1、Designation: A351/A351M 16Standard Specification forCastings, Austenitic, for Pressure-Containing Parts1This standard is issued under the fixed designation A351/A351M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This specification2covers austenit
3、ic steel castings forvalves, flanges, fittings, and other pressure-containing parts(Note 1).NOTE 1Carbon steel castings for pressure-containing parts are cov-ered by Specification A216/A216M, low-alloy steel castings by Specifi-cation A217/A217M, and duplex stainless steel castings by SpecificationA
4、995/A995M.1.2 A number of grades of austenitic steel castings areincluded in this specification. Since these grades possessvarying degrees of suitability for service at high temperaturesor in corrosive environments, it is the responsibility of thepurchaser to determine which grade shall be furnished
5、. Selec-tion will depend on design and service conditions, mechanicalproperties, and high-temperature or corrosion-resistantcharacteristics, or both.1.2.1 Because of thermal instability, Grades CE20N, CF3A,CF3MA, and CF8A are not recommended for service attemperatures above 800F 425C.1.3 Supplementa
6、ry requirements of an optional nature areprovided for use at the option of the purchaser. The Supple-mentary requirements shall apply only when specified indi-vidually by the purchaser in the purchase order or contract.1.4 The values stated in either SI units or inch-pound unitsare to be regarded se
7、parately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.4.1 This specification is expressed in both inch-poundunits and in
8、 SI units; however, unless the purchase order orcontract specifies the applicable M specification designation(SI units), the inch-pound units shall apply. Within the text, theSI units are shown in brackets or parentheses.2. Referenced Documents2.1 ASTM Standards:3A216/A216M Specification for Steel C
9、astings, Carbon, Suit-able for Fusion Welding, for High-Temperature ServiceA217/A217M Specification for Steel Castings, MartensiticStainless and Alloy, for Pressure-Containing Parts, Suit-able for High-Temperature ServiceA488/A488M Practice for Steel Castings, Welding, Qualifi-cations of Procedures
10、and PersonnelA703/A703M Specification for Steel Castings, GeneralRequirements, for Pressure-Containing PartsA985/A985M Specification for Steel Investment CastingsGeneral Requirements, for Pressure-Containing PartsA995/A995M Specification for Castings, Austenitic-Ferritic(Duplex) Stainless Steel, for
11、 Pressure-Containing Parts2.2 Manufacturers Standardization Society of the Valve andFittings Industry Standard:4SP-55 Quality Standard for Steel Castings for Valves,Flanges, and Fittings and Other Components (VisualMethod)3. General Conditions for Delivery3.1 Other than investment castings Material
12、furnished tothis specification shall conform to the requirements of Speci-fication A703/A703M, including any supplementary require-ments that are indicated in the purchase order. Failure tocomply with the general requirements of Specification A703/A703M constitutes nonconformance with this specifica
13、tion. Incase of conflict between the requirements of this specificationand Specification A703/A703M, this specification shall pre-vail.3.2 Investment Castings Material furnished to this speci-fication shall conform to the requirements of SpecificationA985/A985M, including any supplementary requireme
14、nts thatare indicated in the purchase order. Failure to comply with the1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved May 1, 2016. Published Ma
15、y 2016. Originallyapproved in 1952. Last previous edition approved in 2015 as A351/A351M 15.DOI: 10.1520/A0351_A0351M-16.2For ASME Boiler and Pressure Vessel Code applications, see related Specifi-cation SA-351/SA-351M in Section II of that code.3For referenced ASTM standards, visit the ASTM website
16、, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vi
17、enna, VA 22180-4602, http:/www.mss-.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1general requirements of Specification A985/A985M consti-tutes nonconformance with thi
18、s specification. In case of con-flict between the requirements of this specification and Speci-fication A985/A985M, Specification A985/A985M shallprevail.3.3 The post weld heat treatment requirements of Supple-mentary Requirement S11 may be specified when austeniticcastings other than HK, HT, or CT1
19、5C are to be subjected tosevere corrosive service.4. Ordering Information4.1 The inquiry and order should include or indicate thefollowing:4.1.1 A description of the casting by pattern number ordrawing (dimensional tolerances shall be included on thecasting drawing),4.1.2 Grade of steel,4.1.3 Option
20、s in the specification, and4.1.4 Supplementary requirements desired, including thestandards of acceptance.5. Process5.1 The steel shall be made by the electric furnace processwith or without separate refining such as argon-oxygen decar-burization (AOD).6. Heat Treatment6.1 All castings shall receive
21、 a heat treatment at the tem-perature specified in Table 1, followed by a quench in water orrapid cool by other means except as noted.NOTE 2Proper heat treatment of these alloys is usually necessary toenhance corrosion resistance and in some cases to meet mechanicalproperties. Minimum heat-treat tem
22、peratures are specified; however, it issometimes necessary to heat-treat at higher temperatures, hold for someminimum time at temperature, and then rapidly cool the castings in orderto enhance the corrosion resistance and meet mechanical properties.7. Chemical Composition7.1 The steel shall conform
23、to the requirements as tochemical composition prescribed in Table 2.8. Tensile Properties8.1 Steel used for the castings shall conform to the require-ments as to tensile properties prescribed in Table 3.9. Quality9.1 The surface of the casting shall be examined visuallyand shall be free of adhering
24、sand, scale, cracks, and hot tears.Other surface discontinuities shall meet the visual acceptancestandards specified in the order. Visual Method SP-55 or othervisual standards may be used to define acceptable surfacediscontinuities and finish. Unacceptable visual surface discon-tinuities shall be re
25、moved and their removal verified by visualexamination of the resultant cavities.9.2 When additional inspection is desired, SupplementaryRequirements S5, S6, and S10 may be ordered.9.3 The castings shall not be peened, plugged, or impreg-nated to stop leaks.10. Repair by Welding10.1 Repairs shall be
26、made using procedures and weldersqualified under Practice A488/A488M.10.2 Weld repairs shall be inspected to the same qualitystandards that are used to inspect the castings. When castingsare produced with Supplementary Requirement S5 specified,weld repairs on castings that have leaked on hydrostatic
27、 test, oron castings in which the depth of any cavity prepared for repairwelding exceeds 20 % of the wall thickness or 1 in. 25 mm,whichever is smaller, or on castings in which any cavityprepared for welding is greater than approximately 10 in.265 cm2, shall be radiographed to the same standards tha
28、t areused to inspect the castings. When castings are produced withSupplementary Requirement S6 specified, weld repairs shall beinspected by liquid penetrant examination to the same stan-dards that are used to inspect the castings.10.3 For Grade HG10MnN, the filler metal to be used shallbe establishe
29、d by mutual agreement between the manufacturerand the purchaser.NOTE 3When austenitic steel castings are to be used in services wherethey will be subject to stress corrosion, the purchaser should so indicate inhis order and such castings should be solution-heat treated following allweld repairs.11.
30、Keywords11.1 austenitic stainless steel; pressure containing parts;stainless steel; steel castingsTABLE 1 Heat-Treatment RequirementsGradeTemperature, minF CHK30, HK40, HT30, CT15C, HG10MnN as-cast as-castCF3, CF3A, CF8, CF8A, CF3M,CF3MA, CF8M, CF3MN, CG3M, CF10,CF10M, CG8M1900 1040CF10SMnN, CF8C, C
31、F10MC 1950 1065CN7M, CG6MMnN 2050 1120CH8, CH10, CH20, CK20 2100 1150CK3MCuN, CN3MNB2200 1200CE20NA2225 1220AGrade shall be quenched in water or the castings may be furnace cooled to2050F 1120C minimum, held for 15 min minimum and then quenched in wateror rapidly cooled by other means.BCastings of t
32、hese grades shall be held at the specified temperature for aminimum of 4 hours.A351/A351M 162TABLE2ChemicalRequirementsNOTE1CE8MNandCD3MWCuNhavebeendeletedfromthisspecificationandaddedtoSpecificationA995/A995MasGrades2Aand6Arespectively.CD4MCuhasalsobeenremoved.SpecificationA995/A995MGrade1B,CD4MCuN
33、,isanacceptablesubstituteElement,%(max,exceptwhererangeisgiven)MaterialGradeCarbonManganeseSiliconSulfurPhosphorusChromiumNickelMolybdenumColumbium (Niobium)DVanadiumNitrogenCopperCE20N J928020.201.501.500.0400.04023.026.08.011.00.50.0.080.20.CF3,CF3AJ927000.031.502.000.0400.04017.021.08.012.00.50.C
34、F8,CF8AJ926000.081.502.000.0400.04018.021.08.011.00.50.CF3M,CF3MA J928000.031.501.500.0400.04017.021.09.013.02.03.0.CF8MJ929000.081.501.500.0400.04018.021.09.012.02.03.0.CF3MN J928040.031.501.500.0400.04017.021.09.013.02.03.0.0.100.20.CF8CJ927100.081.502.000.0400.04018.021.09.012.00.50A.CF10J929500.
35、040.101.502.000.0400.04018.021.08.011.00.50.CF10M J929010.040.101.501.500.0400.04018.021.09.012.02.03.0.CF10MC0.101.501.500.0400.04015.018.013.016.01.752.25B.CF10SMnNJ929720.107.009.003.504.500.0300.06016.018.08.09.0.0.080.18.CG3MJ929990.031.501.500.040.0418.021.09.013.03.04.0.CG6MMnNJ937900.064.06.
36、01.000.0300.04020.523.511.513.51.503.000.100.300.100.300.200.40.CG8MJ930000.081.501.500.040.0418.021.09.013.03.04.0.CH8J934000.081.501.500.0400.04022.026.012.015.00.50.CH10J934010.040.101.502.000.0400.04022.026.012.015.00.50.CH20J934020.040.201.502.000.0400.04022.026.012.015.00.50.A351/A351M 163TABL
37、E2ContinuedElement,%(max,exceptwhererangeisgiven)MaterialGradeCarbonManganeseSiliconSulfurPhosphorusChromiumNickelMolybdenumColumbium (Niobium)DVanadiumNitrogenCopperCK20J942020.040.201.501.750.0400.04023.027.019.022.00.50.CK3MCuNJ932540.0251.201.000.0100.04519.520.517.519.56.07.0.0.180.240.501.00CN
38、3MNJ946510.032.001.000.0100.04020.022.023.525.56.07.0.0.180.260.75CN7MN080070.071.501.500.0400.04019.022.027.530.52.03.0.3.04.0CT15CN081510.050.150.151.500.501.500.030.0319.021.031.034.0.0.501.50.HG10MnNJ926040.070.113.05.00.700.0300.04018.520.511.513.50.250.45C.0.200.300.50HK30J942030.250.351.501.7
39、50.0400.04023.027.019.022.00.50.HK40J942040.350.451.501.750.0400.04023.027.019.022.00.50.HT30N080300.250.352.002.500.0400.04013.017.033.037.00.50.AGradeCF8Cshallhaveacolumbium(niobium)contentofnotlessthan8timesthecarboncontentbutnotover1.00%.BGradeCF10MCshallhaveacolumbium(niobium)contentofnotlessth
40、an10timesthecarboncontentbutnotover1.20%.CGradeHG10MnNshallhaveacolumbium(niobium)contentofnotlessthan8timesthecarbon,butnotover1.00%.DColumbium(Cb)andniobium(Nb)arealternatenamesforElement41.A351/A351M 164TABLE 3 Tensile RequirementsMaterial Grade Tensile strength,min, ksi MPaYield strength,Amin, k
41、si MPaElongation in 2 in. or50 mm,Bmin, %CE20N 80 40 30J92802 550 275CF3 70 30 35J92700 485 205CF3A 77 35 35J92700 530 240CF8 70 30 35J92600 485 205CF8A 77 35 35J92600 530 240CF3M 70 30 30J92800 485 205CF3MA 80 37 30J92800 550 255CF8M 70 30 30J92900 485 205CF3MN 75 37 35J92804 515 255CF8C 70 30 30J9
42、2710 485 205CF10 70 30 35J92950 485 205CF10M 70 30 30J92901 485 205CF10MC 70 30 20485 205CF10SMnN 85 42.5 30J92972 585 295CG3M 75 35 25J92999 515 240CG6MMnN 85 42.5 30J93790 585 295CG8M 75 35 25J93000 515 240CH8 65 28 30J93400 450 195CH10 70 30 30J93401 485 205CH20 70 30 30J93402 485 205CK20 65 28 3
43、0J94202 450 195CK3MCuN 80 38 35J93254 550 260CN3MN 80 38 35J94651 550 260CN7M 62 25 35N08007 425 170CT15C 63 25 20N08151 435 170A351/A351M 165SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of standardized supplementary
44、 requirements for use at the option of the purchaser is included inSpecifications A703/A703M and A985/A985M. Those which are ordinarily considered suitable foruse with this specification are given below. Others enumerated in Specifications A703/A703M andA985/A985M may be used with this specification
45、 upon agreement between the manufacturer andpurchaser.S2. Destruction TestsS5. Radiographic InspectionS6. Liquid Penetrant InspectionS10. Examination of Weld PreparationS11. Post Weld Heat TreatmentS11.1 All austenitic castings, except Grades HK, HT, andCT15C, which have been subjected to weld repai
46、rs, shall begiven a post-weld solution heat treatment.S11.2 The post-weld treatment for grades CK3MCuN andCN3MN shall be as specified in Table 3 except that theminimum soak time for castings that have already been heattreated according to Table 3 may be 1 hour.S33. Stabilization Heat Treatment of CF
47、8CS33.1 CF8C shall be stabilized at 1600-1650F (870-900C) for a minimum time of 1 h/in. (25 mm) of thickness andwater quenched or rapidly cooled by other means. The gradedesignation symbol shall be followed by the symbol “S33.”S34. Stabilization Heat Treatment of CF10MCS34.1 CF10MC shall be stabiliz
48、ed at 1600-1650F (870-900C) for a minimum time of 1 h/in. (25 mm) of thickness andwater quenched or rapidly cooled by other means. The gradedesignation symbol shall be followed by the symbol “S34.”TABLE 3 ContinuedMaterial Grade Tensile strength,min, ksi MPaYield strength,Amin, ksi MPaElongation in 2 in. or50 mm,Bmin, %HG10MnN 76 33 20J92604 525 225HK30 65 35 10J94203 450 240HK40 62 35 10J94204 425 240HT30 65 28 15N08030 450 195ADetermine by the 0.2 % offset method.BWhen ICI test bars are used in tensile testing as provided for in SpecificationA995/A995M, the gauge len
