Source: http://www.scribd.com/doc/189600433/A10
Timestamp: 2014-11-29 09:19:46
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P. 1A10A10Ratings: (0)|Views: 6
|Likes: 0Published by Charlie ChongMore info:Published by: Charlie Chong on Dec 05, 2013Copyright:Attribution Non-commercialAvailability:Read on Scribd mobile: iPhone, iPad and Android.download as PDF, TXT or read online from ScribdFlag for inappropriate content|Add to collectionSee moreSee lesshttps://www.scribd.com/doc/189600433/A1012/05/2013pdftextoriginal Designation: A 1020/A 1020M – 01
Steel Tubes, Carbon and Carbon Manganese, FusionWelded, for Boiler, Superheater, Heat Exchanger andCondenser Applications
This standard is issued under the ﬁxed designation A 1020/A 1020M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon (
1.1 This speciﬁcation covers minimum wall thicknesswelded tubes made from carbon and carbon manganese steelslisted in Table 1, with various grades intended for use in boiler,superheater, heat exchanger or condenser applications.1.2 The tubing sizes and thicknesses usually furnished tothis speciﬁcation are
in. [6.3 mm] to 5 in. [127 mm] inoutside diameter and 0.015 to 0.375 in. [0.4 to 9.5 mm],inclusive, in wall thickness. Tubing having other dimensionsmay be furnished provided such tubes comply with all otherrequirements of this speciﬁcation.1.3 Mechanical property requirements do not apply totubing smaller than
in. [3.2 mm] in inside diameter or 0.015in. [0.4 mm] in thickness.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard. Within the text, theSI units are shown in brackets. The values stated in eachsystem are not exact equivalents; therefore, each system mustbe used independently of the other. Combining values from thetwo systems may result in nonconformance with the speciﬁ-cation. The inch-pound units shall apply unless the “M”designation of the speciﬁcation is speciﬁed in the order.1.5 Optional supplementary requirements are provided andwhen desired, shall be so stated on the purchase order.1.6
This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica-bility of regulatory requirements prior to use.
A 450/A 450M Speciﬁcation for General Requirements forCarbon, Ferritic Alloy, and Austenitic Alloy Steel TubesE 213 Practice for Ultrasonic Examination of Metal Pipeand TubingE 273 Practice for Ultrasonic Examination of LongitudinalWelded Pipe and Tubing
3.1 Orders for material under this speciﬁcation shouldinclude the following, as required, to describe the desiredmaterial adequately:3.1.1 Quantity (feet, meters, or number of lengths.3.1.2 Name of material (welded tubes).3.1.3 Grade (Table 1).3.1.4 Size (outside diameter and minimum wall thickness).3.1.5 Length (speciﬁc or random).3.1.6 Optional requirements (product analysis, hydrostaticor nondestructive electric test, crush test and bar coding).3.1.7 Test report required (see Certiﬁcation Section of Speciﬁcation A 450/A 450M).3.1.8 Speciﬁcation designation.3.1.9 Optional supplementary requirements are providedand when desired, shall be designated on the order.
4.1 Material furnished under this speciﬁcation shall con-form to the applicable requirements of the current edition of Speciﬁcation A 450/A 450M, unless otherwise providedherein.
5.1 All steels shall be killed.5.2 The tubes shall be made by an automatic fusion weldingprocess with no addition of ﬁller metal.
6.1 After welding, all tubes shall be heat treated at atemperature of 1650°F [900°C] or higher and followed bycooling in air or in the cooling chamber of a controlledatmosphere furnace. Cold drawn tubes shall be heat treated
This speciﬁcation is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.09on Carbon Steel Tubular Products.Current edition approved June 10, 2001. Published August 2001.
Element Grade ALow CarbonSteelGrade CMedium CarbonSteelGrade DCarbon ManganeseSteelCarbon 0.06–0.18 0.30 max 0.27 maxManganese 0.27–0.63 0.80 max 1.00–1.50Phosphorus 0.035 max 0.035 max 0.030 maxSulfur 0.035 max 0.035 max 0.015 maxSilicon No Requirement No Requirement 0.10 min
after the ﬁnal cold-draw pass at a temperature of 1200°F[650°C] or higher.
7.1 The steel shall conform to the requirements as tochemical composition prescribed in Table 1.7.2 When a grade is ordered under this speciﬁcation, sup-plying an alloy grade that speciﬁcally requires the addition of any element other than those listed in Table 1 is not permitted.
8.1 For the purpose of product analysis, a lot consists of 250pieces for sizes up to and including 3 in. [76.2 mm] OD and100 pieces for sizes over 3 in. [76.2 mm] OD; or when tubesare identiﬁed by heat number, all tubes within that heat.8.2 When requested on the purchase order, a product analy-sis shall be made by the manufacturer or supplier from one tubeper lot. The chemical composition thus determined shallconform to the requirements speciﬁed.8.3 If the original test for product analysis fails, retest of twoadditional tubes per lot shall be made. Both retests, for theelements in question, shall meet the requirements of thespeciﬁcation; otherwise all remaining material in the heat or lotshall be rejected; or at the option of the producer, each tubemay be individually tested for acceptance and those pieces thatdo not meet the requirements of the speciﬁcation shall berejected.
9.1 The term lot for tension and hardness tests applies to alltubes prior to cutting, of the same speciﬁed outside diameterand wall thickness, which are produced from the same heat of steel. When ﬁnal heat treatment is in a batch-type furnace, a lotshall include only those tubes of the same size and the sameheat which are heat treated in the same furnace charge. Whenthe ﬁnal heat treatment is in a continuous furnace, a lot shallinclude all tubes of the same size and heat, heat treated in thesame furnace, at the same temperature, time at heat, andfurnace speed.9.2 For Grade A tubes, hardness test shall be made onspecimens from each of two tubes from each lot and shall nothave a hardness number exceeding 72 HRB.9.3 Grade C and D tubes, one tension test shall be made onspecimens from each of two tubes from each lot and shallconform to properties prescribed in Table 2.9.4 Table 3 gives the computed minimum elongation valuesfor each
-in, [0.8-mm] decrease in wall thickness. Where thewall thickness lies between two values shown above. Theminimum elongation value shall be determined by the follow-ing equation:
E = elongation in 2 in. or 50 mm, min, %, and
t = actual wall thickness of specimen, in. [mm].
10. Crush Test
10.1 Where speciﬁed in the purchase order, crushing testsshall be made. The test specimens shall be sections of tubehaving a length that is at least 2
times the speciﬁed outsidediameter of the tube for tubes that are less than 1 in. [25.4 mm]in speciﬁed outside diameter, and at least 2
in. [63 mm] fortubes that are 1 in. [25.4 mm] or larger in speciﬁed outsidediameter. Slight surface checks shall not be cause for rejection.The test specimens shall withstand crushing longitudinallywithout cracking, splitting, or opening at the weld, as follows:
Wall Thickness of Tubes,in. [mm]Height of Crushed Section,in. [mm]Grade A Tubes Grades C and D Tubes0.135 in. [3.4] and under
in. [19] or until outsidefolds are in contactCrush tests not requiredOver 0.135 in. [3.4] 1
11.1 For mechanical tests, a lot consists of 250 tubes forsizes up to and including 3 in. [76.2 mm] and 100 tubes forsizes over 3 in. [76.2 mm], or fraction thereof, prior to cutting.11.2
—One ﬂattening test shall be made onspecimens from each of two tubes from each lot or fractionthereof.11.3
Flange Test :11.3.1 For Grade A, one ﬂange test shall be made onspecimens from each of two tubes from each lot or fractionthereof.11.3.2 For Grades C and D, one ﬂange test shall be made onspecimens from each of two tubes from each lot or fractionthereof. The width of the ﬂange shall not be less than 75 % of that speciﬁed in speciﬁcation A 450/A 450M.11.4
Crush Test —For Grade A, where speciﬁed in thepurchase order, one crush test shall be made on specimens fromeach of two tubes from each lot or fraction thereof.
Grade C Grade DTensile strength, min, ksi, [MPa] 60 [415] 70 [485]Yield strength, min, ksi, [MPa] 37 [255] 40 [275]Elongation in 2 in. or 50 mm, min % 30 30For elongation strip tests, a deduction for each
-in. [0.8mm] decrease in wall thickness below
in. [8 mm] fromthe basic minimum elongation of the following percentagepoints shall be made.1.50
See Table 3 for the computed minimum values.Note—For the purposes of design, the following tensile properties may beassumed for Grade A tubes:Tensile strength, min, ksi, [MPa] 47 [325]Yield strength, min, ksi, [MPa] 26 [180]Elongation in 2 in. or 50 mm, min, % 35
Wall Thickness Elongation in 2 in. or50 mm, min, %
(0.312) 8 30
(0.281) 7.2 29
(0.250) 6.4 27
(0.219) 5.6 26
(0.188) 4.8 24
(0.156) 4 22
(0.125) 3.2 21
(0.094) 2.4 20
(0.062) 1.6 18
Calculated elongation requirements shall be rounded to the nearest wholenumber.
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