1、Designation: A351/A351M 15Standard 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 PartsE165 Practice for Liquid Penetrant Examination for GeneralIndustryE709 Guide for Magnetic Particle Testing2.2 Manufacturers Standardization Society of the Valve andFittings Industry Standard:4SP-55 Quality Standard for Steel Castings for Valves,Flanges, and Fittings and Oth
12、er Components (VisualMethod)3. General Conditions for Delivery3.1 Other than investment castings Material 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 tocompl
13、y with the general requirements of Specification A703/A703M constitutes nonconformance with this specification. Incase of conflict between the requirements of this specificationand Specification A703/A703M, this specification shall pre-vail.1This specification is under the jurisdiction of ASTM Commi
14、ttee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved Sept. 1, 2015. Published September 2015. Originallyapproved in 1952. Last previous edition approved in 2014 as A351/A351M 14.DOI: 10.1520/A0351_A0351M-15.2
15、For 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, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, r
16、efer to the standards Document Summary page onthe ASTM website.4Available from Manufacturers Standardization Society of the Valve and FittingsIndustry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http:/www.mss-.*A Summary of Changes section appears at the end of this standardCopyright ASTM Intern
17、ational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2 Investment Castings Material furnished to this speci-fication shall conform to the requirements of SpecificationA985/A985M, including any supplementary requirements thatare indicated in the purchase orde
18、r. Failure to comply with thegeneral requirements of Specification A985/A985M consti-tutes nonconformance with this 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
19、 requirements of Supple-mentary Requirement S11 may be specified when austeniticcastings other than HK, HT, or CT15C 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 n
20、umber ordrawing (dimensional tolerances shall be included on thecasting drawing),4.1.2 Grade of steel,4.1.3 Options 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 wit
21、hout separate refining such as argon-oxygen decar-burization (AOD).6. Heat Treatment6.1 All castings shall receive 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 usual
22、ly necessary toenhance corrosion resistance and in some cases to meet mechanicalproperties. Minimum heat-treat temperatures 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 e
23、nhance the corrosion resistance and meet mechanical properties.7. Chemical Composition7.1 The steel shall conform 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 presc
24、ribed in Table 3.9. Quality9.1 The surface of the casting shall be examined visuallyand shall be free of adhering 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 use
25、d to define acceptable surfacediscontinuities and finish. Unacceptable visual surface discon-tinuities shall be removed 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 Th
26、e castings shall not be peened, plugged, or impreg-nated to stop leaks.10. Repair by Welding10.1 Repairs shall be 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 casting
27、sare produced with Supplementary Requirement S5 specified,weld repairs on castings that have leaked on hydrostatic 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 cavit
28、yprepared for welding is greater than approximately 10 in.265cm2, shall be radiographed to the same standards that are usedto inspect the castings. When castings are produced withSupplementary Requirement S6 specified, weld repairs shall beinspected by liquid penetrant examination to the same stan-d
29、ards that are used to inspect the castings.10.3 For Grade HG10MNN, the filler metal to be used shallbe established 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 purchase
30、r should so indicate inhis order and such castings should be solution-heat treated following allweld repairs.11. Keywords11.1 austenitic stainless steel; pressure containing parts;stainless steel; steel castingsTABLE 1 Heat-Treatment RequirementsGradeTemperature, minF CHK30, HK40, HT30, CT15C, HG10M
31、NN as-cast as-castCF3, CF3A, CF8, CF8A, CF3M,CF3MA, CF8M, CF3MN, CG3M, CF10,CF10M, CG8M1900 1040CF10SMnN, CF8C, CF10MC 1950 1065CN7M, CG6MMN 2050 1120CH8, CH10, CH20, CK20 2100 1150CK3MCuN, CN3MNB2200 1200CE20NA2225 1220AGrade shall be quenched in water or the castings may be furnace cooled to2050F
32、1120C minimum, held for 15 min minimum and then quenched in wateror rapidly cooled by other means.BCastings of these grades shall be held at the specified temperature for aminimum of 4 hours.A351/A351M 152TABLE 2 Chemical RequirementsNOTE 1CE8MN and CD3MWCuN have been deleted from this specification
33、 and added to Specification A995/A995M as Grades 2A and 6Arespectively. CD4MCu has also been removed. Specification A995/A995M Grade 1B, CD4MCuN, is an acceptable substitute.Element, %(max, ex-cept whererange isgiven)CF3,CF3AJ92700CF8,CF8AJ92600CF3M,CF3MAJ92800CF8MJ92900CF3MNJ92804CF8CJ92710CF10J929
34、50CF10MJ92901CH8J93400CH10J93401CH20J93402CK20J94202HG10MNNJ92604HK30J94203HK40J94204Carbon 0.03 0.08 0.03 0.08 0.03 0.08 0.04 0.04 0.08 0.04 0.04 0.04 0.07 0.25 0.350.10 0.10 0.10 0.20 0.20 0.11 0.35 0.45Manganese 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 1.50 3.0 1.50 1.505.0Silicon 2
35、.00 2.00 1.50 1.50 1.50 2.00 2.00 1.50 1.50 2.00 2.00 1.75 0.70 1.75 1.75Sulfur 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.030 0.040 0.040Phosphorus 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040 0.040Chromium 17.0 18.0 17.0 18.0 17
36、.0 18.0 18.0 18.0 22.0 22.0 22.0 23.0 18.5 23.0 23.021.0 21.0 21.0 21.0 21.0 21.0 21.0 21.0 26.0 26.0 26.0 27.0 20.5 27.0 27.0Nickel 8.012.08.011.09.013.09.012.09.013.09.012.08.011.09.012.012.015.012.015.012.015.019.022.011.513.519.022.019.022.0Molybde- 0.50 0.50 2.0 2.0 2.0 0.50 0.50 2.0 0.50 0.50
37、0.50 0.50 0.25 0.50 0.50num 3.0 3.0 3.0 3.0 0.45Columbium . . . . . . . . . . . . . . .A. . . . . .C. .(niobium)Vanadium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Nitrogen . . . . . . . . . . . . 0.10 . . . . . . . . . . . . . . . . . . . . . 0.20 . . .
38、 . . .0.20 0.30Copper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.50 . . . . . .Element, %(max, ex-cept whererange isgiven)HT30N08030CF10MCCN7MN08007CN3MNJ94651CG-6MMNJ93790CG8MJ93000CF10S-MnNJ92972CT15CN08151CK-3MCuNJ93254CE20NJ92802CG3MJ92999Carbon 0.25 0.10 0.07 0.03
39、 0.06 0.08 0.10 0.05 0.025 0.20 0.030.35 max 0.15Manganese 2.00 1.50 1.50 2.00 4.0 1.50 7.00 0.15 1.20 1.50 1.50max 6.0 9.00 1.50Silicon 2.50 1.50 1.50 1.00 1.00 1.50 3.50 0.50 1.00 1.50 1.50max 4.50 1.50Sulfur 0.040 0.040 0.040 0.010 0.030 0.04 0.030 0.03 0.010 0.040 0.04maxPhosphorus 0.040 0.040 0
40、.040 0.040 0.040 0.04 0.060 0.03 0.045 0.040 0.04maxChromium 13.0 15.0 19.0 20.0 20.5 18.0 16.0 19.0 19.5 23.0 18.017.0 18.0 22.0 22.0 23.5 21.0 18.0 21.0 20.5 26.0 21.0Nickel 33.037.013.016.027.530.523.525.511.513.59.013.08.09.031.034.017.519.58.011.09.013.0Molybde- 0.50 1.75 2.0 6.0 1.50 3.0 . . .
41、 . . . 6.0 0.50 3.0num 2.25 3.0 7.0 3.00 4.0 7.0 4.0Columbium . . .B. . 0.10 . . 0.50 . . .(niobium) 0.30 1.50Vanadium . . . . . . . . . . . . 0.10 . . . . . . . . . . . . . . . . . .0.30Nitrogen . . . . . . . . . 0.18 0.20 . . . 0.08 . . . 0.18 0.08 . . .0.26 0.40 0.18 0.24 0.20Copper . . . . . . 3
42、.04.00.75max. . . . 0.501.00. .AGrade CF8C shall have a columbium content of not less than 8 times the carbon content but not over 1.00 %.BGrade CF10MC shall have a columbium content of not less than 10 times the carbon content but not over 1.20 %.CGrade HG10MNN shall have a columbium content of not
43、 less than 8 times the carbon, but not over 1.00 %.A351/A351M 153SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless specified in the purchase order. Alist of standardized supplementary requirements for use at the option of the purchaser is included inSpecificat
44、ions 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 upon agreement between the manufacturer andpurchaser.S2. Destruction TestsS5
45、. 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 repairs, shall begiven a post-weld solution heat treatment.S11.2 The post-weld tre
46、atment for grades CK3MCuN andCN3MN shall be as specified in Table 1 except that theminimum soak time for castings that have already been heattreated according to Table 1 may be 1 hour.S33. Stabilization Heat Treatment of CF8CS33.1 CF8C shall be stabilized at 1600-1650F (870-900C) for a minimum time
47、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 stabilized at 1600-1650F (870-900C) for a minimum time of 1 h/in. (25 mm) of thicknes
48、s andwater quenched or rapidly cooled by other means. The gradedesignation symbol shall be followed by the symbol “S34.”TABLE 3 Tensile RequirementsCF3J92700CF3AJ92700CF8J92600CF8AJ92600CF3MJ92800CF-3MAJ92800CF8MJ92900CF-3MNJ92804CF8CJ92710CF10J92950CF10MJ92901CH8J93400CH10J93401CH20J93402CK20J94202
49、HG10MNNJ92604HK30J94203HK40J94204Tensile strength, 70 77 70 77 70 80 70 75 70 70 70 65 70 70 65 76 65 62min, ksi MPa 485 530 485 530 485 550 485 515 485 485 485 450 485 485 450 525 450 425Yield strength,A30 35 30 35 30 37 30 37 30 30 30 28 30 30 28 33 35 35min, ksi MPa 205 240 205 240 205 255 205 255 205 205 205 195 205 205 195 225 240 240Elongation in2 in. or50 mm,Bmin, %35 35 35 35
