LEADLESS FREE-CUTTING COPPER ALLOY

Abstract: Lead-free copper alloys with industrially satisfactory machinability comprising 69 to 79 percent, by weight, of copper, 2.0 to 4.0 percent, by weight, of silicon, and the remaining percent, by weight, of zinc.

Description: BACKGROUND OF THE INVENTION 1. Field of The Invention The present invention relates to lead-free, free-cutting copper alloys. 2. Prior Art Among the copper alloys with a good machinability are bronze alloys such as the one under JIS designation H5111 BC6 and brass alloys such as the ones under JIS designations H3250-C3604 and C3771. Those alloys are enhanced in machinability by the addition of 1.0 to 6.0 percent, by weight, of lead and provide an industrially satisfactory machinability. Because of their excellent machinability, those lead-contained copper alloys have been an important basic material for a variety of articles such as city water faucets, water supply/drainage metal fittings and valves. However, the application of those lead-mixed alloys has been greatly limited in recent years, because lead contained therein is an environment pollutant harmful to humans. That is, the lead-containing alloys pose a threat to human health and environmental hygiene because lead is contained in metallic vapor that is generated in the steps of processing those alloys at high temperatures such as melting and casting and there is also concern that lead contained in the water system metal fittings, valves and others made of those alloys will dissolve out into drinking water. On that ground, the United States and other advanced countries have been moving to tighten the standards for lead-contained copper alloys to drastically limit the permissible level of lead in copper alloys in recent years. In Japan, too, the use of lead-contained alloys has been increasingly restricted, and there has been a growing call for development of free-cutting copper alloys with a low lead content. US Patent 1 954 003 discloses a chill or die casting of an alloy consisting of from 65% and up to 94% copper, and from 2% to 6% silicon, from 3% to 28% zinc, and an appreciable amount of aluminium not more than 2%. SUMMARY OF THE INVENTION It is an object of the present invention to provide a lead-free copper alloy which does not contain the machinability-improving element lead yet is quite excellent in machinability and can be used as safe substitute for the conventional free cutting copper alloy with a large content of lead presenting environmental hygienic problems and which permits recycling of chips without problems, thus a timely answer to the mounting call for restriction of lead-contained products. It is an another object of the present invention to provide a lead-free copper alloy which has a high corrosion resistance as well as an excellent machinability and is suitable as basic material for cutting works, forgings, castings and others, thus having a very high practical value. The cutting works, forgings, castings and others include city water faucets, water supply/drainage metal fittings, valves, stems, hot water supply pipe fittings, shaft and heat exchanger parts. It is yet another object of the present invention to provide a lead-free copper alloy with a high strength and wear resistance as well as machinability which is suitable as basic material for the manufacture of cutting works, forgings, castings and other uses requiring a high strength and wear resistance such as, for example, bearings, bolts, nuts, bushes, gears, sewing machine parts and hydraulic system parts, hence has a very high practical value. It is a further object of the present invention to provide a lead-free copper alloy with an excellent high-temperature oxidation resistance as well as machinability which is suitable as basic material for the manufacture of cutting works, forgings, castings and other uses where a high thermal oxidation resistance is essential, e.g. nozzles for kerosene oil and gas heaters, burner heads and gas nozzles for hot-water dispensers, hence has a very high practical value. The objects of the present inventions are achieved by provision of the following copper alloys according to claim 1. Lead forms no solid solution in the matrix but disperses in a granular form to improve the machinability. Silicon raises the easy-to-cut property by producing a gamma phase (in some cases, a kappa phase) in the structure of metal. That way, both are common in that they are effective in improving the machinability, though they are quite different in contribution to the properties of the alloy. On the basis of that recognition, silicon is added to the first invention alloy in place of lead so as to bring about a high level of machinability meeting the industrial requirements. That is, the first invention alloy is improved in machinability through formation of a gamma phase with the addition of silicon. The addition of less than 2.0 percent, by weight, of silicon cannot form a gamma phase sufficient to secure an industrially satisfactory machinability. With the increase in the addition of silicon, the machinability improves. But with the addition of more than 4.0 percent, by weight, of silicon, the machinability will not go up in proportion. The problem is, however, that silicon has a high melting point and a low specific gravity and is also liable to oxidize. If silicon alone is fed in the form of a simple substance into a furnace in the alloy melting step, then silicon will float on the molten metal and is oxidized into oxides of silicon or silicon oxide, hampering production of a silicon-contained copper alloy. In making an ingot of silicon-containing copper alloy, therefore, silicon is usually added in the form of a Cu-Si alloy, which boosts the production cost. In the light of the cost of making the alloy, too, it is not desirable to add silicon in a quantity exceeding the saturation point where machinability improvement levels off - 4.0 percent by weight. An experiment showed that when silicon is added in an amount of 2.0 to 4.0 percent, by weight, it is desirable to hold the content of copper at 69 to 79 percent, by weight, in consideration of its relation to the content of zinc in order to maintain the intrinsic properties of the Cu-Zn alloy. The addition of silicon improves not only the machinability but also the flow of the molten metal in casting, strength, wear resistance, resistance to stress corrosion cracking, high-temperature oxidation resistance. Also, the ductility and dezincification resistance will be improved to some extent. The optional elements Bismuth, tellurium and selenium as well as lead do not form a solid solution in the matrix but disperse in granular form to enhance the machinability and that through a mechanism different from that of silicon. Hence, the addition of those elements along with silicon could further improve the machinability beyond the level obtained by the addition of silicon alone. The addition of bismuth, tellurium or selenium in addition to silicon produces a high machinability such that complicated forms could be freely cut at a high speed. But no improvement in machinability can be realized from the addition of bismuth, tellurium or selenium in an amount less than 0.02 percent, by weight. Meanwhile, those elements are expensive as compared with copper. Even if the addition exceeds 0.4 percent by weight, the proportional improvement in machinability is so small that the addition beyond that does not pay economically. What is more, if the addition is more than 0.4 percent by weight, the alloy will deteriorate in hot workability such as forgeability and cold workability such as ductility. While it might be feared that heavy metals like bismuth would cause problems similar to those of lead, an addition in a very small amount of less than 0.4 percent by weight is negligible and would present no particular problems. From those considerations, the addition of bismuth, tellurium or selenium kept to 0.02 to 0.4 percent by weight. The addition of those elements, which work on the machinability of the copper alloy though a mechanism different from that of silicon as mentioned above, would not affect the proper contents of copper and silicon. Aluminum is, too, effective in promoting the formation of the gamma phase. The addition of aluminum together with tin or in place of tin could further improve the machinability of the Cu-Si-Zn. Aluminum is also effective in improving the strength, wear resistance and high temperature oxidation resistance as well as the machinability and also in keeping down the specific gravity. If the machinability is to be improved at all, aluminum will have to be added in at least 1.0 percent by weight. But the addition of more than 3.5 percent by weight could not produce the proportional results. Instead, that could affect the ductility as is the case with aluminum. As to phosphorus, it has no property of forming the gamma phase as tin and aluminum. But phosphorus works to uniformly disperse and distribute the gamma phase formed as a result of the addition of silicon alone or with tin or aluminum or both of them. That way, the machinability improvement through the formation of gamma phase is further enhanced. In addition to dispersing the gamma phase, phosphorus helps refine the crystal grains in the alpha phase in the matrix, improving hot workability and also strength and resistance to stress corrosion cracking. Furthermore, phosphorus substantially increases the flow of molten metal in casting. To produce such results, phosphorus will have to be added in an amount not smaller than 0.02 percent by weight. But if the addition exceeds 0.25 percent by weight, no proportional effect can be obtained. Instead, there would be a fall in hot forging property and extrudability. As described above, phosphorus disperses the gamma phase uniformly and at the same time refines the crystal grains in the alpha phase in the matrix, thereby improving the machinability and also the corrosion resistance properties (dezincification resistance and erosion corrosion resistance), forgeability, stress corrosion cracking resistance and mechanical strength. The addition of phosphorus in a very small quantity, that is, 0.02 or more percent by weight could produce results. But the addition in an amount of more than 0.25 percent by weight would not produce proportional results. Instead, that would reduce the hot forgeability and extrudability. It is also noted that aluminum and phosphorus help to reinforce the alpha phase in the matrix, thereby improving strength, wear resistance, and also machinability. Phosphorus disperses the alpha and gamma phases, by which the strength, wear resistance and also machinability are improved. A lead-free, free-cutting copper alloy also with excellent machinability coupled with a good high-temperature oxidation resistance which is composed of 69 to 79 percent, by weight, of copper; 2.0 to 4.0 percent, by weight, of silicon; 0.1 to 1.5 percent, by weight, of aluminum; 0.02 to 0.25 percent, by weight, of phosphorus; and the remaining percent, by weight, of zinc. This copper alloy will be hereinafter called the "ninth invention alloy". Aluminum is an element which improves the strength, machinability, wear resistance and also high-temperature oxidation resistance. Silicon, too, has a property of enhancing the machinability, strength, wear resistance, resistance to stress corrosion cracking and also high-temperature oxidation resistance, as mentioned above. Aluminum works to raise the high-temperature oxidation resistance when aluminium is added in an amount not less than 0.1 percent by weight together with silicon. But even if the addition of aluminum increases beyond 1.5 percent by weight, no proportional results can be expected. For this reason, the addition of aluminum is set at 0.1 to 1.5 percent by weight. Phosphorus is added to enhance the flow of molten metal in casting. Phosphorus also works for improvement of the aforesaid machinability, dezincification resistance and also high-temperature oxidation resistance in addition to the flow of molten metal. Those effects are exhibited when phosphorus is added in an amount not less than 0.02 percent by weight. But even if phosphorus is used in more than 0.25 percent by weight, it will not result in a proportional increase in effect. For this consideration, the addition of phosphorus settles down on 0.02 to 0.25 percent by weight. While silicon is added to improve the machinability as mentioned above, it is also capable of increasing the flow of molten metal like phosphorus. The effect of silicon in raising the flow of molten metal is exhibited when it is added in an amount not less than 2.0 percent' by weight. The range of the addition of silicon for improving the flow of molten metal overlaps that for improvement of the machinability. These taken into consideration, the addition of silicon is set to 2.0 to 4.0 percent by weight. A lead-free, free-cutting copper alloy also with excellent machinability and a good high-temperature oxidation resistance which is composed of 69 to 79 percent, by weight, of copper; 2.0 to 4.0 percent, by weight, of silicon; 0.1 to 1.5 percent, by weight, of aluminum; 0.02 to 0.25 percent, by weight, of phosphorus; at least one element selected from among 0.02 to 0.4 percent, by weight, of chromium and 0.02 to 0.4 percent, by weight, of titanium; and the remaining percent, by weight, of zinc. This copper alloy will be hereinafter called the "tenth invention alloy". Chromium and titanium are added for improving the high-temperature oxidation resistance. Good results can be expected especially when they are added together with aluminum to produce a synergistic effect. Those effects are exhibited when the addition is 0.02 percent or more by weight, whether they are used alone or in combination. The saturation point is 0.4 percent by weight. In consideration of such observations, the tenth invention alloy contains at least one element selected from among 0.02 to 0.4 percent by weight of chromium and 0.02 to 0.4 percent by weight of titanium in addition to the components of the ninth invention alloy and is an improvement over the ninth invention alloy with regard to the high-temperature oxidation resistance. A lead-free, free-cutting copper alloy also with excellent machinability and a good high-temperature oxidation resistance which is composed of 69 to 79 percent, by weight, of copper; 2.0 to 4.0 percent, by weight, of silicon; 0.1 to 1.5 percent, by weight, of aluminum; 0.02 to 0.25 percent, by weight, of phosphorus; at least one element selected from among 0.02 to 0.4 percent, by weight, of bismuth, 0.02 to 0.4 percent, by weight, of tellurium and 0.02 to 0.4 percent, by weight, of selenium; and the remaining percent, by weight, of zinc. This copper alloy will be hereinafter called the "eleventh invention alloy". The eleventh invention alloy contains at least one element selected from among 0.02 to 0.4 percent, by weight, of bismuth, 0.02 to 0.4 percent, by weight, of tellurium an 0.02 to 0.4 percent, by weight, of selenium in addition to the components of the ninth invention alloy. While as high a high-temperature oxidation resistance as in the ninth invention alloy is secured, the eleventh invention alloy is further improved in machinability by adding at least one element selected from among bismuth and other elements which are effective in raising the machinability through a mechanism other than that exhibited by silicon. A lead-free, free-cutting copper alloy also with excellent machinability and a good high-temperature oxidation resistance which is composed of 69 to 79 percent, by weight, of copper; 2.0 to 4.0 percent, by weight, of silicon; 0.1 to 1.5 percent, by weight, of aluminum; 0.02 to 0.25 percent, by weight, of phosphorus; at least one element selected from among 0.02 to 0.4 percent, by weight, of chromium, and 0.02 to 0.4 percent by weight of titanium; at least one element selected from among 0.02 to 0.4 percent, by weight, of bismuth, 0.02 to 0.4 percent, by weight, of tellurium and 0.02 to 0.4 percent, by weight, of selenium; and the remaining percent, by weight, of zinc. This copper alloy will be hereinafter called the "twelfth invention alloy". The twelfth invention alloy contains at least one element selected from among 0.02 to 0.4 percent, by weight, of bismuth, 0.02 to 0.4 percent, by weight, of tellurium and 0.02 to 0.4 percent, by weight, of selenium in addition to the components of the tenth invention alloy. While as high a high-temperature oxidation resistance as in the tenth invention alloy is secured, the twelfth invention alloy is further improved in machinability by adding at least one element selected from among bismuth and other elements which are effective in raising the machinability through a mechanism other than that exhibited by silicon. Further improved machinability is obtained by subjecting any one of the preceding invention alloys to a heat treatment for 30 minutes to 5 hours at 400°C to 600° C. The invention alloys contain machinability improving elements such as silicon and have an excellent machinability because of the addition of such elements. Of those invention alloys, the alloys with a high copper content which have great amounts of other phases, mainly kappa phase, than alpha, beta, gamma and delta phases can further improve in machinability in a heat treatment. In the heat treatment, the kappa phase turns to a gamma phase. The gamma phase finely disperses and precipitates to further enhance the machinability. The alloys with a high content of copper are high in ductility of the matrix and low in absolute quantity of gamma phase, and therefore are excellent in cold workability. But in case cold working such as caulking and cutting are required, the aforesaid heat treatment is very useful. In other words, among the invention alloys, those which are high in copper content with gamma phase in small quantities and kappa phase in large quantities (hereinafter referred to as the "high copper content alloy") undergo a change in phase from the kappa phase to the gamma phase in a heat treatment. As a result, the gamma phase is finely dispersed and precipitated, and the machinability is improved. In the manufacturing process of castings, expanded metals and hot forgings in practice, the materials are often force-air-cooled or water cooled depending on the forging conditions, productivity after hot working (hot extrusion, hot forging etc.), working environment and other factors. In such cases, among the invention alloys, those with a low content of copper (hereinafter called the low copper content alloy") are rather low in the content of the gamma phase and contain beta phase. In a heat treatment, the beta phase changes into gamma phase, and the gamma phase is finely dispersed and precipitated, whereby the machinability is improved. Experiments showed that heat treatment is especially effective with high copper content alloys where mixing ratio of copper and silicon to other added elements (except for zinc) A is given as 67 ≤ Cu - 3Si + aA or low copper content alloys with such a composition with 64 ≥ Cu - 3Si + aA. It is noted that a is a coefficient. The coefficient is different depending on the added element A. For example, with tin a is - 0.5; aluminum, -2; phosphorus, -3; antimony, 0; arsenic, 0; manganese, +2.5; and nickel, +2.5. But a heat treatment temperature at less than 400°C is not economical and practical, because the aforesaid phase change will proceed slowly and much time will be needed. At temperatures over 600 C, on the other hand, the kappa phase will grow or the beta phase will appear, bringing about no improvement in machinability. From the practical viewpoint, therefore, it is desired to perform the heat treatment for 30 minutes to 5 hours at 400 to 600 C. BRIEF DESCRIPTION OF THE DRAWING Fig. 1 shows perspective views of cuttings formed in cutting a round bar of copper alloy by lathe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Example 1 As the first series of examples, cylindrical ingots with compositions given in Tables 1 to 35, each 100 mm in outside diameter and 150 mm in length, were hot extruded into a round bar 15 mm in outside diameter at 750°C to produce the following test pieces: first alloys Nos. 1001 to 1008, second alloys Nos. 2001 to 2011, third alloys Nos. 3001 to 3012, fourth alloys Nos. 4001 to 4049, fifth alloys Nos. 5001 to 5020, sixth alloys Nos. 6001 to 6105, seventh alloys Nos. 7001 to 7030, eighth alloys Nos. 8001 to 8147, ninth invention alloys Nos. 9001 to 9005, tenth invention alloys Nos. 10001 to 10008, eleventh invention alloys Nos. 11001 to 11007, and twelfth invention alloys Nos. 12001 to 12021. Also, cylindrical ingots with the compositions given in Table 36, each 100 mm in outside diameter and 150 mm in length, were hot extruded into a round bar 15 mm in outside diameter at 750°C to produce the following test pieces: thirteenth alloys Nos. 13001 to 13006. That is, No. 13001 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as first alloy No. 1005 for 30 minutes at 580°C, No. 13002 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as No. 13001 for two hours at 450°C. No. 13003 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as first alloy No. 1007 under the same conditions as for No. 13001 - for 30 minutes at 580°C. No. 13004 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as No. 13007 under the same conditions as for 13002 - for two hours at 450°C. No. 13005 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as first alloy No. 1008 under the same conditions as for No. 13001 - for 30 minutes at 580°C. No. 13006 is an alloy test piece obtained by heat-treating an extruded test piece with the same composition as No. 1008 and heat-treated under the same conditions as for 13002 - for two hours at 450°C. As comparative examples, cylindrical ingots with the compositions as shown in Table 37, each 100 mm in outside diameter and 150 mm in length, were hot extruded into a round bar 15 mm in outside diameter at 750 C to obtain the following round extruded test pieces: Nos. 14001 to 14006 (hereinafter referred to as the "conventional alloys"). No. 14001 corresponds to the alloy "JIS C 3604," No. 14002 to the alloy "CDA C 36000," No. 14003 to the alloy "JIS C 3771" and No. 14004 to the alloy "CDA C 69800." No. 14005 corresponds to the alloy "JIS C 6191." This aluminum bronze is the most excellent of the expanded copper alloys under the JIS designations with regard to strength and wear resistance. No. 14006 corresponds to the naval brass alloy "JIS C 4622" and is the most excellent of the expanded copper alloys under the JIS designations with regard to corrosion resistance. To study the machinability of the alloys in comparison with the conventional alloys, cutting tests were carried out. In the tests, evaluations were made on the basis of cutting force, condition of chips cut surface condition. The tests were conducted this way: The extruded test pieces obtained, as mentioned above, were cut on the circumferential surface by a lathe mounted with a point noise straight tool at a rake angle of - 8 degrees and at a cutting rate of 50 meters/minute, a cutting depth of 1.5 mm, a feed of 0.11 mm/rev. Signals from a three-component dynamometer mounted on the tool were converted into electric voltage signals and recorded on a recorder. From the signals were then calculated the cutting resistance. It is noted that while, to be perfectly exact, an amount of the cutting resistance should be judged by three component forces - cutting force, feed force and thrust force, the judgement was made on the basis of the cutting force (N) of the three component forces in the present example. The results are shown in Table 38 to Table 66. Furthermore, the chips from the cutting work were examined and classified into four forms (A) to (D) as shown in Fig. 1. The results are enumerated in Table 38 to Table 66. In this regard, the chips in the form of a spiral with three or more windings as (D) in Fig. 1 are difficult to process, that is, recover or recycle, and could cause trouble in cutting work as, for example, getting tangled with the tool and damaging the cut metal surface. Chips in the form of an arc with a half winding to a spiral with two about windings as shown in (C), Fig. 1 do not cause such serous trouble as the chips in the form of a spiral with three or more windings yet are not easy to remove and could get tangled with the tool or damage the cut metal surface. In contrast, chips in the form of a fine needle as (A) in Fig. 1 or in the form of an arc as (B) will not present such problems as mentioned above and are not bulky as the chips in (C) and (D) and easy to process. But fine chips as (A) still could creep into the sliding surfaces of a machine tool such as a lathe and cause mechanical trouble, or could be dangerous because they could stick into the worker's finger, eye or other body parts. Those taken into account, it is appropriate to consider that the chips in (B) are the best, and the second best are the chips in (A). Those in (C) and (D) are not good. In Table 38 to Table 66, the chips judged to be shown in (B), (A), (C) and (D) are indicated by the symbols "o ○", "o", "Δ" and "x" respectively. In addition, the surface condition of the cut metal surface was checked after cutting work. The results are shown in Table 38 to Table 66. In this regard, the commonly used basis for indication of the surface roughness is the maximum roughness (Rmax). While requirements are different depending on the application field of brass articles, the alloys with Rmax < 10 microns are generally considered excellent in machinability. The alloys with 10 microns s Rmax < 15 microns are judged as industrially acceptable, while those with Rmax ≥ 15 microns are taken as poor in machinability. In Table 38 to Table 65, the alloys with Rmax < 10 microns are marked "o", those with 10 microns ≤ Rmax < 15 microns are indicated as "Δ" and those with Rmax ≥ 15 microns are represented by a symbol "x". As is evident from the results of the cutting tests shown in Table 38 to Table 66, the following alloys are all equal to the conventional lead- contained alloys Nos. 14001 to 14003 in machinability: first alloys Nos. 1001 to 1008, second alloys Nos. 2001 to 2011, third alloys Nos. 3001 to 3012, fourth alloys Nos. 4001 to 4049, fifth alloys Nos. 5001 to 5020, sixth alloys Nos. 6001 to 6105, seventh alloys Nos. 7001 to 7030, eighth alloys Nos. 8001 to 8147, ninth invention alloys Nos. 9001 to 9005, tenth invention alloys Nos. 10001 to 10008, eleventh invention alloys Nos. 11001 to 11007, twelfth invention alloys Nos. 12001 to 12021. Especially with regard to formation of the chips, those invention alloys are favourably compared not only with the conventional alloys Nos. 14004 to 14006 with a lead content of not higher than 0.1 percent by weight but also Nos. 14001 to 14003 which contain large quantities of lead. Also to be noted is that as is clear from Tables Nos. 38 to 65, thirteenth alloys Nos. 13001 to 13006 are improved over first alloy No. 1005, No. 1007 and No. 1008 with the same composition as the' thirteenth alloys in machinability. It is thus confirmed that a proper heat treatment could further enhance the machinability. In another series of tests, the first to thirteenth alloys were examined in comparison with the conventional alloys in hot workability and mechanical properties. For the purpose, hot compression and tensile tests were conducted the following way. First, two test pieces, first and second test pieces, in the same shape 15 mm in outside diameter and 25 mm in length were cut out of each extruded test piece obtained as described above. In the hot compression tests, the first test piece was held for 30 minutes at 7000C, and then compressed 70 percent in the direction of axis to reduce the length from 25 mm to 7.5 mm. The surface condition after the compression (700°C deformability) was visually evaluated. The results are given in Table 38 to Table 66. The evaluation of deformability was made by visually checking for cracks on the side of the test piece. In Table 38 to Table 66, the test pieces with no cracks found are marked "o", those with small cracks are indicated in "Δ" and those with large cracks are represented by a symbol "x". The second test pieces were put to a tensile test by the commonly practised test method to determine the tensile strength, N/mm 2 and elongation, %. As the test results of the hot compression and tensile tests in Table 38 to Table 66 indicate, it was confirmed that the first to thirteenth alloys are equal to or superior to the conventional alloys Nos. 14001 to 14004 and No. 14006 in hot workability and mechanical properties and are suitable for industrial use. The seventh and eighth alloys in particular have the same level of mechanical properties as the conventional alloy No. 14005, the aluminum bronze which is the most excellent in strength of the expanded copper alloys under the JIS designations, and thus have understandably a prominent high strength feature. Furthermore, the first to six and ninth to thirteenth alloys were put to dezincification and stress corrosion cracking tests in accordance with the test methods specified under "ISO 6509" and "JIS H 3250" respectively to examine the corrosion resistance and resistance to stress corrosion cracking in comparison with the conventional alloys. In the dezincification test by the "ISO 6509" method, a sample taken from each extruded test piece was imbedded in a phenolic resin material in such a way that part of the side surface of the sample is exposed, the exposed surface perpendicular to the extrusion direction of the extruded test piece. The surface of the example was polished with emery paper No. 1200, and then ultrasonic-washed in pure water and dried. The sample thus prepared was dipped in a 12.7 g/l aqueous solution of cupric chloride dihydrate (CuCl 2 .2H 2 O) 1.0% and left standing for 24 hours at 75°C. The sample was taken out of the aqueous solution and the maximum depth of dezincification was determined. The measurements of the maximum dezincification depth are given in Table 38 to Table 50 and Table 61 to Table 66. As is clear from the results of dezincification tests shown in Table 38 to Table 50 and Table 61 to Table 66, the first to fourth alloys and the ninth to thirteenth alloys are excellent in corrosion resistance and favourably comparable with the conventional alloys Nos. 14001 to 14003 containing great amounts of lead. And it was confirmed that especially the fifth and sixth alloys which seek improvement in both machinability and corrosion resistance are very high in corrosion resistance and superior in corrosion resistance to the conventional alloy No. 14006, a naval brass which is the most resistant to corrosion of all the expanded alloys under the JIS designations. In the stress corrosion cracking tests in accordance with the test method described in "JIS H 3250," a 150-mm-long sample was cut out from each extruded test piece. The sample was bent with its centre placed on an arc-shaped tester with a radius of 40 mm in such a way that one end and the other end subtend an angle of 45 degrees. The test sample thus subjected to a tensile residual stress was degreased and dried, and then placed in an ammonia environment in the desiccator with a 12.5% aqueous ammonia (ammonia diluted in the equivalent of pure water). To be exact, the test sample was held some 80 mm above the surface of aqueous ammonia in the desiccator. After the test sample was left standing in the ammonia environment for two hours, 8 hours and 24 hours, the test sample was taken out from the desiccator, washed in sulfuric acid solution 10% and examined for cracks under a magnifier of 10 magnifications. The results are given in Table 38 to Table 50 and Table 61 to Table 66. In those tables, the alloys which have developed clear cracks when held in the ammonia environment for two hours are marked "xx." The test samples which had no cracks at passage of two hours but were found to have clear cracks at 8 hours are indicated by "x." The test samples which had no cracks at 8 hours, but were found to have clear cracks at 24 hours were indicated by "Δ". The test samples which were found to have no cracks at all at 24 hours are given a symbol "o." As is indicated by the results of the stress corrosion cracking test given in Table 38 to Table 50 and Table 61 to Table 66, it was confirmed that not only the fifth and sixth alloys which seek improvement in both machinability and corrosion resistance but also the first to fourth alloys and the ninth and thirteenth alloys in which nothing particular was done to improve corrosion resistance were both equal to the conventional alloy No. 14005, an aluminum bronze containing no zinc, in stress corrosion cracking resistance and were superior in stress corrosion cracking resistance to the conventional naval brass alloy No. 14006, the one which has a highest corrosion resistance of all the expanded copper alloys under the JIS designations. In addition, oxidation tests were carried out to study the high-temperature oxidation resistance of the ninth to twelfth invention alloys in comparison with the conventional alloys. A test piece in the shape of a round bar with the surface cut to a outside diameter of 14 mm and the length cut to 30 mm was prepared from each of the following extruded test pieces: No. 9001 to No. 9005, No. 10001 to No. 10008, No. 11001 to No. 11007, No. 12001 to No. 12021 and No. 14001 to No. 14006. Each test piece was then weighed to measure the weight before oxidation. After that, the test piece was placed in a porcelain crucible and held in an electric furnace maintained at 500°C. At passage of 100 hours, the test piece was taken out of the electric furnace and weighed to measure the weight after oxidation. From the measurements before and after oxidation was calculated the increase in weight by oxidation. It is understood that the increase by oxidation is an amount, mg, of increase in weight by oxidation per 10cm 2 of the surface area of the test piece and is calculated by the equation: increase in weight by oxidation, mg/10cm 2 = (weight, mg, after oxidation - weight, mg, before oxidation) x (10cm 2 / surface area, cm 2 , of test piece). The weight of each test piece increased after oxidation. The increase was brought about by high-temperature oxidation. Subjected to a high temperature, oxygen combines with copper, zinc and silicon to form Cu 2 O, ZnO, SiO 2 . That is, oxygen increase contributes to the weight gain. It can be said, therefore, that the alloys which are the smaller in weight increase by oxidation are the more excellent in high-temperature oxidation resistance. The results obtained are shown in Table 61 to Table 64 and Table 66. As is evident from the test results shown in Table 61 to Table 64 and Table 66, the ninth to twelfth invention alloys are equal to the conventional alloy No. 14005, an aluminum bronze ranking high in resistance to high-temperature oxidation among the expanded copper alloys under the JIS designations and are far smaller than any other conventional copper alloy. Thus, it was confirmed that the ninth to twelfth invention alloys are very excellent in machinability and resistance to high-temperature oxidation as well. Example 2 As the second series of examples, cylindrical ingots with compositions given in Tables 14 to 31, each 100 mm in outside diameter and 200 mm in length, were hot extruded into a round bar 35 mm in outside diameter at 700 C to produce the following test pieces: seventh alloys Nos. 7001a to 7030a and eighth alloys Nos. 8001a to 8147a. In parallel, cylindrical ingots with compositions given in Table 37, each 100 mm in outside diameter and 200 mm in length, were hot extruded into a round bar 35 mm in outside diameter at 700 C to produce the following alloy test pieces: Nos. 14001a to 14006a as second comparative examples (hereinafter referred to as the "conventional alloys"). It is noted that the alloys Nos. 7001a to 7030a, Nos. 8001a to 8147a and Nos. 14001a to 14006a are identical in composition with the aforesaid copper alloys Nos. 7001 to 7030, Nos. 8001 to 8147 and Nos. 14001 to No. 14006 respectively. Those seventh alloys Nos. 7001a to 7030a and eighth alloys Nos. 8001a to 8147a were put to wear resistance tests in comparison with the conventional alloys Nos. 14001a to 14006a. The tests were carried out in this procedure. Each extruded test piece thus obtained was cut on the circumferential surface, holed and cut down into a ring-shaped test piece 32 mm in outside diameter and 10 mm in thickness (that is, the length in the axial direction). The test piece was then fitted around a free-rotating shaft, and a roll 48 mm in outside diameter placed in parallel with the axis of the shaft was urged against the test piece under a load of 50 kg. The roll was made of stainless steel under the JIS designation SUS 304. Then, the SUS 304 roll and the test piece put in rotational sliding contact with the roll were rotated at the same rate of revolutions/minute - 209 r.p.m., with multipurpose gear oil being dropped onto the circumferential surface of the test piece. When the number of revolutions reached 100,000, the SUS 304 roll and the test piece were stopped, and the weight difference between the start and the end of rotation, that is, the loss of weight by wear, mg, was determined. It can be said that the alloys which are smaller in the loss of weight by wear are higher in wear resistance. The results are given in Tables 67 to 77. As is clear from the wear resistance test results shown in Tables 67 to 77, the tests showed that those seventh alloys Nos. 7001a to 7030a and eighth alloys Nos. 8001a to 8147a were excellent in wear resistance as compared with not only the conventional alloys Nos. 14001a to 14004a and 14006a but also No. 14005a, which is an aluminium bronze having a highest wear resistance of the expanded copper alloys under the JIS designations. From comprehensive considerations of the test results including the tensile test results, it may safely be said that the seventh and eighth alloys are excellent in machinability and also possess a higher strength feature and wear resistance than the aluminum bronze which is the highest in wear resistance of all the expanded copper alloys under the JIS designations. The alloys of tables 1 to 31, 36 and 37 are not according to the present invention, with the exception of alloys 4037, 4038 and 4040 which are invention alloys. No. alloy composition (wt%) Cu Si Zn 1001 70.2 2.1 remainder 1002 74.1 2.9 remainder 1003 74.8 3.1 remainder 1004 77.6 3.7 remainder 1005 78.5 3.2 remainder 1006 73.3 2.4 remainder 1007 77.0 2.9 remainder 1008 69.9 2.3 remainder No. alloy composition (wt%) Cu Si Bi Te Se Zn 2001 74.5 2.9 0.05 remainder 2002 74.8 2.8 0.25 remainder 2003 75.0 2.9 0.13 remainder 2004 69.9 2.1 0.32 0.03 remainder 2005 72.4 2.3 0.11 0.31 remainder 2006 78.2 3.4 0.14 0.03 remainder 2007 76.2 2.9 0.03 0.05 0.12 remainder 2008 78.2 3.7 0.33 remainder 2009 73.0 2.4 0.16 remainder 2010 74.7 2.8 0.04 0.30 remainder 2011 76.3 3.0 0.18 0.12 remainder No. alloy composition (wt%) Cu Si Sn Al P Zn 3001 71.8 2.4 3.1 remainder 3002 78.2 2.3 3.3 remainder 3003 75.0 1.9 1.5 1.4 remainder 3004 74.9 3.2 0.09 remainder 3005 71.6 2.4 2.3 0.03 remainder 3006 76.5 2.7 2.4 0.21 remainder 3007 76.5 3.1 0.6 1.1 0.04 remainder 3008 77.5 3.5 0.4 remainder 3009 75.4 3.0 1.7 remainder 3010 76.5 3.3 0.21 remainder 3011 73.8 2.7 0.04 remainder 3012 75.0 2.9 1.6 0.10 remainder No. alloy composition (wt%) Cu Si Sn Al Bi Te Se Zn 4001 70.8 1.9 3.4 0.36 remainder 4002 76.3 3.4 1.3 0.03 remainder 4003 73.2 2.5 1.9 0.15 remainder 4004 72.3 2.4 0.6 0.29 0.23 remainder 4005 74.2 2.7 2.0 0.03 0.26 remainder 4006 75.4 2.9 0.4 0.31 0.03 remainder 4007 71.5 2.1 2.6 0.11 0.05 0.23 remainder 4008 79.1 1.9 3.3 0.28 remainder 4009 76.3 2.7 1.2 0.13 remainder 4010 77.2 2.5 2.0 0.07 remainder 4011 79.2 3.1 1.1 0.04 0.06 remainder 4012 76.3 2.3 1.3 0.13 0.04 remainder 4013 77.4 2.6 2.6 0.22 0.03 remainder 4014 77.9 2.2 2.3 0.09 0.05 0.11 remainder 4015 73.5 2.0 2.9 1.2 0.23 remainder 4016 76.3 2.5 0.7 3.2 0.04 remainder 4017 75.5 2.3 1.2 2.0 0.12 remainder 4018 77.1 2.1 0.9 3.4 0.03 0.03 remainder 4019 72.9 3.2 3.3 1.7 0.11 0.04 remainder 4020 74.2 2.8 2.7 1.1 0.33 0.03 remainder No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Zn 4021 74.2 2.3 1.5 2.3 0.07 0.05 0.09 remainder 4022 70.9 2.1 0.11 0.11 remainder 4023 74.8 3.1 0.07 0.06 remainder 4024 76.3 3.2 0.05 0.02 remainder 4025 78.1 3.1 0.26 0.02 0.15 remainder 4026 71.1 2.2 0.13 0.02 0.05 remainder 4027 74.1 2.7 0.03 0.06 0.03 0.03 remainder 4028 70.6 1.9 3.2 0.31 0.04 remainder 4029 73.6 2.4 2.3 0.03 0.04 remainder 4030 73.4 2.6 1.7 0.31 0.22 remainder 4031 74.8 2.9 0.5 0.03 0.02 0.05 remainder 4032 73.0 2.6 0.7 0.09 0.02 0.08 remainder 4033 74.5 2.8 0.03 0.12 0.05 remainder 4034 77.2 3.3 1.3 0.03 0.12 0.04 remainder 4035 74.9 3.1 0.4 0.02 0.05 0.05 0.08 remainder 4036 79.2 3.3 2.5 0.05 0.12 remainder 4037 74.2 2.6 1.2 0.12 0.05 remainder 4038 77.0 2.8 1.3 0.05 0.20 remainder 4039 76.0 2.4 3.2 0.10 0.04 0.05 remainder 4040 74.8 2.4 1.1 0.07 0.04 0.03 remainder No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Zn 4041 77.2 2.7 2.1 0.33 0.05 0.05 remainder 4042 78.0 2.6 2.5 0.03 0.02 0.10 0.14 remainder 4043 72.5 2.4 1.9 1.1 0.12 0.03 remainder 4044 76.0 2.6 0.5 2.0 0.20 0.07 remainder 4045 77.5 2.6 0.7 3.1 0.21 0.12 remainder 4046 75.0 2.6 0.8 2.2 0.04 0.05 0.06 remainder 4047 71.0 1.9 3.1 1.0 0.15 0.02 0.04 remainder 4048 73.3 2.1 2.6 1.2 0.04 0.03 0.05 remainder 4049 74.8 2.5 0.6 1.1 0.03 0.03 0.04 0.07 remainder No. alloy composition (wt%) Cu Si Sn P Sb As Zn 5001 69.9 2.1 3.3 remainder 5002 74.1 2.7 0.21 remainder 5003 75.8 2.4 0.14 remainder 5004 77.3 3.4 0.05 remainder 5005 73.4 2.4 2.1 0.04 remainder 5006 75.3 2.7 0.4 0.04 remainder 5007 70.9 2.2 2.4 0.07 remainder 5008 71.2 2.6 1.1 0.03 0.03 remainder 5009 77.3 2.9 0.7 0.19 0.03 remainder 5010 78.2 3.1 0.4 0.09 0.15 remainder 5011 72.5 2.1 2.8 0.02 0.10 0.03 remainder 5012 79.0 3.3 0.24 0.02 remainder 5013 75.6 2.9 0.07 0.14 remainder 5014 74.8 3.0 0.11 0.02 remainder 5015 74.3 2.8 0.06 0.02 0.03 remainder 5016 72.9 2.5 0.03 remainder 5017 77.0 3.4 0.14 remainder 5018 76.8 3.2 0.7 0.12 remainder 5019 74.5 2.8 1.8 remainder 5020 74.9 3.0 0.20 0.05 remainder No. alloy composition (wt%) Cu Si Sn Bi Te P Sb As Zn 6001 69.6 2.1 3.2 0.15 remainder 6002 77.3 3.7 0.5 0.02 0.23 remainder 6003 75.2 2.4 1.1 0.33 0.12 remainder 6004 70.9 2.3 3.1 0.11 0.03 remainder 6005 78.1 2.7 0.6 0.14 0.02 0.07 remainder 6006 74.5 2.6 1.5 0.21 0.10 0.04 remainder 6007 74.7 3.2 2.1 0.05 0.02 0.12 remainder 6008 73.8 2.5 0.7 0.31 0.03 0.02 0.10 remainder 6009 74.5 2.9 0.05 0.19 remainder 6010 78.1 3.1 0.11 0.15 remainder 6011 74.6 3.3 0.02 0.22 remainder 6012 69.9 2.3 0.35 0.08 0.02 remainder 6013 73.2 2.6 0.21 0.03 0.07 remainder 6014 76.3 2.9 0.07 0.09 0.02 remainder 6015 74.4 2.8 0.19 0.13 0.03 0.02 remainder 6016 70.5 2.3 2.9 0.10 0.02 remainder 6017 74.7 2.4 0.9 0.31 0.04 0.05 remainder 6018 78.1 3.8 0.6 0.02 0.33 0.07 remainder 6019 69.4 2.0 3.4 0.11 0.03 0.03 remainder 6020 77.8 2.8 0.5 0.06 0.11 0.21 0.02 remainder No. alloy composition (wt%) Cu Si Sn Bi Te Se P Sb As Zn 6021 74.2 2.6 0.6 0.20 0.03 0.02 0.14 remainder 6022 75.8 3.3 1.8 0.03 0.06 0.11 0.02 remainder 6023 74.4 2.6 1.5 0.09 0.12 0.03 0.02 0.06 remainder 6024 77.3 3.1 0.02 0.25 0.08 remainder 6025 70.5 2.4 0.12 0.04 0.06 0.03 remainder 6026 74.3 2.9 0.24 0.02 0.13 0.11 remainder 6027 69.8 2.3 0.34 0.03 0.21 0.02 0.02 remainder 6028 74.5 2.9 0.03 0.11 0.13 remainder 6029 78.4 3.2 0.02 0.08 0.04 0.05 remainder 6030 73.8 3.0 0.08 0.31 0.23 remainder 6031 72.8 2.5 1.6 0.11 0.36 remainder 6032 78.1 3.7 0.5 0.03 0.02 0.05 remainder 6033 77.2 2.8 0.6 0.09 0.04 0.07 remainder 6034 76.9 3.8 0.4 0.03 0.06 0.07 remainder 6035 74.1 2.3 3.3 0.06 0.03 0.02 0.05 remainder 6036 69.8 2.0 2.5 0.31 0.12 0.03 0.06 remainder 6037 74.9 3.0 1.1 0.07 0.21 0.12 0.02 remainder 6038 72.6 2.8 0.6 0.20 0.05 0.21 0.07 0.03 remainder 6039 69.7 2.3 0.23 0.06 0.10 remainder 6040 75.4 3.0 0.02 0.09 0.11 0.03 remainder No. alloy composition (wt%) Cu Si Sn Bi Te Se P Sb As Zn 6041 73.2 2.5 0.11 0.36 0.05 0.02 remainder 6042 78.2 3.7 0.03 0.04 0.03 0.04 0.10 remainder 6043 77.8 2.8 0.09 0.02 0.04 remainder 6044 73.4 2.6 0.16 0.06 0.03 0.02 remainder 6045 71.2 2.4 0.35 0.14 0.08 remainder 6046 70.3 2.5 1.9 0.09 0.05 0.03 remainder 6047 74.5 3.6 2.2 0.02 0.20 0.04 0.04 remainder 6048 73.8 2.9 1.2 0.03 0.10 0.05 0.12 remainder 6049 69.8 2.1 3.1 0.32 0.03 0.05 0.13 remainder 6050 74.2 2.2 0.6 0.19 0.11 0.02 0.02 0.03 remainder 6051 74.8 3.2 0.5 0.03 0.07 0.03 0.05 0.02 remainder 6052 78.0 2.8 0.6 0.06 0.04 0.11 0.11 0.03 remainder 6053 76.3 2.4 0.8 0.05 0.03 0.22 0.03 0.04 0.03 remainder 6054 74.2 2.6 0.21 0.02 0.04 0.05 remainder 6055 78.2 2.9 0.16 0.08 0.03 0.21 0.03 remainder 6056 72.3 2.5 0.08 0.36 0.02 0.10 0.04 remainder 6057 69.8 2.4 0.36 0.04 0.04 0.06 0.07 0.02 remainder 6058 74.6 3.1 0.05 0.09 0.04 0.14 remainder 6059 73.8 2.5 0.08 0.05 0.03 0.02 0.04 remainder 6060 74.9 2.7 0.03 0.16 0.02 0.03 remainder No. alloy composition (wt%) Cu Si Sn Te Se P Sb As Zn 6061 69.7 2.6 3.1 0.26 remainder 6062 74.2 3.2 0.6 0.03 0.04 remainder 6063 74.9 2.6 0.7 0.14 0.14 remainder 6064 73.8 3.0 0.4 0.07 0.13 remainder 6065 78.1 3.3 0.8 0.02 0.12 0.02 remainder 6066 72.8 2.4 1.2 0.32 0.03 0.05 remainder 6067 73.6 2.7 2.1 0.03 0.07 0.02 remainder 6068 72.3 2.6 0.5 0.16 0.02 0.04 0.03 remainder 6069 70.6 2.3 0.33 0.09 remainder 6070 76.5 3.2 0.14 0.21 0.03 remainder 6071 74.5 3.1 0.05 0.03 0.03 remainder 6072 72.8 2.7 0.08 0.13 remainder 6073 78.0 3.8 0.04 0.02 0.12 remainder 6074 73.8 2.9 0.20 0.10 remainder 6075 74.5 2.9 0.07 0.04 0.10 0.02 remainder 6076 73.6 3.2 2.1 0.04 0.07 remainder 6077 74.1 2.5 0.8 0.21 0.18 0.05 remainder 6078 77.8 2.9 0.6 0.11 0.05 0.07 remainder 6079 71.5 2.1 1.1 0.06 0.03 0.06 remainder 6080 72.6 2.3 0.5 0.15 0.23 0.11 0.02 remainder No. alloy composition (wt%) Cu Si Sn Te Se P Sb As Zn 6081 74.2 3.0 0.5 0.03 0.03 0.20 0.02 remainder 6082 70.6 2.2 2.6 0.32 0.05 0.13 0.03 remainder 6083 73.7 2.6 0.8 0.14 0.16 0.06 0.02 0.03 remainder 6084 74.5 3.1 0.04 0.04 0.05 remainder 6085 72.8 2.7 0.09 0.21 0.04 0.02 remainder 6086 76.2 3.3 0.03 0.04 0.11 0.04 remainder 6087 73.8 2.7 0.11 0.03 0.02 0.04 0.03 remainder 6088 74.9 2.9 0.05 0.31 0.05 remainder 6089 75.8 2.8 0.08 0.04 0.03 0.14 remainder 6090 73.6 2.4 0.27 0.10 0.06 remainder 6091 72.4 2.2 3.2 0.33 remainder 6092 75.0 3.2 0.6 0.05 0.10 remainder 6093 76.8 3.1 0.5 0.04 0.11 remainder 6094 74.5 2.9 0.7 0.08 0.15 remainder 6095 73.2 2.7 1.2 0.12 0.06 0.03 remainder 6096 69.6 2.4 2.3 0.14 0.04 0.02 remainder 6097 74.2 2.8 0.8 0.07 0.02 0.03 remainder 6098 74.4 2.9 0.8 0.06 0.03 0.03 0.03 remainder 6099 74.8 3.1 0.09 0.04 remainder 6100 73.9 2.8 0.05 0.10 0.04 remainder No. alloy composition (wt%) Cu Si Se P Sb As Zn 6101 76.1 3.0 0.04 0.05 0.02 remainder 6102 74.5 2.8 0.03 0.04 0.02 0.03 remainder 6103 74.3 2.6 0.31 0.04 remainder 6104 75.0 3.3 0.06 0.02 0.05 remainder 6105 73.9 2.9 0.10 0.11 remainder No. alloy composition (wt%) Cu Si Sn Al P Mn Ni Zn 7001 62.9 2.7 2.6 2.2 remainder 7001a 7002 64.8 3.4 1.8 3.1 remainder 7002a 7003 68.2 4.1 0.6 1.9 1.5 remainder 7003a 7004 66.5 3.5 1.9 0.9 1.9 remainder 7004a 7005 71.3 3.7 0.4 1.8 2.3 remainder 7005a 7006 73.6 2.9 0.7 2.1 1.3 0.8 remainder 7006a 7007 70.1 3.2 0.5 1.4 0.11 1.8 remainder 7007a 7008 77.1 4.2 0.8 2.3 0.03 1.8 remainder 7008a 7009 67.3 3.7 2.6 0.2 0.08 0.9 1.8 remainder 7009a 7010 75.5 3.9 2.3 0.8 remainder 7010a No. alloy composition (wt%) Cu Si Sn Al P Mn Ni Zn 7011 69.8 3.4 0.3 1.3 remainder 7011a 7012 71.2 4.0 1.4 2.1 1.2 remainder 7012a 7013 73.3 3.9 2.0 0.03 3.2 remainder 7013a 7014 65.9 2.9 0.3 0.21 1.3 remainder 7014a 7015 68.8 3.9 1.1 0.05 0.9 2.0 remainder 7015a 7016 68.1 4.0 0.4 0.04 2.8 remainder 7016a 7017 63.8 2.6 2.7 0.19 0.9 remainder 7017a 7018 66.7 3.4 1.3 0.07 1.2 0.8 remainder 7018a 7019 67.2 3.6 0.21 1.9 remainder 7019a 7020 69.1 3.8 0.06 2.2 remainder 7020a No. alloy composition (wt%) Cu Si Sn Al P Mn Ni Zn 7021 72.1 4.3 0.07 2.0 0.8 remainder 7021a 7022 71.3 3.9 1.1 3.1 remainder 7022a 7023 70.5 3.5 1.6 2.3 remainder 7023a 7024 70.0 3.6 1.5 3.2 remainder 7024a 7025 69.3 2.7 2.1 0.9 remainder 7025a 7026 70.2 3.5 1.4 2.1 remainder 7026a 7027 65.0 2.8 2.6 2.3 0.8 remainder 7027a 7028 69.8 3.6 1.5 1.7 2.4 remainder 7028a 7029 71.0 3.6 0.4 0.3 2.2 remainder 7029a 7030 68.4 4.2 2.6 3.3 remainder 7030a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se Mn Zn 8001 62.6 2.6 2.6 0.31 1.9 remainder 8001a 8002 65.3 3.4 1.8 0.11 0.02 2.5 remainder 8002a 8003 66.4 4.2 0.5 0.05 0.03 3.4 remainder 8003a 8004 72.1 4.4 0.4 0.06 0.05 0.02 2.8 remainder 8004a 8005 67.4 3.3 2.3 0.31 0.9 remainder 8005a 8006 63.8 2.8 2.9 0.06 0.07 2.1 remainder 8006a 8007 71.5 3.9 1.5 0.20 1.4 remainder 8007a 8008 64.2 2.9 2.4 0.3 0.28 2.1 remainder 8008a 8009 68.8 3.4 1.0 1.5 0.07 0.20 1.7 remainder 8009a 8010 65.3 3.6 2.8 0.2 0.05 0.13 2.2 remainder 8010a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Zn 8011 66.8 3.3 1.9 2.1 0.04 0.05 0.05 2.3 remainder 8011a 8012 75.1 4.1 0.4 2.4 0.03 1.8 remainder 8012a 8013 74.2 3.9 0.5 1.8 0.10 0.04 1.7 remainder 8013a 8014 77.1 4.2 0.4 2.1 0.32 2.0 remainder 8014a 8015 62.8 2.6 2.9 0.12 0.03 1.2 remainder 8015a 8016 64.4 2.9 2.7 0.23 0.09 0.13 1.8 remainder 8016a 8017 68.3 3.6 0.4 0.05 0.05 0.04 2.2 remainder 8017a 8018 73.2 4.3 0.5 0.06 0.02 0.11 0.02 3.1 remainder 8018a 8019 72.4 4.1 0.7 0.14 0.21 2.1 remainder 8019a 8020 69.5 3.7 0.7 0.06 0.04 0.05 1.9 remainder 8020a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Zn 8021 64.2 3.4 2.5 0.31 0.03 1.9 remainder 8021a 8022 65.6 3.7 2.3 0.2 0.06 0.03 1.4 remainder 8022a 8023 67.1 3.6 0.4 0.5 0.04 0.05 0.05 2.0 remainder 8023a 8024 73.2 4.0 0.5 2.1 0.03 0.05 0.12 2.4 remainder 8024a 8025 68.8 3.5 0.4 1.8 0.12 0.03 0.03 0.04 1.8 remainder 8025a 8026 66.5 3.4 1.2 0.3 0.24 0.21 1.7 remainder 8026a 8027 64.8 3.0 1.3 1.2 0.16 0.10 0.06 1.5 remainder 8027a 8028 71.2 3.9 0.4 1.0 0.14 0.03 2.6 remainder 8028a 8029 68.1 3.6 0.2 0.05 2.0 remainder 8029a 8030 64.9 2.9 0.3 0.28 0.08 1.0 remainder 8030a No. alloy composition (wt%) Cu Si Al Bi Te Se P Mn Zn 8031 75.3 3.9 2.1 0.07 0.04 0.8 remainder 8031a 8032 77.2 4.3 2.3 0.03 0.25 0.04 2.8 remainder 8032a 8033 64.7 2.8 2.2 0.33 0.9 remainder 8033a 8034 69.3 3.5 1.6 0.03 0.03 1.8 remainder 8034a 8035 71.2 3.8 1.5 0.21 2.0 remainder 8035a 8036 70.6 3.7 0.3 0.04 0.13 1.7 remainder 8036a 8037 69.7 3.8 1.4 0.12 0.04 0.04 1.8 remainder 8037a 8038 70.7 4.2 1.5 0.03 0.16 0.03 3.3 remainder 8038a 8039 70.4 3.9 0.2 0.15 0.10 0.02 0.04 2.2 remainder 8039a 8040 68.8 3.7 0.4 0.05 0.12 1.9 remainder 8040a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Ni Zn 8041 70.3 3.9 0.2 0.20 0.03 0.22 2.1 remainder 8041a 8042 74.6 4.3 2.1 0.12 0.03 2.4 remainder 8042a 8043 77.0 4.5 0.03 0.12 1.7 remainder 8043a 8044 70.6 3.9 0.10 0.06 0.04 2.6 remainder 8044a 8045 74.2 4.3 0.11 0.21 0.16 2.8 remainder 8045a 8046 69.9 3.8 0.06 0.11 0.03 0.08 1.2 remainder 8046a 8047 66.8 3.4 0.09 0.06 2.2 remainder 8047a 8048 71.3 4.2 0.04 0.05 0.05 1.4 remainder 8048a 8049 72.4 4.1 0.12 0.09 2.7 remainder 8049a 8050 62.9 2.8 2.8 0.12 1.5 remainder 8050a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se Ni Zn 8051 64.8 3.1 2.4 0.08 0.03 2.0 remainder 8051a 8052 68.9 3.9 0.3 0.03 0.06 1.8 remainder 8052a 8053 67.3 3.7 0.7 0.05 0.04 0.04 2.1 remainder 8053a 8054 66.5 3.8 0.9 0.31 2.2 remainder 8054a 8055 73.8 4.3 2.1 0.03 0.05 3.3 remainder 8055a 8056 74.2 4.4 1.3 0.03 2.7 remainder 8056a 8057 70.1 3.8 1.5 1.9 0.06 1.8 remainder 8057a 8058 67.9 2.9 0.8 2.3 0.16 0.06 0.9 remainder 8058a 8059 68.2 3.6 2.0 0.6 0.04 0.09 1.7 remainder 8059a 8060 66.6 3.5 1.8 0.2 0.10 0.05 0.05 1.2 remainder 8060a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Ni Zn 8061 67.6 3.6 0.4 0.6 0.30 1.8 remainder 8061a 8062 68.8 3.0 0.6 2.1 0.08 0.03 1.1 remainder 8062a 8063 71.2 4.1 2.4 0.8 0.31 2.2 remainder 8063a 8064 68.2 3.6 2.6 0.04 0.05 1.5 remainder 8064a 8065 63.9 2.9 2.3 0.32 0.02 0.08 0.8 remainder 8065a 8066 70.5 3.9 1.1 0.05 0.05 0.05 2.2 remainder 8066a 8067 67.7 3.7 1.2 0.09 0.03 0.02 0.04 2.0 remainder 8067a 8068 66.6 3.5 1.4 0.06 0.04 2.6 remainder 8068a 8069 72.3 4.1 0.6 0.05 0.04 0.10 3.0 remainder 8069a 8070 70.6 4.0 0.4 0.16 0.05 3.2 remainder 8070a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Ni Zn 8071 75.6 3.9 0.5 2.2 0.21 0.21 1.4 remainder 8071a 8072 71.2 3.4 0.7 1.5 0.18 0.10 0.14 1.3 remainder 8072a 8073 68.5 3.7 0.7 1.2 0.03 0.08 0.03 1.9 remainder 8073a 8074 64.9 3.2 0.8 0.4 0.12 0.03 0.04 0.04 1.8 remainder 8074a 8075 65.3 3.3 2.8 0.2 0.06 0.05 1.5 remainder 8075a 8076 68.8 4.0 2.5 0.6 0.05 0.13 0.03 2.7 remainder 8076a 8077 67.3 3.4 1.6 0.5 0.06 0.12 2.4 remainder 8077a 8078 77.0 4.1 2.2 0.13 2.1 remainder 8078a 8079 71.2 3.8 1.4 0.05 0.20 2.0 remainder 8079a 8080 68.2 3.6 1.3 0.04 0.05 2.6 remainder 8080a No. alloy composition (wt%) Cu Si Al Bi Te Se P Ni Zn 8081 67.3 3.4 0.8 0.05 0.06 0.03 1.7 remainder 8081a 8082 70.4 3.9 1.2 0.05 2.2 remainder 8082a 8083 73.6 3.9 1.3 0.21 0.06 3.1 remainder 8083a 8084 68.8 3.8 1.2 0.18 2.6 remainder 8084a 8085 67.5 3.5 1.2 0.04 0.16 1.8 remainder 8085a 8086 64.9 2.9 1.6 0.08 0.04 0.05 1.5 remainder 8086a 8087 76.3 4.3 1.5 0.29 0.05 0.10 2.8 remainder 8087a 8088 65.8 2.8 2.3 0.16 0.06 0.03 0.05 1.3 remainder 8088a 8089 66.7 3.3 2.1 0.32 0.03 1.8 remainder 8089a 8090 69.2 4.0 1.2 0.11 0.02 0.10 2.5 remainder 8090a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Ni Zn 8091 70.6 3.8 1.3 0.14 0.05 1.7 remainder 8091a 8092 67.2 3.4 0.05 0.04 2.0 remainder 8092a 8093 65.8 3.2 0.15 0.03 0.06 1.2 remainder 8093a 8094 67.7 3.7 0.06 0.10 0.08 2.1 remainder 8094a 8095 64.7 2.9 0.31 0.04 0.05 0.09 1.5 remainder 8095a 8096 66.5 3.6 0.18 0.21 2.3 remainder 8096a 8097 67.3 3.8 0.08 0.05 0.12 2.2 remainder 8097a 8098 65.9 3.6 0.21 0.20 2.5 remainder 8098a 8099 64.9 3.6 0.4 0.18 0.8 2.6 remainder 8099a 8100 67.3 3.8 1.8 0.03 0.06 1.9 1.0 remainder 8100a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se Mn Ni Zn 8101 62.9 2.9 2.4 0.20 0.16 1.3 0.9 remainder 8101a 8102 66.3 3.4 0.5 0.04 0.04 0.05 1.5 0.8 remainder 8102a 8103 65.8 3.8 2.6 0.03 1.4 1.2 remainder 8103a 8104 64.7 3.6 2.7 0.25 0.03 1.3 1.6 remainder 8104a 8105 70.4 3.9 1.8 0.07 1.0 2.0 remainder 8105a 8106 70.3 3.8 0.4 1.8 0.05 2.3 0.7 remainder 8106a 8107 72.1 3.7 0.4 2.1 0.03 0.05 1.3 1.2 remainder 8107a 8108 69.8 3.8 0.6 1.5 0.05 0.05 1.5 2.1 remainder 8108a 8109 75.4 4.2 0.6 1.8 0.05 0.04 0.04 2.3 1.1 remainder 8109a 8110 66.4 3.5 2.5 0.2 0.12 1.6 0.9 remainder 8110a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Ni Zn 8111 64.9 3.3 2.5 0.3 0.08 0.05 1.2 1.3 remainder 8111a 8112 70.0 3.8 1.2 0.5 0.03 1.5 0.8 remainder 8112a 8113 72.0 3.9 1.1 0.25 0.20 2.4 0.9 remainder 8113a 8114 66.5 3.6 1.2 0.06 0.04 0.05 1.3 1.1 remainder 8114a 8115 67.0 3.5 1.3 0.12 0.04 0.08 0.9 1.2 remainder 8115a 8116 64.0 2.8 2.6 0.30 0.08 0.03 0.05 0.8 1.0 remainder 8116a 8117 67.3 3.7 2.3 0.03 0.03 1.2 1.3 remainder 8117a 8118 66.4 3.8 2.4 0.05 0.15 0.03 1.0 1.6 remainder 8118a 8119 70.2 3.9 0.5 0.30 0.07 1.7 0.9 remainder 8119a 8120 73.1 4.2 0.5 2.3 0.04 0.14 2.0 1.1 remainder 8120a No. alloy composition (wt%) Cu Si Sn Al Bi Te Se P Mn Ni Zn 8121 71.0 3.6 0.6 2.3 0.03 0.12 0.20 1.8 1.0 remainder 8121a 8122 70.0 3.5 0.5 1.8 0.06 0.03 0.10 1.2 1.3 remainder 8122a 8123 66.5 3.4 0.5 0.7 0.30 0.03 0.02 0.03 1.0 1.5 remainder 8123a 8124 68.8 3.9 1.2 0.2 0.06 0.05 1.0 1.2 remainder 8124a 8125 64.9 3.0 1.8 0.5 0.25 0.05 0.05 1.1 0.8 remainder 8125a 8126 63.7 2.9 2.7 1.0 0.31 0.03 1.2 0.8 remainder 8126a 8127 70.4 3.9 0.2 0.04 1.6 1.3 remainder 8127a 8128 66.5 3.6 0.3 0.02 0.04 1.2 1.1 remainder 8128a 8129 67.3 3.7 0.7 0.03 0.08 1.3 1.2 remainder 8129a 8130 66.0 3.4 0.7 0.22 0.06 0.04 1.3 1.0 remainder 8130a No. alloy composition (wt%) Cu Si Al Bi Te Se P Mn Ni Zn 8131 68.0 3.8 0.8 0.05 1.1 1.4 remainder 8131a 8132 70.0 3.4 2.1 0.03 0.22 0.9 1.1 remainder 8132a 8133 75.5 4.2 2.2 0.05 1.2 1.9 remainder 8133a 8134 68.5 3.8 1.8 0.10 0.04 1.4 1.6 remainder 8134a 8135 76.5 4.3 2.1 0.03 0.10 0.15 1.6 1.3 remainder 8135a 8136 66.5 3.6 1.2 0.05 0.16 0.05 1.2 1.3 remainder 8136a 8137 72.0 4.1 1.0 0.04 0.03 0.02 0.07 1.3 2.2 remainder 8137a 8138 70.2 4.0 1.0 0.04 0.03 2.1 1.4 remainder 8138a 8139 66.8 3.8 0.5 0.32 0.03 0.03 1.2 1.6 remainder 8139a 8140 67.3 3.9 0.4 0.05 0.03 1.8 1.0 remainder 8140a No. alloy composition (wt%) Cu Si Bi Te Se P Mn Ni Zn 8141 66.5 3.6 0.05 0.05 1.5 1.2 remainder 8141a 8142 63.9 2.9 0.30 0.03 0.04 1.2 0.9 remainder 8142a 8143 68.4 3.8 0.03 0.05 0.12 0.9 2.5 remainder 8143a 8144 65.8 3.4 0.10 0.05 0.02 0.03 1.0 1.4 remainder 8144a 8145 70.5 3.9 0.12 0.05 2.6 0.8 remainder 8145a 8146 72.0 4.2 0.04 0.05 0.18 1.0 2.4 remainder 8146a 8147 68.0 3.7 0.20 0.06 1.5 1.0 remainder 8147a No. alloy composition (wt%) Cu Si Al P Zn 9001 72.6 2.3 0.8 0.03 remainder 9002 74.8 2.8 1.3 0.09 remainder 9003 77.2 3.6 0.2 0.21 remainder 9004 75.7 3.0 1.1 0.07 remainder 9005 78.0 3.8 0.7 0.12 remainder No. alloy composition (wt%) Cu Si Al P Cr Ti Zn 10001 74.3 2.9 0.6 0.05 0.03 remainder 10002 74.8 3.0 0.2 0.12 0.32 remainder 10003 74.9 2.8 0.9 0.08 0.33 remainder 10004 77.8 3.6 1.2 0.22 0.08 remainder 10005 71.9 2.3 1.4 0.07 0.02 0.24 remainder 10006 76.0 2.8 1.2 0.03 0.15 remainder 10007 75.5 3.0 0.3 0.06 0.20 remainder 10008 71.5 2.2 0.7 0.12 0.14 0.05 remainder No. alloy composition (wt%) Cu Si Al P Bi Te Se Zn 11001 74.8 2.8 1.4 0.10 0.03 remainder 11002 76.1 3.0 0.6 0.06 0.21 remainder 11003 78.3 3.5 1.3 0.19 0.18 remainder 11004 71.7 2.4 0.8 0.04 0.21 0.03 remainder 11005 73.9 2.8 0.3 0.09 0.33 0.03 remainder 11006 74.8 2.8 0.7 0.11 0.16 0.02 remainder 11007 78.3 3.8 1.1 0.05 0.22 0.05 0.04 remainder No. alloy composition (wt%) Cu Si Al Bi Te Se P Cr Ti Zn 12001 73.8 2.6 0.5 0.21 0.05 0.11 remainder 12002 76.5 3.2 0.9 0.03 0.11 0.03 remainder 12003 78.1 3.4 1.3 0.09 0.20 0.05 remainder 12004 70.8 2.1 0.6 0.22 0.06 0.08 0.32 remainder 12005 77.8 3.8 0.2 0.02 0.03 0.03 0.26 remainder 12006 74.6 2.9 0.7 0.15 0.02 0.10 0.06 remainder 12007 73.9 2.8 0.3 0.04 0.05 0.16 0.03 0.18 remainder 12008 75.7 2.9 1.2 0.03 0.12 0.05 remainder 12009 72.9 2.6 0.5 0.33 0.04 0.12 remainder 12010 76.5 3.2 0.3 0.32 0.03 0.35 remainder 12011 71.9 2.5 0.8 0.19 0.03 0.03 0.03 remainder 12012 74.7 2.9 0.6 0.07 0.05 0.21 0.06 remainder 12013 74.8 2.8 1.3 0.04 0.21 0.06 0.26 remainder 12014 78.2 3.8 1.1 0.22 0.05 0.03 0.04 0.24 remainder 12015 74.6 2.7 1.0 0.15 0.03 0.02 0.10 remainder 12016 75.5 2.9 0.7 0.22 0.05 0.34 0.02 remainder 12017 76.2 3.4 0.3 0.05 0.12 0.08 0.31 remainder 12018 77.0 3.3 1.1 0.03 0.14 0.03 0.05 0.03 remainder 12019 73.7 2.8 0.3 0.32 0.03 0.10 0.03 0.19 remainder 12020 74.8 2.8 1.2 0.02 0.14 0.05 0.14 0.05 remainder 12021 74.0 2.9 0.4 0.07 0.05 0.05 0.08 0.11 0.26 remainder No. alloy composition (wt%) heat treatment Cu Si Zn temperature time 13001 78.5 3.2 remainder 580°C 30min. 13002 78.5 3.2 remainder 450°C 2hr. 13003 77.0 2.9 remainder 580°C 30min. 13004 77.0 2.9 remainder 450°C 2hr. 13005 69.9 2.3 remainder 580°C 30min. 13006 69.9 2.3 remainder 450°C 2hr. No. alloy composition (wt%) Cu Si Sn Al Mn Pb Fe Ni Zn 14001 58.8 0.2 3.1 0.2 remainder 14001a 14002 61.4 0.2 3.0 0.2 remainder 14002a 14003 59.1 0.2 2.0 0.2 remainder 14003a 14004 69.2 1.2 0.1 remainder 14004a 14005 remainder 9.8 1.1 3.9 1.2 14005a 14006 61.8 1.0 0.1 remainder 14006a No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 1001 Δ Δ 146 290 ○ 470 32 Δ 1002 o ○ ○ 122 210 ○ 524 36 ○ 1003 o ○ ○ 119 190 ○ 543 34 ○ 1004 o ○ ○ 126 170 Δ 590 37 ○ 1005 Δ ○ 134 150 Δ 532 42 ○ 1006 o ○ Δ 129 230 ○ 490 34 ○ 1007 Δ ○ 132 170 Δ 512 41 ○ 1008 Δ Δ 137 270 ○ 501 31 Δ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 2001 ○ ○ 116 190 ○ 523 34 ○ 2002 o ○ ○ 117 190 ○ 508 36 ○ 2003 o ○ ○ 118 180 ○ 525 36 ○ 2004 o ○ ○ 119 280 Δ 463 28 Δ 2005 o ○ ○ 119 240 Δ 481 30 ○ 2006 o ○ ○ 119 170 Δ 552 36 ○ 2007 o ○ ○ 116 180 ○ 520 41 ○ 2008 o ○ ○ 115 140 Δ 570 34 ○ 2009 o ○ ○ 117 200 Δ 485 31 ○ 2010 o ○ ○ 114 180 ○ 507 34 ○ 2011 o ○ ○ 115 170 Δ 522 33 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 3001 o ○ Δ 128 40 ○ 553 26 ○ 3002 o ○ ○ 126 130 Δ 538 32 ○ 3003 o ○ ○ 126 50 ○ 526 28 ○ 3004 o ○ ○ 119 <5 ○ 533 36 ○ 3005 o ○ ○ 125 50 ○ 525 28 ○ 3006 o ○ ○ 120 <5 ○ 546 38 ○ 3007 o ○ ○ 121 <5 ○ 552 34 ○ 3008 o ○ ○ 122 80 ○ 570 36 ○ 3009 o ○ ○ 123 50 ○ 541 29 ○ 3010 o ○ ○ 118 <5 ○ 560 35 ○ 3011 o ○ ○ 119 20 ○ 502 34 ○ 3012 o ○ ○ 120 <5 ○ 534 31 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 4001 o ○ ○ 119 40 Δ 512 24 ○ 4002 o ○ ○ 122 50 ○ 543 30 ○ 4003 o ○ ○ 123 50 ○ 533 30 ○ 4004 o ○ ○ 117 80 Δ 520 31 ○ 4005 o ○ ○ 119 50 ○ 535 32 ○ 4006 o ○ ○ 116 60 ○ 532 31 ○ 4007 o ○ ○ 122 50 ○ 528 26 ○ 4008 o ○ ○ 124 100 Δ 554 30 ○ 4009 o ○ ○ 119 130 ○ 542 34 ○ 4010 o ○ ○ 119 120 ○ 562 35 ○ 4011 o ○ ○ 122 100 Δ 563 34 ○ 4012 o ○ ○ 119 130 ○ 524 40 ○ 4013 o ○ ○ 120 110 ○ 548 37 ○ 4014 o ○ ○ 120 120 Δ 539 36 ○ 4015 o ○ ○ 121 40 ○ 528 28 ○ 4016 o ○ ○ 122 60 ○ 597 32 ○ 4017 o ○ ○ 120 50 ○ 520 33 ○ 4018 o ○ ○ 123 60 ○ 553 31 ○ 4019 o ○ ○ 118 40 ○ 606 24 ○ 4020 o ○ ○ 120 40 ○ 561 26 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 4021 o ○ ○ 120 50 ○ 540 29 ○ 4022 o ○ ○ 123 <5 ○ 487 32 Δ 4023 o ○ ○ 117 <5 ○ 524 34 ○ 4024 o ○ ○ 117 40 ○ 541 37 ○ 4025 o ○ ○ 115 <5 Δ 526 43 ○ 4026 o ○ ○ 122 30 ○ 498 30 Δ 4027 o ○ ○ 118 30 ○ 516 35 ○ 4028 o ○ ○ 120 <5 ○ 529 27 ○ 4029 o ○ ○ 121 <5 ○ 544 28 ○ 4030 o ○ ○ 118 <5 ○ 536 30 ○ 4031 o ○ ○ 116 <5 ○ 524 31 ○ 4032 o ○ ○ 114 <5 ○ 515 32 ○ 4033 o ○ ○ 118 <5 ○ 519 37 ○ 4034 o ○ ○ 118 <5 ○ 582 31 ○ 4035 o ○ ○ 117 <5 ○ 538 32 ○ 4036 o ○ ○ 118 <5 Δ 600 34 ○ 4037 o ○ ○ 117 20 ○ 523 34 ○ 4038 o ○ ○ 116 <5 Δ 539 38 ○ 4039 o ○ ○ 118 20 ○ 544 34 ○ 4040 o ○ ○ 117 40 ○ 522 31 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 4041 o ○ ○ 120 20 ○ 565 31 ○ 4042 o ○ ○ 119 <5 ○ 567 34 ○ 4043 o ○ ○ 121 <5 ○ 530 29 ○ 4044 o ○ ○ 120 <5 ○ 548 31 ○ 4045 o ○ ○ 121 <5 ○ 572 32 ○ 4046 o ○ ○ 119 <5 ○ 579 29 ○ 4047 o ○ ○ 123 <5 ○ 542 26 ○ 4048 o ○ ○ 123 <5 ○ 540 28 ○ 4049 o ○ ○ 120 <5 ○ 539 33 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 5001 o ○ Δ 127 30 ○ 501 25 ○ 5002 o ○ ○ 119 <5 ○ 524 37 ○ 5003 o ○ Δ 135 10 ○ 488 41 ○ 5004 o ○ ○ 126 20 Δ 552 38 ○ 5005 o ○ ○ 123 <5 ○ 518 29 ○ 5006 o ○ ○ 122 <5 ○ 520 34 ○ 5007 o ○ Δ 125 <5 ○ 507 23 ○ 5008 o ○ ○ 122 <5 ○ 515 30 ○ 5009 o ○ ○ 124 <5 ○ 544 35 ○ 5010 o ○ ○ 123 <5 Δ 536 36 ○ 5011 o ○ Δ 126 <5 ○ 511 27 ○ 5012 o ○ ○ 124 <5 ○ 596 36 ○ 5013 o ○ ○ 119 <5 ○ 519 39 ○ 5014 o ○ ○ 122 <5 ○ 523 37 ○ 5015 o ○ ○ 123 <5 ○ 510 40 ○ 5016 o ○ ○ 120 20 ○ 490 35 Δ 5017 o ○ ○ 121 <5 ○ 573 40 ○ 5018 o ○ ○ 120 <5 ○ 549 39 ○ 5019 o ○ ○ 122 50 ○ 537 30 ○ 5020 o ○ ○ 118 <5 ○ 521 37 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6001 o ○ ○ 121 30 ○ 512 24 ○ 6002 o ○ ○ 122 <5 ○ 574 31 ○ 6003 o ○ ○ 117 <5 Δ 501 32 ○ 6004 o ○ ○ 120 <5 ○ 514 26 ○ 6005 o ○ ○ 121 <5 Δ 525 42 ○ 6006 ○ ○ 115 <5 ○ 514 32 ○ 6007 o ○ ○ 120 <5 ○ 548 27 ○ 6008 o ○ ○ 119 <5 ○ 503 30 ○ 6009 o ○ ○ 117 <5 ○ 522 38 ○ 6010 o ○ ○ 122 <5 Δ 527 41 ○ 6011 o ○ ○ 119 <5 ○ 536 32 ○ 6012 o ○ ○ 123 20 ○ 478 27 Δ 6013 o ○ ○ 118 <5 ○ 506 30 ○ 6014 o ○ ○ 118 <5 ○ 525 39 ○ 6015 ○ ○ 114 <5 ○ 503 35 ○ 6016 o ○ ○ 122 40 ○ 526 27 ○ 6017 o ○ ○ 119 <5 Δ 507 30 ○ 6018 o ○ ○ 121 <5 ○ 589 31 ○ 6019 o ○ ○ 120 <5 ○ 508 25 ○ 6020 o ○ ○ 121 <5 Δ 504 43 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6021 o ○ ○ 116 <5 ○ 501 33 ○ 6022 o ○ ○ 120 <5 ○ 547 29 ○ 6023 ○ ○ 119 <5 ○ 523 30 ○ 6024 o ○ ○ 120 <5 Δ 525 40 ○ 6025 o ○ ○ 120 <5 ○ 496 30 ○ 6026 ○ ○ 114 <5 ○ 518 34 ○ 6027 o ○ ○ 119 <5 ○ 487 28 Δ 6028 o ○ ○ 118 <5 ○ 524 35 ○ 6029 o ○ ○ 122 <5 Δ 540 41 ○ 6030 o ○ ○ 118 <5 ○ 511 29 ○ 6031 o ○ ○ 119 40 ○ 519 28 ○ 6032 o ○ ○ 120 <5 ○ 572 32 ○ 6033 o ○ ○ 123 <5 Δ 515 36 ○ 6034 o ○ ○ 122 <5 ○ 580 35 ○ 6035 o ○ ○ 123 <5 ○ 517 27 ○ 6036 o ○ ○ 121 <5 ○ 503 26 ○ 6037 ○ ○ 117 <5 ○ 536 30 ○ 6038 o ○ ○ 116 <5 ○ 506 30 ○ 6039 o ○ ○ 120 <5 ○ 485 28 Δ 6040 ○ ○ 116 <5 ○ 528 36 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6041 o ○ ○ 117 <5 ○ 496 30 ○ 6042 o ○ ○ 120 <5 Δ 574 34 ○ 6043 o ○ ○ 123 10 Δ 506 43 ○ 6044 o ○ ○ 115 10 ○ 500 30 ○ 6045 o ○ ○ 119 20 Δ 485 27 Δ 6046 o ○ ○ 121 40 ○ 512 24 ○ 6047 o ○ ○ 123 <5 ○ 557 25 ○ 6048 o ○ ○ 120 <5 ○ 526 30 ○ 6049 o ○ ○ 120 <5 ○ 502 24 ○ 6050 o ○ ○ 124 <5 ○ 480 31 ○ 6051 ○ ○ 117 <5 ○ 534 32 ○ 6052 o ○ ○ 123 <5 Δ 523 38 ○ 6053 o ○ ○ 123 <5 ○ 506 39 ○ 6054 o ○ ○ 115 <5 ○ 485 31 ○ 6055 o ○ ○ 122 <5 Δ 512 44 ○ 6056 o ○ ○ 120 <5 ○ 480 33 Δ 6057 o ○ ○ 121 <5 ○ 479 25 Δ 6058 ○ ○ 116 <5 ○ 525 34 ○ 6059 o ○ ○ 119 20 ○ 482 35 ○ 6060 ○ ○ 118 30 ○ 513 38 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6061 o ○ ○ 123 30 ○ 530 22 ○ 6062 o ○ ○ 119 10 ○ 538 33 ○ 6063 o ○ ○ 118 <5 ○ 504 37 ○ 6064 o ○ ○ 121 <5 ○ 526 30 ○ 6065 o ○ ○ 123 <5 ○ 565 35 ○ 6066 o ○ ○ 120 <5 ○ 501 25 ○ 6067 o ○ ○ 119 <5 ○ 526 26 ○ 6068 o ○ ○ 122 <5 ○ 502 30 ○ 6069 o ○ ○ 124 <5 ○ 484 28 Δ 6070 ○ ○ 115 <5 ○ 548 37 ○ 6071 o ○ ○ 118 <5 ○ 530 34 ○ 6072 o ○ ○ 119 <5 ○ 515 30 ○ 6073 o ○ ○ 121 <5 Δ 579 35 ○ 6074 o ○ ○ 117 <5 ○ 517 32 ○ 6075 o ○ ○ 117 <5 ○ 513 38 ○ 6076 o ○ ○ 122 40 ○ 535 28 ○ 6077 ○ ○ 119 <5 ○ 490 30 ○ 6078 o ○ ○ 122 <5 Δ 513 40 ○ 6079 o ○ ○ 118 <5 ○ 524 30 ○ 6080 o ○ ○ 123 <5 ○ 482 35 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6081 o ○ ○ 118 <5 ○ 536 34 ○ 6082 o ○ ○ 123 <5 ○ 510 25 ○ 6083 o ○ ○ 119 <5 ○ 504 32 ○ 6084 o ○ ○ 117 <5 ○ 533 34 ○ 6085 o ○ ○ 118 10 ○ 501 30 ○ 6086 o ○ ○ 117 <5 ○ 545 37 ○ 6087 o ○ ○ 119 <5 ○ 503 34 ○ 6088 ○ ○ 115 <5 ○ 526 36 ○ 6089 o ○ ○ 119 <5 ○ 514 39 ○ 6090 o ○ ○ 121 20 Δ 480 35 ○ 6091 o ○ ○ 122 30 ○ 516 24 ○ 6092 o ○ ○ 118 <5 ○ 532 30 ○ 6093 o ○ ○ 119 <5 ○ 539 34 ○ 6094 ○ ○ 117 <5 ○ 528 32 ○ 6095 o ○ ○ 119 <5 ○ 507 30 ○ 6096 o ○ ○ 122 <5 ○ 508 22 ○ 6097 o ○ ○ 117 <5 ○ 510 31 ○ 6098 o ○ ○ 117 <5 ○ 527 32 ○ 6099 o ○ ○ 116 <5 ○ 529 34 ○ 6100 o ○ ○ 119 <5 ○ 515 32 ○ No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 6101 ○ ○ 115 <5 ○ 530 38 ○ 6102 o ○ ○ 118 <5 ○ 512 36 ○ 6103 o ○ ○ 119 <5 ○ 501 35 ○ 6104 o ○ ○ 117 <5 ○ 535 32 ○ 6105 o ○ ○ 117 <5 ○ 517 37 ○ No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 7001 o ○ Δ 138 ○ 670 18 7002 o ○ Δ 136 ○ 712 20 7003 o ○ ○ 132 ○ 783 23 7004 o ○ ○ 138 ○ 736 21 7005 o ○ ○ 136 ○ 785 23 7006 o ○ Δ 139 ○ 700 24 7007 Δ ○ 138 ○ 707 23 7008 o ○ ○ 131 ○ 805 22 7009 o ○ ○ 136 ○ 768 19 7010 o ○ ○ 135 ○ 778 23 7011 Δ ○ 137 ○ 677 23 7012 o ○ ○ 134 ○ 800 21 7013 o ○ ○ 133 ○ 819 22 7014 Δ ○ 138 ○ 641 21 7015 o ○ ○ 134 ○ 764 23 7016 o ○ ○ 129 ○ 759 20 7017 Δ ○ 139 ○ 638 18 7018 o ○ ○ 135 ○ 717 20 7019 o ○ ○ 136 ○ 694 24 7020 Δ ○ 138 ○ 712 25 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 7021 o ○ ○ 130 ○ 754 24 7022 o ○ Δ 134 ○ 780 23 7023 o ○ ○ 133 ○ 765 22 7024 o ○ ○ 135 ○ 772 23 7025 Δ ○ 138 ○ 687 24 7026 o ○ ○ 135 ○ 718 24 7027 o ○ Δ 136 ○ 742 18 7028 Δ ○ 138 ○ 785 20 7029 o ○ ○ 134 ○ 703 23 7030 o ○ ○ 135 ○ 820 18 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8001 o ○ ○ 132 ○ 655 15 8002 o ○ ○ 129 ○ 708 17 8003 o ○ ○ 127 ○ 768 20 8004 o ○ ○ 128 ○ 785 18 8005 o ○ ○ 131 ○ 714 16 8006 o ○ ○ 134 ○ 680 16 8007 o ○ ○ 132 ○ 764 17 8008 o ○ ○ 130 ○ 673 16 8009 o ○ ○ 132 ○ 759 18 8010 o ○ ○ 132 ○ 751 15 8011 o ○ ○ 134 ○ 767 17 8012 o ○ ○ 128 ○ 796 18 8013 o ○ ○ 129 ○ 784 18 8014 o ○ ○ 129 ○ 802 17 8015 o ○ ○ 133 ○ 679 15 8016 o ○ ○ 130 ○ 706 16 8017 o ○ ○ 129 ○ 707 18 8018 o ○ ○ 131 ○ 780 16 8019 o ○ ○ 128 ○ 768 16 8020 o ○ ○ 132 ○ 723 19 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8021 o ○ ○ 134 ○ 765 16 8022 o ○ ○ 132 ○ 770 16 8023 o ○ ○ 131 ○ 746 18 8024 o ○ ○ 132 ○ 816 19 8025 o ○ ○ 129 ○ 759 18 8026 o ○ ○ 130 ○ 726 17 8027 o ○ ○ 133 ○ 703 17 8028 o ○ ○ 132 ○ 737 18 8029 o ○ ○ 129 ○ 719 20 8030 o ○ ○ 133 ○ 645 23 8031 o ○ ○ 129 ○ 764 22 8032 o ○ ○ 131 ○ 790 19 8033 o ○ ○ 133 ○ 674 20 8034 o ○ ○ 131 ○ 748 23 8035 o ○ ○ 129 ○ 777 22 8036 o ○ ○ 131 ○ 725 23 8037 o ○ ○ 128 ○ 770 21 8038 o ○ ○ 131 ○ 815 18 8039 o ○ ○ 127 ○ 739 24 8040 o ○ ○ 130 ○ 721 22 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8041 o ○ ○ 128 ○ 735 23 8042 o ○ ○ 127 ○ 822 18 8043 o ○ ○ 131 ○ 780 18 8044 o ○ ○ 126 ○ 726 21 8045 o ○ ○ 128 ○ 766 22 8046 o ○ ○ 127 ○ 712 23 8047 o ○ ○ 128 ○ 674 21 8048 o ○ ○ 129 ○ 753 24 8049 o ○ ○ 127 ○ 768 22 8050 o ○ ○ 132 ○ 691 17 8051 o ○ ○ 131 ○ 717 17 8052 o ○ ○ 128 ○ 739 21 8053 o ○ ○ 128 ○ 730 22 8054 o ○ ○ 127 ○ 735 20 8055 o ○ ○ 134 ○ 818 15 8056 o ○ ○ 132 ○ 812 16 8057 o ○ ○ 131 ○ 755 18 8058 o ○ ○ 133 ○ 659 20 8059 o ○ ○ 132 ○ 740 17 8060 o ○ ○ 130 ○ 714 19 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8061 o ○ ○ 129 ○ 705 21 8062 o ○ ○ 131 ○ 690 22 8063 o ○ ○ 133 ○ 811 18 8064 o ○ ○ 131 ○ 746 17 8065 o ○ ○ 133 ○ 652 19 8066 o ○ ○ 130 ○ 758 19 8067 o ○ ○ 129 ○ 734 19 8068 o ○ ○ 131 ○ 710 17 8069 o ○ ○ 131 ○ 767 20 8070 o ○ ○ 131 ○ 753 18 8071 o ○ ○ 129 ○ 792 19 8072 o ○ ○ 131 ○ 736 21 8073 o ○ ○ 130 ○ 767 22 8074 o ○ ○ 132 ○ 679 19 8075 o ○ ○ 134 ○ 728 17 8076 o ○ ○ 133 ○ 795 16 8077 o ○ ○ 133 ○ 716 18 8078 o ○ ○ 132 ○ 809 18 8079 o ○ ○ 129 ○ 758 22 8080 o ○ ○ 130 ○ 724 21 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8081 o ○ ○ 132 ○ 706 23 8082 o ○ ○ 130 ○ 768 23 8083 o ○ ○ 128 ○ 774 25 8084 o ○ ○ 129 ○ 765 22 8085 o ○ ○ 130 ○ 729 23 8086 o ○ ○ 133 ○ 687 24 8087 o ○ ○ 131 ○ 798 20 8088 o ○ ○ 132 ○ 699 23 8089 o ○ ○ 130 ○ 740 21 8090 o ○ ○ 132 ○ 782 18 8091 o ○ ○ 129 ○ 763 22 8092 o ○ ○ 130 ○ 680 22 8093 o ○ ○ 131 ○ 655 23 8094 o ○ ○ 128 ○ 714 21 8095 o ○ ○ 132 ○ 638 24 8096 o ○ ○ 128 ○ 689 22 8097 o ○ ○ 129 ○ 711 21 8098 o ○ ○ 130 ○ 693 20 8099 o ○ ○ 127 ○ 702 21 8100 o ○ ○ 129 ○ 724 18 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8101 o ○ ○ 131 ○ 685 18 8102 o ○ ○ 132 ○ 690 21 8103 o ○ ○ 133 ○ 744 17 8104 o ○ ○ 130 ○ 726 17 8105 o ○ ○ 133 ○ 751 19 8106 o ○ ○ 130 ○ 752 21 8107 o ○ ○ 131 ○ 760 21 8108 o ○ ○ 132 ○ 748 22 8109 o ○ ○ 130 ○ 807 18 8110 o ○ ○ 133 ○ 739 16 8111 o ○ ○ 132 ○ 717 17 8112 o ○ ○ 134 ○ 763 20 8113 o ○ ○ 129 ○ 745 22 8114 o ○ ○ 132 ○ 722 20 8115 o ○ ○ 130 ○ 706 17 8116 o ○ ○ 133 ○ 684 19 8117 o ○ ○ 132 ○ 740 18 8118 o ○ ○ 133 ○ 765 16 8119 o ○ ○ 128 ○ 733 22 8120 o ○ ○ 131 ○ 819 19 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8121 o ○ ○ 130 ○ 788 20 8122 o ○ ○ 131 ○ 755 22 8123 o ○ ○ 127 ○ 711 21 8124 o ○ ○ 130 ○ 763 20 8125 o ○ ○ 131 ○ 687 18 8126 o ○ ○ 134 ○ 706 17 8127 o ○ ○ 128 ○ 730 22 8128 o ○ ○ 130 ○ 702 23 8129 o ○ ○ 132 ○ 727 21 8130 o ○ ○ 130 ○ 701 24 8131 o ○ ○ 129 ○ 745 22 8132 o ○ ○ 132 ○ 749 21 8133 o ○ ○ 130 ○ 826 18 8134 o ○ ○ 128 ○ 770 20 8135 o ○ ○ 129 ○ 828 17 8136 o ○ ○ 129 ○ 746 20 8137 o ○ ○ 130 ○ 784 23 8138 o ○ ○ 131 ○ 779 21 8139 o ○ ○ 128 ○ 710 22 8140 o ○ ○ 131 ○ 717 22 No. machinability hot workability mechanical properties form of chippings condition of cut surface cutting force (N) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 8141 o ○ ○ 131 ○ 687 22 8142 o ○ ○ 130 ○ 635 20 8143 o ○ ○ 129 ○ 710 23 8144 o ○ ○ 130 ○ 662 24 8145 o ○ ○ 128 ○ 728 23 8146 o ○ ○ 129 ○ 753 21 8147 o ○ ○ 130 ○ 709 24 No. machinability corrosion resistance hot workability mechanical properties stress resistance corrosion cracking resistance form of chippings condition of cut surface cutting force (N) maximum depth of corrosion (µm) 700°C deformability tensile strength (N/mm 2 ) elongation (%) 13001 o ○ ○ 128 140 Δ 521 39 ○ 13002 o ○ ○ 126 130 Δ 524 41 ○ 13003 o ○ ○ 127 150 Δ 500 38 ○ 13004 o ○ ○ 127 160 Δ 508 38 ○ 13005 o ○ ○ 128 180 ○ 483 35 ○ 13006 o ○ ○ 129 170 ○ 488 37 ○ No. wear resistance weight loss by wear (mg/100000rot.) 7001a 1.3 7002a 0.8 7003a 0.9 7004a 1.4 7005a 1.3 7006a 1.7 7007a 1.8 7008a 1.2 7009a 0.8 7010a 2.4 7011a 1.9 7012a 1.2 7013a 1.1 7014a 2.7 7015a 1.4 7016a 1.3 7017a 1.6 7018a 1.4 7019a 1.9 7020a 1.5 No. wear resistance weight loss by wear (mg/100000rot.) 7021a 1.3 7022a 0.9 7023a 1.2 7024a 1.0 7025a 2.3 7026a 1.7 7027a 1.8 7028a 1.1 7029a 1.5 7030a 1.4 No. wear resistance weight loss by wear (mg/100000rot.) 8001a 1.4 8002a 1.1 8003a 0.9 8004a 1.2 8005a 1.8 8006a 1.3 8007a 1.5 8008a 1.0 8009a 1.2 8010a 0.7 8011a 1.0 8012a 1.3 8013a 1.4 8014a 1.3 8015a 1.5 8016a 0.9 8017a 1.4 8019a 0.9 8019a 1.0 8020a 1.5 No. wear resistance weight loss by wear (mg/100000rot.) 8021a 1.0 8022a 1.4 8023a 1.4 8024a 0.8 8025a 1.2 8026a 1.4 8027a 1.9 8028a 0.9 8029a 1.4 8130a 2.2 8131a 2.1 8132a 1.0 8133a 2.4 8134a 1.4 8135a 1.2 8136a 1.5 8137a 1.3 8138a 0.8 8139a 1.4 8140a 1.5 No. wear resistance weight loss by wear (mg/100000rot.) 8041a 1.5 8042a 1.3 8043a 1.6 8044a 1.2 8045a 1.0 8046a 2.0 8047a 1.6 8048a 1.7 8049a 1.3 8050a 1.5 8051a 1.0 8052a 1.5 8053a 1.3 8054a 1.2 8055a 0.7 8056a 0.9 8057a 1.6 8058a 2.4 8059a 1.6 8060a 1.9 No. wear resistance weight loss by wear (mg/100000rot.) 8061a 1.6 8062a 1.9 8063a 1.2 8064a 1.7 8065a 2.0 8066a 1.4 8067a 1.5 8068a 1.2 8069a 0.9 8070a 1.0 8071a 1.7 8072a 1.9 8073a 1.6 8074a 1.6 8075a 1.8 8076a 0.8 8077a 1.3 8078a 1.2 8079a 1.4 8080a 1.3 No. wear resistance weight loss by wear (mg/100000rot.) 8081a 1.6 8082a 1.3 8083a 1.0 8084a 1.2 8085a 1.5 8086a 1.6 8087a 1.1 8088a 2.0 8089a 1.4 8090a 1.2 8091a 1.5 8092a 1.6 8093a 2.1 8094a 1.5 8095a 1.9 8096a 1.5 8097a 1.5 8098a 1.4 8099a 1.1 8100a 0.9 No. wear resistance weight loss by wear (mg/100000rot.) 8101 1.4 8102 1.3 8103 0.8 8104 0.8 8105 0.7 8106 0.9 8107 1.2 8108 1.1 8109 1.0 8110 0.7 8111 0.8 8112 1.2 8113 0.9 8114 1.2 8115 1.1 8116 1.4 8117 1.1 8118 0.9 8119 1.1 8120 0.9 No. wear resistance weight loss by wear (mg/100000rot.) 8121a 1.0 8122a 1.0 8123a 1.2 8124a 0.8 8125a 1.1 8126a 0.9 8127a 1.3 8128a 1.4 8129a 1.3 8130a 1.5 8131a 1.2 8132a 1.3 8133a 0.8 8134a 1.0 8135a 0.8 8136a 1.3 8137a 1.1 8138a 0.9 8139a 1.2 8140a 1.0 No. wear resistance weight loss by wear (mg/100000rot.) 8141a 1.4 8142a 1.8 8143a 1.6 8144a 1.9 8145a 1.1 8146a 1.2 8147a 1.4 No. wear resistance weight loss by wear (mg/100000rot.) 14001a 500 14002a 620 14003a 520 14004a 450 14005a 25 14006a 600

Claims: A lead-free, free-cutting copper alloy which comprises 69 to 79 wt% copper; 2.0 to 4.0 wt% silicon; 0.1 to 1.5 wt% aluminum; and 0.02 to 0.25 wt% phosphorus; and the remaining wt% zinc, and wherein the copper alloy optionally further includes one of: a) at least one element selected from among 0.02 to 0.4 wt% chromium and 0.02 to 0.4 wt% titanium; or b) at least one element selected from among 0.02 to 0.4 wt% bismuth, 0.02 to 0.4 wt% tellurium and 0.02 to 0.4 wt% selenium; or c) at least one element selected from among 0.02 to 0.4 wt% chromium, and 0.02 to 0.4 wt% titanium; and at least one element selected from among 0.02 to 0.4 wt% bismuth, 0.02 to 0.4 wt% tellurium and 0.02 to 0.4 wt% selenium. A lead-free free-cutting copper alloy as defined in claim 1, which is subjected to a heat treatment for 30 minutes to 5 hours at 400 to 600°C.

Inventors: OISHI KEIICHIRO, OISHI, KEIICHIRO, OISHI, Keiichiro, Sambo Copper Alloy Co., Ltd
Applicants: SAMBO COPPER ALLOY CO LTD, SAMBO COPPER ALLOY CO., LTD
Application year: 1998
Main classification: C22C9
IPC codes: C22F1, C22C9