1、Designation: A579/A579M 04a (Reapproved 2014)Standard Specification forSuperstrength Alloy Steel Forgings1This standard is issued under the fixed designation A579/A579M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers requirements for forged steelshapes for highly stressed structural members requiring yieldstr
3、engths in excess of 140 ksi 965 MPa.1.2 This specification is not intended for applications lim-ited by creep deformation.1.3 Twenty-seven grades are covered by this specification.Selection will depend upon design, service conditions, andmechanical properties required.1.4 Supplementary requirements
4、are provided for use whenadditional testing or inspection is desired. These shall applyonly when specified individually by the purchaser in the order.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exac
5、t equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.6 Unless the order specifies the applicable “M” specifica-tion designation, the material shall be furnished to the inch-pound units.2.
6、Referenced Documents2.1 ASTM Standards:2A255 Test Methods for Determining Hardenability of SteelA275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA388/A388M Practice for Ultrasonic Examination of SteelForgin
7、gsA788/A788M Specification for Steel Forgings, General Re-quirementsE3 Guide for Preparation of Metallographic SpecimensE21 Test Methods for Elevated Temperature Tension Tests ofMetallic MaterialsE45 Test Methods for Determining the Inclusion Content ofSteelE112 Test Methods for Determining Average
8、Grain SizeE165/E165M Practice for Liquid Penetrant Examination forGeneral Industry3. Ordering Information and General Requirements3.1 In addition to the ordering information required bySpecification A788/A788M, the purchaser shall include withthe inquiry and order a detailed drawing, sketch, or writ
9、tendescription of the forging.3.2 Material supplied to this specification shall conform tothe requirements of Specification A788/A788M, which out-lines additional ordering information, manufacturingrequirements, testing and retesting methods and procedures,marking, certification, product analysis va
10、riations, and addi-tional supplementary requirements.3.3 If the requirements of this specification are in conflictwith the requirements of Specification A788/A788M, therequirements of this specification shall prevail.4. Materials and Manufacture4.1 The steel shall be made in accordance with the Melt
11、ingProcess Section of Specification A788/A788M. A sufficientdiscard shall be made to secure freedom from injurious pipeand undue segregation.4.2 The material shall be forged as close as practical to thespecified shape and size.4.3 The finished product shall be a hot-worked forging asdefined by Speci
12、fication A788/A788M.4.4 Heat Treatment Performed by Forging SupplierForgings may be furnished in one of the following conditionsas specified in the inquiry and purchase order (some conditionsare not applicable to all grades):4.4.1 Stress relieved,4.4.2 Annealed,4.4.3 Solution treated,4.4.4 Solution
13、treated and aged,4.4.5 Normalized,1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved Oct. 1, 2014. Published October 2014. Origin
14、allyapproved in 1967. Last previous edition approved in 2009 as A579/A579M 04a(2009). DOI: 10.1520/A0579_A0579M-04AR14.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer
15、to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.4.6 Normalized and tempered, or4.4.7 Quenched and tempered.4.5 Heat Treatment Performed by PurchaserWhen finalheat treatment i
16、s to be performed by the purchaser aftermachining or fabrication, or both, a capability heat treatmentduplicating the purchasers final heat treatment must be per-formed by the supplier on representative samples (see 6.3)toqualify the forgings. The results of these capability tests shallconform to th
17、e requirements of Table 1 and Table 2. See alsoTable 3.5. Chemical Requirements5.1 Heat AnalysisThe heat analysis obtained from sam-pling in accordance with Specification A788/A788M shallcomply with Table 4.5.2 Product AnalysisThe product analysis provisions ofSpecification A788/A788M may be used by
18、 the purchaser.6. Mechanical Properties6.1 The material shall conform to the mechanical propertiesspecified in Table 1, when ordered to 4.4.4 or 4.4.7. For theother heat treatments specified in 4.4, the provisions of 4.5apply.6.2 Tension tests are required for all material ordered to thisspecificati
19、on. However, room-temperature Charpy V-notch im-pact tests are required only for those grades which haveminimum impact strength requirements listed in Table 2.6.3 Tests shall be conducted in accordance with the latestissue of Test Methods and Definitions A370. The largestobtainable tension test spec
20、imen as specified in Test Methodsand Definitions A370 shall be used. Impact specimens shall bethe standard size, Charpy V-notch, as shown in the figure forthe Charpy (Simple-Beam) Impact Test of Test Methods andDefinitions A370. The use of subsize impact specimens re-quires prior purchaser approval.
21、TABLE 1 Minimum Tension Test RequirementsGrade Yield Strength(0.2 % offset),ksi MPaTensile Strength,ksi MPaElongationA,%Reductionof AreaA,%Quench and Tempered13, 21, 22, 23, 12, 12a 140 965 150 1035 13 4013, 21, 22, 23, 11 160 1100 175 1210 12 3613, 21, 22, 23, 31 180 1240B190 1310 10 3213, 21, 22,
22、23 200 1380B210 1450 9 2822C, 23, 32, 33 225 1550B250 1720 6 25Air Hardening41 200 1380B260 1790 9 3041 225 1550B280 1930 8 25Martensitic Stainless51, 52, 53 140 965 175 1210 12 4552 160 1100 220 1520 10 40No. 1 Precipitation Hardening Stainless61 140 965 165 1140 12 5061 160 1100 180 1240 10 4561 1
23、80 1240B200 1380 8 40No. 2 Precipitation Hardening Stainless64 140 965 165(1140 12 2564 160 1100 185 1275 10 2564 180 1240B210 1450 10 25No. 3 Precipitation Hardening Stainless62 140 965 165 1140 6 2562, 63 160 1100 180 1240 6 2563 180 1240B200 1380 6 2563 200 1380B225 1550 5 25Maraging Steels74 160
24、 1100 170 1170 15 6575 180 1240B190 1310 14 6071 200 1380B210 1450 12 5572 250 1720B255 1760 10 4573 275 1895B280 1930 9 40Miscellaneous81 180 1240D190 1310 13 4582 200 1380D210 1450 10 3083D225 1550D260 1790 7 2083E250 1720D280 1930 4 1584 180 1240D185 1275 14 45ASee Note in Table 3.BVacuum melting
25、 normally required to achieve list properties.CBy agreement.DBainitic.EMartensitic.A579/A579M 04a (2014)2TABLE 2 Minimum Room-Temperature Charpy V-Notch Energy AbsorptionAfor Respective Yield Strength Classes, ftlbf JGrade Yield Strength Class, ksi MPa1409651601100180B1240200B1380225B1550250B1720275
26、B190011 . 4560 . . . . .12,12a 5070 . . . . . .13 20 25 10 15C. . . .21 35 45 30 40 20 25 15 20 . . . . . . . . .22 30 40 25 35 20 25 15 20 . . . . . . . . .23 35 45 25 35 20 25 15 20 10 15 . . . . . .31 . . 2535 . . . .32 . . . . 1217 . .33 . . . . 1520 . .41 . . . 1520C. .51 1520 . . . . . .52CC.
27、. . . .53C. . . . . .61 25 35 . . .C. . . .62CC. . . . .63CCC. . . .64 25 35 15 20 15 20 . . . . . . . . . . . .71 . . . 3545 . . .72 . . . . . 2025 .73 . . . . . . 152074 . 6080 5070 . . . .81 . . 2535 . . . .82 . . . 2025 . . .83 . . . . 1520 1015 .84 . . 2535 . . . .ASee Note in Table 3.BVacuum m
28、elting may be required to achieve listed properties.CBy agreement.TABLE 3 Material, Maximum Annealed Hardness (HB), and Section Size Capability in Inches mm forRespective Yield Strength ClassesNOTE 1Tables 1-3 show grades and maximum section sizes in which the indicated yield strength levels can usu
29、ally be achieved at a 1/4 thicknessdepth in the direction of maximum working. Because of variations in forging configuration and processing it does not follow that the ductility and impactstrengths listed in Table 1 and Table 2 can always be obtained at these depths. The properties listed are minimu
30、ms, unless otherwise agreed by purchaserand manufacturer.Grade MaximumAnnealedHardness(HB)Yield Strength Class, ksi MPa14096516011001801240200138022515502501720275190011 321 . . . 6.5 165 . . . . . . . . . . . . . . .12, 12a . . . 4.0 100 . . . . . . . . . . . . . . . . . .13 229 1.0 25 1.0 25 1.0 2
31、5 . . . . . . . . . . . .21 285 4.5 115 4.5 115 4.0 100 4.0 100 . . . . . . . . .22 302 4.5 115 4.5 115 4.0 100 4.0 100 3.5 90 . . . . . .23 302 8.0 200 8.0 200 8.0 200 8.0 200 8.0 200 . . . . . .31 262 . . 3.075 . . . .32 302 . . . . . . . . . . . . 5.5 140 . . . . . .33 302 . . . . 2.050 . .41 235
32、 . . . . . . . . . 6.0 150 6.0 150 . . . . . .51 197 2.050 . . . . . .52 255 2.0 50 2.0 50 . . . . . . . . . . . . . . .53 285 4.0 100 . . . . . . . . . . . . . . . . . .61 375 8.0 200 8.0 200 1.0 25 . . . . . . . . . . . .62 207 6.0 150 6.0 150 . . . . . . . . . . . . . . .63 241 . . . 6.0 150 6.0
33、150 6.0 150 . . . . . . . . .64 321 6.0 150 6.0 150 6.0 150 . . . . . . . . . . . .71 321 . . . . . . . . . 12.0 300 . . . . . . . . .72 321 . . . . . . . . . . . . . . . 12.0 300 . . .73 321 . . . . . . . . . . . . . . . . . . 12.0 30074 321 . . . 12.0 300 . . . . . . . . . . . . . . .75 321 . . .
34、. . . 12.0 300 . . . . . . . . . . . .81 341 . . . . . . 6.0 150 . . . . . . . . . . . .82 341 . . . . . . . . . 5.0 125 . . . . . . . . .83 341 . . . . . . . . . . . . 3.0 75 3.0 75 . . .84 341 . . . . . . 6.0 150 . . . . . . . . . . . .A579/A579M 04a (2014)36.4 The longitudinal axis of the specime
35、ns shall be parallelto the direction of major working of the forging. For upset-discforgings, the longitudinal axis of the test specimen shall be inthe tangential direction.6.4.1 The longitudinal axis of the specimen shall be locatedmidway between the parallel surfaces of the test extension ifadded
36、to the periphery of disks or midway between the centerand surface of solid forgings. For hollow forgings, the longi-tudinal axis of the specimens shall be located midway betweenthe center and outer surfaces of the wall. When separatelyforged test blocks are employed as defined in 6.4.3, the tensiont
37、est specimens shall be taken from a location which representsthe midwall of the heaviest section of the production forgings.When specimens are required from opposite ends, they shall betaken from the diagonal corners of an axial plane.6.4.2 Except as specified herein, tests for acceptance shallbe ma
38、de after heat treatment has been completed.6.4.3 When mutually agreed upon between manufacturerand purchaser, test specimens may be machined from aspecially forged block suitably worked and heat treated withTABLE 4 Chemical RequirementsElements Composition, %min max min max min max min max min max m
39、in max min maxGrade 11 12 12a 13 21 22 23Carbon 0.23 0.28 . . . 0.12 . . . 0.20 0.27 0.33 0.31 0.38 0.38 0.43 0.45 0.50Manganese . . . 0.20 0.60 0.90 0.60 0.90 0.40 0.60 0.60 0.90 0.60 0.90 0.60 0.90Phosphorus . . . 0.01 . . . 0.010 . . . 0.015 . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.015Sulfur .
40、 . . 0.01 . . . 0.010 . . . 0.015 . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.015Silicon . . . 0.10 0.20 0.35 0.20 0.35 0.20 0.35 0.20 0.35 0.20 0.35 0.15 0.30Nickel 2.75 3.25 4.75 5.25 4.75 5.25 . . . . . . 1.65 2.00 1.65 2.00 0.40 0.70Chromium 1.40 1.65 0.40 0.70 0.40 0.70 0.80 1.10 0.65 0.90 0.70
41、 0.90 0.90 1.20Molybdenum 0.8 1.0 0.30 0.65 0.30 0.65 0.15 0.25 0.30 0.60 0.30 0.60 0.90 1.10Vanadium . . . . . . 0.05 0.10 0.05 0.10 0.05 0.10 0.17 0.23 0.05 0.10 0.08 0.15Columbium 0.03 0.07 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Grade 31 32 33 41 51 52 53ACarbon 0.
42、23 0.28 0.40 0.45 0.41 0.46 0.38 0.43 . . . 0.15 0.20 0.25 . . . 0.20Manganese 1.20 1.50 0.65 0.90 0.75 1.00 0.20 0.40 . . . 1.00 0.50 1.00 . . . 1.00Phosphorus . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.015 . . . 0.025 . . . 0.025 . . . 0.025Sulfur . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.015 .
43、 . . 0.025 . . . 0.025 . . . 0.025Silicon 1.30 1.70 1.45 1.80 1.40 1.75 0.80 1.00 . . . 1.00 . . . 0.50 . . . 1.00Nickel 1.65 2.00 1.65 2.00 . . . . . . . . . . . . . . . 0.75 0.50 1.00 1.25 2.50Chromium 0.20 0.40 0.65 0.90 1.90 2.25 4.75 5.25 11.5 13.5 11.0 12.5 15.0 17.0Molybdenum 0.35 0.45 0.30 0
44、.45 0.45 0.60 1.20 1.40 . . . 0.50 0.90 1.25 . . . . . .Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.50 . . . . . . . . . . . .Titanium . . . . . . . . . . . 0.05 . .Vanadium . . . . . . . . . . . . 0.03 0.08 0.40 0.60 . . . . . . 0.20 0.30 . . . . . .Cobalt . . . . . . . . . . . .
45、 . . . . . . . . . . . . . . . . . . . . . 0.25 . . . . . .Aluminum . . . . . . . . . 0.05 . 0.05 . .Tungsten . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.90 1.25 . . . . . .Tin . . . . . . . . . 0.05 . 0.04 . .Grade 61A,B62A,B63A,B64A,B71A,B72A,B73A,BCarbon . . . 0.07 . . . 0.09 .
46、. . 0.09 0.10 0.15 . . . 0.03 . . . 0.03 . . . 0.03Manganese . . . 1.00 . . . 1.00 . . . 1.00 0.50 1.25 . . . 0.10 . . . 0.10 . . . 0.10Phosphorus . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.01 . . . 0.01 . . . 0.01Sulfur . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.025 . . . 0.01 . . . 0
47、.01 . . . 0.01Silicon . . . 1.00 . . . 1.00 . . . 0.50 . . . 0.50 . . . 0.10 . . . 0.10 . . . 0.10Nickel 3.0 5.0 6.5 7.75 6.5 7.75 4.0 5.0 17.0 19.0 17.0 19.0 18.0 19.0Chromium 15.5 17.5 16.0 18.0 14.0 15.25 15.0 16.0 . . . . . . . . . . . . . . . . . .Molybdenum . . . . . . . . . . . . 2.0 2.75 2.5
48、0 3.25 3.0 3.5 4.6 5.2 4.6 5.2Copper 3.0 5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Titanium . . . . . . . . . . . . . . . . . . . . . . . . 0.15 0.25 0.30 0.50 0.50 0.80Columbium 0.15 0.45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Cobalt . . . . . . . . . . . . . . . . . . . . . . . . 8.0 9.0 7.0 8.5 8.5 9.5Aluminum . . . . . . 0.75 1.50 0.75 1.25 . . . . . . 0.05 0.15 0.05 0.15 0.05 0.15Nitrogen . . . . . . . . . . . . . . . . . . 0.07 0.13 . . . . . . . . . . . . . . . . . .Grade 74A
