ta       1.43    1.55    1.78  1.95  1.28  1.46                           
N        0.0028  0.0133  0.0115                                           
                               0.0092                                     
                                     0.0456                               
                                           0.0359                         
Mg       0.0225  0.0181  0.0235                                           
                               0.0080                                     
                                     0.0077                               
                                           0.0119                         
Si       0.0820  0.0735  0.0098                                           
                               0.0332                                     
                                     0.0611                               
                                           0.0090                         
Mn       0.1443  0.0826  0.2234                                           
                               0.0186                                     
                                     0.0732                               
                                           0.0563                         
C        0.0131  0.0029  0.0086                                           
                               0.0112                                     
                                     0.0073                               
                                           0.0042                         
Fe       1.25    2.56    2.48  --    --    0.02                           
B        --      --      --    --    --    0.002                          
Zr       --      --      --    --    --    0.002                          
Ca       --      --      --    --    --    0.001                          
Nb       --      --      0.26  --    --    0.11                           
W        --      --      0.43  --    --    0.14                           
Cu       --      --      0.55  0.88  --    0.11                           
Hf       --      --      0.26  0.31  0.28  0.12                           
Ti       --      0.13    --    --    0.11  0.07                           
Al       --      0.06    --    --    --    0.02                           
Co       --      0.9     --    --    0.25  0.13                           
V        0.18    0.21    --    0.12  --    0.11                           
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities.)                         
 
    
     
                       TABLE 34                                                    
______________________________________                                    
Comparative Ni-based alloy plates                                         
(unit: weight %)                                                          
element  15      16      17    18    19    20                             
______________________________________                                    
Cr       14.5*   35.6*   29.8  17.4  20.1  19.8                           
Mo       20.1    6.3     5.4*  25.6* 19.7  15.4                           
Ta       3.30    6.82    3.03  1.31  0.91* 8.52*                          
N        0.0255  0.0356  0.0428                                           
                               0.0283                                     
                                     0.0193                               
                                           0.0354                         
Mg       0.0785  0.0246  0.0180                                           
                               0.0058                                     
                                     0.0173                               
                                           0.0059                         
Si       0.0804  0.0529  0.0618                                           
                               0.0742                                     
                                     0.0121                               
                                           0.0388                         
Mn       0.2881  0.1825  0.3935                                           
                               0.4351                                     
                                     0.0565                               
                                           0.0745                         
C        0.0105  0.0098  0.0125                                           
                               0.0143                                     
                                     0.0044                               
                                           0.0075                         
Fe       --      --      --    --    --    --                             
B        --      --      --    --    --    --                             
Zr       --      --      --    --    --    --                             
Ca       --      --      --    --    --    --                             
Nb       --      --      --    --    --    --                             
W        --      --      --    --    --    --                             
Cu       --      --      --    --    --    --                             
Hf       --      --      --    --    --    --                             
Ti       --      --      --    --    --    --                             
Al       --      --      --    --    --    --                             
Co       --      --      --    --    --    --                             
V        --      --      --    --    --    --                             
Ni + imp bal.    bal.    bal.  bal.  bal.  bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 35                                                    
______________________________________                                    
Comparative Ni-based alloy plates                                         
(unit: weight %)                                                          
element 21       22       23     24     25                                
______________________________________                                    
Cr      20.4     20.7     20.5   21.5   19.2                              
Mo      22.3     19.6     21.1   21.2   20.7                              
Ta      2.88     1.95     2.59   1.38   1.73                              
N        --*     0.12*    0.0557 0.0651 0.0365                            
Mg      0.0225   0.0170   0.33*  0.0295 0.0145                            
Si      0.0225   0.0595   0.0146 0.32*  0.0733                            
Mn      0.0384   0.2765   0.4829 0.8356 3.25*                             
C       0.0144   0.0049   0.0159 0.0079 0.0028                            
Fe      --       --       --     --     --                                
B       --       --       --     --     --                                
Zr      --       --       --     --     --                                
Ca      --       --       --     --     --                                
Nb      --       --       --     --     --                                
W       --       --       --     --     --                                
Cu      --       --       --     --     --                                
Hf      --       --       --     --     --                                
Ti      --       --       --     --     --                                
Al      --       --       --     --     --                                
Co      --       --       --     --     --                                
V       --       --       --     --     --                                
Ni + imp                                                                  
        bal.     bal.     bal.   bal.   bal.                              
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 36                                                    
______________________________________                                    
       Comparative                                                        
       Ni-based    Conventional Ni-                                       
       alloy plates                                                       
                   based alloy plates                                     
element  26       27       1    2     3    4                              
______________________________________                                    
Cr       19.8     19.3     30.1 21.5  16.1 21.5                           
Mo       20.8     19.6     20.3 9.0   16.2 13.2                           
Ta       1.88     1.87     --   --    --   --                             
N        0.0352   0.0305   --   --    --   --                             
Mg       0.0145   0.0177   --   --    --   --                             
Si       0.0829   0.0485   --   --    --   --                             
Mn       0.1411   0.4255   --   --    --   --                             
C        0.1105*  0.0028   --   --    --   --                             
Fe       --       6.33*    --   2.5    5.2 --                             
B        --       --       --   --    --   --                             
Zr       --       --       --   --    --   --                             
Ca       --       --       --   --    --   --                             
Nb       --       --       --   3.7   --   --                             
W        --       --       --   --     3.2  3.2                           
Ni +  imp                                                                 
         bal.     bal.     bal. bal.  bal. bal.                           
______________________________________                                    
 (Note: &#34;imp&#34; represents unavoidable impurities, and the values with an * 
 are out of the range of the present invention.)                          
 
    
     
                       TABLE 37                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
        73    18.6       54.8     none  0.08                              
alloy plate                                                               
        74    18.4       51.6     none  0.07                              
of the  75    19.2       48.6     none  0.09                              
present 76    18.3       49.2     none  0.11                              
invention                                                                 
        77    18.2       50.5     none  0.12                              
        78    19.4       50.3     none  0.10                              
        79    19.0       49.5     none  0.14                              
        80    18.8       48.2     none  0.14                              
        81    18.9       52.5     none  0.12                              
        82    19.1       51.1     none  0.14                              
        83    18.8       50.2     none  0.10                              
        84    19.2       51.3     none  0.11                              
        85    19.8       50.9     none  0.09                              
        86    19.4       49.6     none  0.10                              
        87    18.8       52.6     none  0.17                              
        88    18.0       58.1     none  0.18                              
______________________________________                                    
 
    
     
                       TABLE 38                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
       89     18.4       55.4     none  0.16                              
alloy  90     19.1       44.2     none  0.14                              
plate  91     18.3       50.8     none  0.13                              
of the 92     18.5       43.6     none  0.15                              
present                                                                   
       93     19.3       51.2     none  0.18                              
invention                                                                 
       94     19.0       50.0     none  0.16                              
       95     18.5       49.7     none  0.17                              
       96     19.4       52.3     none  0.17                              
       97     18.6       49.1     none  0.18                              
       98     18.1       48.7     none  0.18                              
       99     18.6       44.2     none  0.19                              
       100    18.5       52.6     none  0.13                              
       101    18.5       52.1     none  0.16                              
       102    18.4       50.6     none  0.15                              
       103    19.2       50.9     none  0.17                              
       104    18.6       49.8     none  0.15                              
______________________________________                                    
 
    
     
                       TABLE 39                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
       105    19.9       52.9     none  0.18                              
alloy  106    18.1       51.1     none  0.13                              
plate  107    18.4       52.5     none  0.18                              
of the 108    18.4       51.3     none  0.17                              
present                                                                   
       109    18.7       50.4     none  0.16                              
invention                                                                 
       110    19.4       52.3     none  0.17                              
       111    18.5       51.8     none  0.16                              
       112    18.0       49.5     none  0.16                              
       113    18.4       49.6     none  0.17                              
       114    18.9       48.8     none  0.18                              
       115    18.8       52.5     none  0.19                              
       116    18.2       48.8     none  0.18                              
       117    18.6       46.7     none  0.16                              
       118    19.2       46.5     none  0.17                              
       119    19.4       49.2     none  0.16                              
       120    19.0       48.8     none  0.16                              
______________________________________                                    
 
    
     
                       TABLE 40                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
       121    19.6       47.2     none  0.18                              
alloy  122    19.4       48.1     none  0.14                              
plate  123    19.2       48.2     none  0.16                              
of the 124    19.8       49.5     none  0.17                              
present                                                                   
       125    19.5       50.1     none  0.18                              
invention                                                                 
       126    19.5       44.5     none  0.15                              
       127    19.0       52.1     none  0.14                              
       128    18.9       50.3     none  0.16                              
       129    19.6       48.8     none  0.15                              
       130    19.8       46.5     none  0.14                              
       131    19.7       48.2     none  0.16                              
       132    18.8       44.6     none  0.15                              
       133    18.5       50.2     none  0.14                              
       134    18.6       50.1     none  0.14                              
       135    19.1       49.3     none  0.15                              
       136    19.3       48.1     none  0.13                              
______________________________________                                    
 
    
     
                       TABLE 41                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Ni-based                                                                  
       137    19.5       51.6     none  0.16                              
alloy  138    19.6       52.1     none  0.17                              
plate  139    19.3       51.0     none  0.15                              
of the 140    19.2       49.8     none  0.15                              
present                                                                   
       141    18.1       50.6     none  0.14                              
invention                                                                 
       142    19.9       51.3     none  0.14                              
       143    18.5       50.1     none  0.13                              
       144    18.7       50.9     none  0.12                              
Compar-                                                                   
       15     15.2       67.3     present                                 
                                        0.26                              
ative  16     20.2       45.8     none  0.21                              
Ni-based                                                                  
       17     15.4       60.3     present                                 
                                        0.37                              
alloy  18     broken     --       --    --                                
plate         during                                                      
              rolling                                                     
       19     18.9       45.6     present                                 
                                        0.38                              
       20     21.9       38.8     none  0.13                              
       21     20.5       38.4     none  0.11                              
       22     22.8       20.2     present                                 
                                        0.18                              
______________________________________                                    
 
    
     
                       TABLE 42                                                    
______________________________________                                    
        hot working workability                                           
                        anti-corrosion                                    
        deformation                                                       
                 elongation property                                      
          resistance up to            depth of                            
          under      rupture          crevice                             
          1100° C.                                                 
                     under 800° C.                                 
                                      corrosion                           
type      (kg/mm.sup.2)                                                   
                     (%)        pitting                                   
                                      (mm)                                
______________________________________                                    
Compara-                                                                  
        23    broken     --       --    --                                
tive          during                                                      
Ni-based      rolling                                                     
alloy plate                                                               
        24    19.2       38.3     none  0.18                              
        25    18.7       43.8     present                                 
                                        0.25                              
        26    21.8       37.4     none  0.18                              
        27    18.6       38.9     present                                 
                                        0.21                              
Conven- 1     29.8       8        none  0.02                              
tional  2     16.4       62       present                                 
                                        1.18                              
Ni-based                                                                  
        3     19.1       65       present                                 
                                        0.88                              
alloy plate                                                               
        4     18.5       60       present                                 
                                        0.21                              
______________________________________                                    
 
    
     
                                           TABLE 43                                
__________________________________________________________________________
         composition (weight %)                          crack            
         (remaining portion: Ni and unavoidable impurities)               
                                                         during hot       
type     Cr  Mo Ta  Fe Zr  B  Nb  W  Cu  Cr + Mo                          
                                               [4Nb + W                   
                                                         working          
__________________________________________________________________________
Ni-based                                                                  
      145                                                                 
         17.5                                                             
             21.3                                                         
                1.68                                                      
                    0.43                                                  
                       --  -- --  -- --  38.8  --        none             
alloy plate                                                               
      146                                                                 
         18.1                                                             
             23.4                                                         
                1.04                                                      
                    0.87                                                  
                       --  -- --  -- --  41.5  --                         
of the                                                                    
      147                                                                 
         19.6                                                             
             20.8                                                         
                1.84                                                      
                    0.03                                                  
                       --  -- --  -- --  40.4  --                         
present                                                                   
      148                                                                 
         18.8                                                             
             21.2                                                         
                2.21                                                      
                    3.33                                                  
                       --  -- --  -- --  40.0  --                         
invention                                                                 
      149                                                                 
         19.2                                                             
             23.6                                                         
                1.64                                                      
                    0.85                                                  
                       0.003                                              
                           -- --  -- --  42.8  --                         
      150                                                                 
         20.2                                                             
             22.6                                                         
                2.02                                                      
                    1.89                                                  
                       0.004                                              
                           -- --  -- --  42.8  --                         
      151                                                                 
         19.5                                                             
             22.9                                                         
                2.98                                                      
                    0.05                                                  
                       --  0.002                                          
                              --  -- --  42.4  --                         
      152                                                                 
         20.8                                                             
             21.2                                                         
                1.85                                                      
                    3.82                                                  
                       --  0.005                                          
                              --  -- --  42.0  --                         
      153                                                                 
         20.6                                                             
             22.3                                                         
                1.42                                                      
                    0.02                                                  
                       --  0.005                                          
                              0.13                                        
                                  -- --  42.9  0.52                       
      154                                                                 
         21.3                                                             
             21.1                                                         
                3.49                                                      
                    0.56                                                  
                       --  0.005                                          
                              0.39                                        
                                  0.18                                    
                                     0.20                                 
                                         42.4  1.94                       
__________________________________________________________________________
 
    
     
                                           TABLE 44                                
__________________________________________________________________________
         composition (weight %)                          crack            
         (remaining portion: Ni and unavoidable impurities)               
                                                         during hot       
type     Cr  Mo Ta  Fe Zr  B  Nb  W  Cu  Cr + Mo                          
                                               [4Nb + W                   
                                                         working          
__________________________________________________________________________
Ni-based                                                                  
      155                                                                 
         19.3                                                             
             19.1                                                         
                3.32                                                      
                    0.05                                                  
                       0.005                                              
                           -- --  -- --  38.4  --        none             
alloy plate                                                               
      156                                                                 
         21.5                                                             
             19.6                                                         
                1.55                                                      
                    2.18                                                  
                       --  0.005                                          
                              --  -- 1.88                                 
                                         41.1  1.88                       
of the                                                                    
      157                                                                 
         20.4                                                             
             20.1                                                         
                2.01                                                      
                    0.13                                                  
                       0.005                                              
                           -- 0.18                                        
                                  -- --  40.5  0.72                       
present                                                                   
      158                                                                 
         17.1                                                             
             21.2                                                         
                2.35                                                      
                    0.85                                                  
                       0.003                                              
                           0.005                                          
                              --  1.24                                    
                                     --  38.3  1.24                       
invention                                                                 
      159                                                                 
         20.2                                                             
             20.1                                                         
                1.16                                                      
                    3.75                                                  
                       0.008                                              
                           -- --  0.5                                     
                                     --  40.3  0.5                        
      160                                                                 
         21.5                                                             
             20.8                                                         
                2.84                                                      
                    2.53                                                  
                       --  0.007                                          
                              --  0.34                                    
                                     --  42.3  0.34                       
      161                                                                 
         18.9                                                             
             23.7                                                         
                1.81                                                      
                    0.55                                                  
                       0.005                                              
                           0.005                                          
                              --  -- 1.02                                 
                                         42.6  1.02                       
      162                                                                 
         19.5                                                             
             21.5                                                         
                1.14                                                      
                    0.06                                                  
                       0.005                                              
                           -- 0.3 -- --  41.0  1.2                        
      163                                                                 
         20.3                                                             
             19.4                                                         
                1.59                                                      
                    0.08                                                  
                       --  0.004                                          
                              --  1.5                                     
                                     --  39.7  1.5                        
      164                                                                 
         21.6                                                             
             22.1                                                         
                1.89                                                      
                    1.25                                                  
                       0.005                                              
                           -- --  -- 0.20                                 
                                         43.7  0.2                        
      165                                                                 
         19.8                                                             
             20.4                                                         
                1.26                                                      
                    0.07                                                  
                       --  0.006                                          
                              0.15                                        
                                  1.22                                    
                                     --  40.2  1.82                       
      166                                                                 
         20.1                                                             
             20.3                                                         
                1.31                                                      
                    0.05                                                  
                       --  0.005                                          
                              0.27                                        
                                  -- 0.76                                 
                                         40.4  1.84                       
      167                                                                 
         20.2                                                             
             19.7                                                         
                1.35                                                      
                    0.08                                                  
                       0.007                                              
                           0.002                                          
                              --  1.23                                    
                                     0.55                                 
                                         39.9  1.78                       
__________________________________________________________________________
 
    
     
                                           TABLE 45                                
__________________________________________________________________________
         composition (weight %)                          crack            
         (remaining portion: Ni and unavoidable impurities)               
                                                         during hot       
type     Cr  Mo  Ta Fe  Zr  B   Nb W  Cu Cr + Mo                          
                                               [4Nb + W                   
                                                         working          
__________________________________________________________________________
Comparative                                                               
       28                                                                 
         22.9*                                                            
             23.1                                                         
                 2.08                                                     
                    0.03                                                  
                        --  0.005                                         
                                -- -- -- 46.0* --        present          
Ni-based                                                                  
       29                                                                 
         16.2*                                                            
             22.2                                                         
                 1.87                                                     
                    0.05                                                  
                        0.004                                             
                            --  -- -- -- 38.4  --        none             
alloy plate                                                               
       30                                                                 
         18.4                                                             
             25.5*                                                        
                 1.89                                                     
                    1.22                                                  
                        --  0.003                                         
                                -- -- -- 43.9  --        present          
       31                                                                 
         19.8                                                             
             18.3*                                                        
                 1.34                                                     
                    0.84                                                  
                        --  --  0.12                                      
                                   -- -- 38.1  0.48      none             
       32                                                                 
         18.9                                                             
             21.9                                                         
                 4.0*                                                     
                    0.03                                                  
                        --  --  -- -- -- 40.8  --        present          
       33                                                                 
         18.8                                                             
             21.6                                                         
                 0.5*                                                     
                    0.06                                                  
                        --  --  -- -- -- 40.4  --        none             
       34                                                                 
         19.7                                                             
             20.1                                                         
                 2.67                                                     
                    0.005*                                                
                        --  --  -- -- -- 39.8  --        present          
       35                                                                 
         18.6                                                             
             22.1                                                         
                 1.27                                                     
                    4.5*                                                  
                        --  --  -- -- -- 40.7  --        none             
       36                                                                 
         21.3                                                             
             21.2                                                         
                 3.33                                                     
                    0.89                                                  
                         0.015*                                           
                            --  -- -- -- 42.5  --        present          
       37                                                                 
         19.1                                                             
             20.9                                                         
                 2.19                                                     
                    0.04                                                  
                        --   0.015*                                       
                                -- -- -- 40.0  --        present          
__________________________________________________________________________
 (Note: The values with an * are out of the range of the invention or     
 preferred range.)                                                        
 
    
     
                                           TABLE 46                                
__________________________________________________________________________
         composition (weight %)                          crack            
         (remaining portion: Ni and unavoidable impurities)               
                                                         during hot       
type     Cr  Mo Ta  Fe Zr  B  Nb  W  Cu  Cr + Mo                          
                                               [4Nb + W                   
                                                         working          
__________________________________________________________________________
Comparative                                                               
       38                                                                 
         20.5                                                             
             19.4                                                         
                1.20                                                      
                    0.09                                                  
                       0.005                                              
                           -- 0.6*                                        
                                  -- --  39.9  2.4*      present          
Ni-based                                                                  
       39                                                                 
         19.6                                                             
             19.1                                                         
                1.13                                                      
                    0.05                                                  
                       --  0.005                                          
                              --  2.5*                                    
                                     --  38.7  2.5*      present          
alloy plate                                                               
       40                                                                 
         18.3                                                             
             22.1                                                         
                2.23                                                      
                    0.37                                                  
                       0.005                                              
                           -- --  -- 2.5*                                 
                                         40.4  2.5*      present          
       41                                                                 
         21.8                                                             
             23.4                                                         
                3.08                                                      
                    0.03                                                  
                       --  -- --  -- --  45.2* --        present          
       42                                                                 
         17.6                                                             
             19.5                                                         
                1.87                                                      
                    0.11                                                  
                       --  -- --  -- --  37.1* --        present          
       43                                                                 
         20.3                                                             
             19.7                                                         
                1.51                                                      
                    0.14                                                  
                       --  -- 0.3 0.5                                     
                                     0.5 40.0  2.2*      present          
Conven-                                                                   
       5 21.5                                                             
             13.2                                                         
                --  4.11                                                  
                       --  -- --  3.03                                    
                                     --  33.8  3.3       none             
tional 6 30.3                                                             
             5.14                                                         
                0.21                                                      
                    15.1                                                  
                       --  -- 0.52                                        
                                  2.53                                    
                                     --  35.44 4.61      none             
Ni-based                                                                  
       7 8.4 25.2                                                         
                --  1.62                                                  
                       --  -- --  -- --  33.6  --        none             
alloy plate                                                               
       8 --  28.1                                                         
                --  1.95                                                  
                       --  -- --  -- --  28.1  --        none             
       9 30.4                                                             
             19.6                                                         
                --  -- --  -- --  -- --  50.0  --        present          
__________________________________________________________________________
 (Note: The values with an * are out of the range of the invention or     
 preferred range.)                                                        
 
    
     
                                           TABLE 47                                
__________________________________________________________________________
          corrosion speed by soaking in sulfuric acid liquid              
          (mm/year)                                                       
                        60% H.sub.2 SO.sub.4                              
                              80% H.sub.2 SO.sub.4                        
                        with active                                       
                              with active                                 
                                     60% H.sub.2 SO.sub.4                 
                                             60% H.sub.2 SO.sub.4         
                                                      60% H.sub.2         
                                                      SO.sub.4 +          
type      60% H.sub.2 SO.sub.4                                            
                 80% H.sub.2 SO.sub.4                                     
                        carbon                                            
                              carbon 100 ppm HCl                          
                                             10 ppm HNO.sub.3             
                                                      400 ppm             
__________________________________________________________________________
                                                      Fe.sup.3+           
Ni-based                                                                  
       145                                                                
          0.07   0.08   0.64  0.86   0.12    0.156    0.280               
alloy plate                                                               
       146                                                                
          0.04   0.10   0.89  0.92   0.06    0.122    0.255               
of the 147                                                                
          0.19   0.38   0.43  0.54   0.23    0.304    0.539               
present                                                                   
       148                                                                
          0.24   0.15   0.69  0.52   0.29    0.462    0.635               
invention                                                                 
       149                                                                
          0.09   0.16   0.85  0.83   0.16    0.205    0.725               
       150                                                                
          0.13   0.21   0.94  0.91   0.18    0.311    0.413               
       151                                                                
          0.15   0.74   0.22  0.68   0.21    0.434    0.487               
       152                                                                
          0.16   0.23   0.40  0.49   0.22    0.355    0.459               
       153                                                                
          0.06   0.24   0.59  0.87   0.11    0.172    0.576               
       154                                                                
          0.07   0.08   0.36  0.73   0.15    0.195    0.225               
__________________________________________________________________________
 
    
     
                                           TABLE 48                                
__________________________________________________________________________
          corrosion speed by soaking in sulfuric acid liquid              
          (mm/year)                                                       
                        60% H.sub.2 SO.sub.4                              
                              80% H.sub.2 SO.sub.4                        
                        with active                                       
                              with active                                 
                                     60% H.sub.2 SO.sub.4                 
                                             60% H.sub.2 SO.sub.4         
                                                      60% H.sub.2         
                                                      SO.sub.4 +          
type      60% H.sub.2 SO.sub.4                                            
                 80% H.sub.2 SO.sub.4                                     
                        carbon                                            
                              carbon 100 ppm HCl                          
                                             10 ppm HNO.sub.3             
                                                      400 ppm             
__________________________________________________________________________
                                                      Fe.sup.3+           
Ni-based                                                                  
       155                                                                
          0.31   0.41   0.55  0.72   0.37    0.44     0.76                
alloy plate                                                               
       156                                                                
          0.44   0.52   0.63  0.88   0.46    0.55     0.87                
of the 157                                                                
          0.21   0.43   0.61  0.71   0.24    0.38     0.75                
present                                                                   
       158                                                                
          0.06   0.09   0.73  0.84   0.09    0.17     0.38                
invention                                                                 
       159                                                                
          0.24   0.35   0.51  0.63   0.27    0.36     0.43                
       160                                                                
          0.23   0.47   0.54  0.58   0.29    0.44     0.66                
       161                                                                
          0.14   0.69   0.34  0.49   0.21    0.48     0.52                
       162                                                                
          0.09   0.28   0.57  0.82   0.18    0.19     0.59                
       163                                                                
          0.33   0.39   0.54  0.76   0.37    0.46     0.71                
       164                                                                
          0.05   0.21   0.61  0.84   0.11    0.17     0.55                
       165                                                                
          0.12   0.29   0.55  0.61   0.17    0.34     0.51                
       166                                                                
          0.14   0.31   0.57  0.58   0.19    0.27     0.48                
       167                                                                
          0.15   0.34   0.51  0.66   0.24    0.31     0.49                
__________________________________________________________________________
 
    
     
                                           TABLE 49                                
__________________________________________________________________________
          corrosion speed by soaking in sulfuric acid liquid              
          (mm/year)                                                       
                        60% H.sub.2 SO.sub.4                              
                              80% H.sub.2 SO.sub.4                        
                        with active                                       
                              with active                                 
                                     60% H.sub.2 SO.sub.4                 
                                             60% H.sub.2 SO.sub.4         
                                                      60% H.sub.2         
                                                      SO.sub.4 +          
type      60% H.sub.2 SO.sub.4                                            
                 80% H.sub.2 SO.sub.4                                     
                        carbon                                            
                              carbon 100 ppm HCl                          
                                             10 ppm HNO.sub.3             
                                                      400 ppm             
__________________________________________________________________________
                                                      Fe.sup.3+           
Comparative                                                               
       28 0.20   0.83   0.63  0.92   0.24    0.51     0.88                
Ni-based                                                                  
       29 0.12   0.09   16.8  1.33   0.19    0.39     0.52                
alloy plate                                                               
       30 0.23   0.32   2.11  2.03   0.31    1.13     0.93                
       31 0.94   1.27   11.7  1.04   1.04    1.81     1.95                
       32 0.76   0.56   24.8  1.76   0.88    0.63     2.27                
       33 0.32   0.86   1.91  1.33   0.34    0.59     0.98                
       34 0.21   0.42   0.61  0.63   0.27    0.29     0.66                
       35 0.52   0.44   22.3  0.92   0.63    1.45     1.45                
       36 0.08   0.12   37    0.81   0.14    0.24     0.29                
       37 0.28   0.19   71    0.63   0.36    0.46     0.65                
__________________________________________________________________________
 
    
     
                                           TABLE 50                                
__________________________________________________________________________
          corrosion speed by soaking in sulfuric acid liquid              
          (mm/year)                                                       
                        60% H.sub.2 SO.sub.4                              
                              80% H.sub.2 SO.sub.4                        
                        with active                                       
                              with active                                 
                                     60% H.sub.2 SO.sub.4                 
                                             60% H.sub.2 SO.sub.4         
                                                      60% H.sub.2         
                                                      SO.sub.4 +          
type      60% H.sub.2 SO.sub.4                                            
                 80% H.sub.2 SO.sub.4                                     
                        carbon                                            
                              carbon 100 ppm HCl                          
                                             10 ppm HNO.sub.3             
                                                      400 ppm             
__________________________________________________________________________
                                                      Fe.sup.3+           
Comparative                                                               
       38 0.44   0.32   9.34  0.81   0.53    0.93     1.18                
Ni-based                                                                  
       39 0.84   0.66   10.3  2.24   0.92    1.72     2.03                
alloy plate                                                               
       40 0.64   1.82   18.1  2.21   0.71    0.95     1.76                
       41 0.24   0.71   0.76  0.98   0.32    0.55     0.81                
       42 0.58   0.76   3.67  2.15   0.64    1.16     1.77                
       43 0.22   0.08   0.52  0.56   --      --       --                  
Conven-                                                                   
       5  3.21   10.3   15.2  2.45   3.24    3.10     2.63                
tional 6  0.92   16.2   32.3  0.15   1.07    1.15     3.35                
Ni-based                                                                  
       7  0.06   0.03   15.3  1.60   0.14    0.87     1.73                
alloy plate                                                               
       8  0.02   0.01   20.2  0.76   0.04    0.53     0.63                
       9  31.4   8.23   0.12  0.32   --      30.2     6.65                
__________________________________________________________________________