1、Designation: A743/A743M 12A743/A743M 13Standard Specification forCastings, Iron-Chromium, Iron-Chromium-Nickel, CorrosionResistant, for General Application1This standard is issued under the fixed designation A743/A743M; the number immediately following the designation indicates the yearof original a
2、doption or, in the case of revision, the year of last 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 Department of Defense.
3、1. Scope*1.1 This specification covers iron-chromium and iron-chromium-nickel alloy castings for general corrosion-resistant applica-tion. The grades covered by this specification represent types of alloy castings suitable for broad ranges of application which areintended for a wide variety of corro
4、sion environments.NOTE 1For alloy castings for severe corrosion-resistant service, reference should be made to Specification A744/A744M. For general heat-resistantalloy castings, reference should be made to Specification A297/A297M. For nickel alloy castings for corrosion-resistant service, referenc
5、e should be madeto Specification A494/A494M.1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be usedindep
6、endently of the other. Combining values from the two systems may result in nonconformance with the specification.Inch-pound units are applicable for material ordered to Specification A743 and SI units for material ordered to SpecificationA743M.2. Referenced Documents2.1 ASTM Standards:2A262 Practice
7、s for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless SteelsA297/A297M Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, for GeneralApplicationA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA494/A494M Specifi
8、cation for Castings, Nickel and Nickel AlloyA744/A744M Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe ServiceA781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial UseA890/A890M Specification for Castings, Iron-Chromium-
9、Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General ApplicationA957 Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use3. General Conditions for Delivery3.1 Except for investment castings, castings furnished to this spec
10、ification shall conform to the requirements of SpecificationA781/A781M, including any supplementary requirements that are indicated on the purchase order. Failure to comply with thegeneral requirements of Specification A781/A781M constitutes nonconformance with this specification. In case of conflic
11、t betweenthe requirements of this specification and Specification A781/A781M, this specification shall prevail.3.2 Steel investment castings furnished to this specification shall conform to the requirements of Specification A957, includingany supplementary requirements that are indicated in the purc
12、hase order. Failure to comply with the general requirements ofSpecification A957 constitutes nonconformance with this specification. In case of conflict between the requirements of thisspecification and Specification A957, Specification A957 shall prevail.1 This specification is under the jurisdicti
13、on ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved Nov. 1, 2012May 1, 2013. Published December 2012May 2013. Originally approved in 1977. Last previous edition approved in 20102012 asA743/A74
14、3M 06 (2010).A743/A743M 12. DOI: 10.1520/A0743_A0743M-12.10.1520/A0743_A0743M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page
15、on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that use
16、rs consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Consho
17、hocken, PA 19428-2959. United States14. Ordering Information4.1 Orders for material to this specification should include the following, as required, to describe the material adequately:4.1.1 Description of the casting by pattern number or drawing,4.1.2 Grade,4.1.3 Heat treatment,4.1.4 Options in the
18、 specification,4.1.5 Whether castings are to be produced using the investment casting process, and4.1.6 Supplementary requirements desired, including the standards of acceptance.5. Process5.1 The steel shall be made by the electric furnace process with or without separate refining such as argon-oxyg
19、endecarburization (AOD).6. Heat Treatment6.1 Castings shall be heat treated in accordance with the requirements in Table 1.NOTE 2Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties.Minimum heat treat temperatures
20、are specified; however, it is sometimes necessary to heat treat at higher temperatures, hold for some minimum time attemperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.7. Chemical Requirements7.1 The chemical requirements are sh
21、own in Table 2.TABLE 2 Chemical RequirementsGrade(UNS) TypeComposition, %Carbon,maxMan-ganese,maxSilicon,maxPhospho-rus, maxSulfur,max Chromium NickelMolybde-numColum-biumSele-nium CopperTung-sten,maxVana-dium,maxNitrogenCA6N 11 Chromium, 0.06 0.50 1.00 0.02 0.02 10.512.5 6.0 . . . . . . .TABLE 1 He
22、at Treatment RequirementsGrade Heat TreatmentCA6N Heat to 1900F 1040C, air cool, reheat to 1500F 815C, air cool, and age at 800F 425C, holding at eachtemperature sufficient time to heat casting uniformly to temperature.CA6NM Heat to 1850F 1010C minimum, air cool to 200F 95C or lower prior to any opt
23、ional intermediate temper andprior to the final temper. The final temper shall be between 1050F 565C and 1150F 620C.CA15, CA15M, CA40, CA40F (1) Heat to 1750F 955C minimum, air cool and temper at 1100F 595C minimum, or(2) Anneal at 1450F 790C minimum.CA28MWV (1) Heat to 18751925F 10251050C, quench i
24、n air or oil, and temper at 1150F 620C minimum, or(2) Anneal at 1400F 760C minimum.CB30, CC50 (1) Heat to 1450F 790C minimum, and air cool, or(2) Heat to 1450F 790C minimum, and furnace cool.CB6 Heat between 1800F 980C and 1920F 1050C, forced air, cool to 120F 50C maximum, and temperbetween 1100F an
25、d 1160F 595C and 625C.CE30, CH10, CH20, CK20 Heat to 2000F 1093C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CF3, CF3M, CF3MN (1) Heat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, and cool rapidly.(
26、2) As cast if corrosion resistance is acceptable.CF3, CF3M, CF3MN (1) Heat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, quench in water orrapid cool by other means.(2) As cast if corrosion resistance is acceptable.CF8, CF8C, CF8M, CF16F, CF16Fa,CF20, CG3M, CG8M, C
27、G12Heat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CF10SMnN Heat to 1950F 1065C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CG6MMN, CN7M Heat to 2050F 1
28、120C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CK3MCuN Heat to 2100F 1150C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CK35MN Heat to 2100-2190F 1150-1200C, hold for
29、sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CN3M Heat to 2150F 1175C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CN3MN Heat to 2100F 1150C minimum, hold for sufficient time to heat casti
30、ng to temperature, quench in water or rapidcool by other means.CN7MS Heat to 2100F 1150C minimum, 2150F 1180C maximum, hold for sufficient time (2 h minimum) to heatcasting to temperature and quench in water.HG10MNN As-castA743/A743M 132TABLE 2 ContinuedGrade(UNS) TypeComposition, %Carbon,maxMan-gan
31、ese,maxSilicon,maxPhospho-rus, maxSulfur,max Chromium NickelMolybde-numColum-biumSele-nium CopperTung-sten,maxVana-dium,maxNitrogen7 Nickel 8.0CA6NM(J91540)12 Chromium,4 Nickel0.06 1.00 1.00 0.04 0.03 11.514.0 3.54.50.401.0 . . . . . .CA15(J91150)12 Chromium 0.15 1.00 1.50 0.04 0.04 11.514.0 1.00max
32、0.50 max . . . . . .CA15M(J91151)12 Chromium 0.15 1.00 0.65 0.040 0.040 11.514.0 1.0max0.151.0 . . . . . .CA28MWV(J91422)12 Chromium, withMolybdenum,Tungsten andVanadium0.200.280.501.001.0 0.030 0.030 11.012.5 0.501.000.901.25 . . . 0.901.250.200.30.CA40(J91153)12 Chromium 0.200.401.00 1.50 0.04 0.0
33、4 11.514.0 1.0max0.5 max . . . . . .CA40F(J91154)12 Chromium,Free Machining0.200.401.00 1.50 0.04 0.200.4011.514.0 1.0max0.5 max . . . . . .CB6(J91804)16 Chromium,4 Nickel0.06 1.00 1.00 0.04 0.03 15.517.5 3.55.5 0.5 max . . . . . . . . . . . . . . . . . .CB30(J91803)20 Chromium 0.30 1.00 1.50 0.04 0
34、.04 18.021.0 2.00max. . . B . . .CC50(J92615)28 Chromium 0.50 1.00 1.50 0.04 0.04 26.030.0 4.00max. . . . . . .CE30(J93423)29 Chromium,9 Nickel0.30 1.50 2.00 0.04 0.04 26.030.0 8.011.0. . . . . . .CF3(J92500)19 Chromium,9 Nickel0.03 1.50 2.00 0.04 0.04 17.021.0 8.012.0. . . . . . .CF3M(J92800)19 Chr
35、omium,10 Nickel, withMolybdenum0.03 1.50 1.50 0.04 0.04 17.021.0 9.013.02.03.0 . . . . . .CF3MN(J92804)19 Chromium,10 Nickel, withMolybdenum, andNitrogen0.03 1.50 1.50 0.040 0.040 17.022.0 9.013.02.03.0 . . . . . 0.100.20CF8(J92600)19 Chromium,9 Nickel0.08 1.50 2.00 0.04 0.04 18.021.0 8.011.0. . . .
36、 . . .CF8C(J92710)19 Chromium,10 Nickel, withColumbium0.08 1.50 2.00 0.04 0.04 18.021.0 9.012.0. A . . . . .CF8M(J92900)19 Chromium,10 Nickel, withMolybdenum0.08 1.50 2.00 0.04 0.04 18.021.0 9.012.02.03.0 . . . . . .CF10SMnN(J92972)17 Chromium, 8.5Nickel withNitrogen0.10 7.009.003.504.500.060 0.030
37、16.018.0 8.09.0. . . . . . 0.080.18CF16F(J92701)19 Chromium,9 Nickel, FreeMachining0.16 1.50 2.00 0.17 0.04 18.021.0 9.012.01.50 max . 0.200.35. . . .CF16Fa 19 Chromium,9 Nickel, FreeMachining0.16 1.50 2.00 0.04 0.200.4018.021.0 9.012.00.400.80 . . . . . .CF20(J92602)19 Chromium,9 Nickel0.20 1.50 2.
38、00 0.04 0.04 18.021.0 8.011.0. . . . . . .CG3M(J92999)19 Chromium,11 Nickel, withMolybdenum0.03 1.50 1.50 0.04 0.04 18.021.0 9.013.03.04.0 . . . . . . . . . . . . . . . . . .CG6MMN(J93790)0.06 4.006.001.00 0.04 0.03 20.523.5 11.513.51.503.00 0.100.30. . . 0.100.300.200.40CG8M(J93000)19 Chromium,11 N
39、ickel, withMolybdenum0.08 1.50 1.50 0.04 0.04 18.021.0 9.013.03.04.0 . . . . . .CG12(J93001)22 Chromium,12 Nickel0.12 1.50 2.00 0.04 0.04 20.023.0 10.013.0. . . . . . .CH10(J93401)25 Chromium,12 Nickel0.10 1.50 2.00 0.04 0.04 22.026.0 12.015.0. . . . . . . . .CH20(J93402)25 Chromium,12 Nickel0.20 1.
40、50 2.00 0.04 0.04 22.026.0 12.015.0. . . . . . .CK35MN 23 Chromium, 21Nickel, withMolybdenum andNitrogen0.035 2.00 1.00 0.035 0.020 22.0-24.0 20.0-22.06.0-6.8 . . . . . . 0.40 . . . . . . 0.21-0.32A743/A743M 133TABLE 2 ContinuedGrade(UNS) TypeComposition, %Carbon,maxMan-ganese,maxSilicon,maxPhospho-
41、rus, maxSulfur,max Chromium NickelMolybde-numColum-biumSele-nium CopperTung-sten,maxVana-dium,maxNitrogenCK3MCuN(J93254)20 Chromium18 Nickel, withCopper andMolybdenum0.025 1.20 1.00 0.045 0.010 19.520.5 17.519.56.07.0 . . . . . . 0.501.00. . . . . . 0.1800.240CK20(J94202)25 Chromium,20 Nickel0.20 2.
42、00 2.00 0.04 0.04 23.027.0 19.022.0. . . . . . .CN3M(J94652)0.03 2.0 1.0 0.03 0.03 20.022.0 23.027.04.55.5 . . . . . .CN3MN(J94651)21 Chromium,24 Nickel withMolybdenumand Nitrogen0.03 2.00 1.00 0.040 0.010 20.022.0 23.525.56.07.0 . . 0.75max. . 0.180.26CN7M(N08007)20 Chromium,29 Nickel, withCopper a
43、ndMolybdenum0.07 1.50 1.50 0.04 0.04 19.022.0 27.530.52.03.0 . . 3.04.0. . .CN7MS(J94650)19 Chromium,24 Nickel, withCopper andMolybdenum0.07 1.00 2.503.500.04 0.03 18.020.0 22.025.02.53.0 . . 1.52.0.HG10MNNJ9260419 Chromium,12 Nickel,4 Manganese0.070.113.05.00.70 0.040 0.030 18.5 20.511.513.50.250.4
44、5C . 0.50 . . 0.200.30A Grade CF8C shall have a columbium content of not less than eight times the carbon content and not more than 1.0%. If a columbium-plus-tantalum alloy in theapproximate Cb:Ta ratio of 3:1 is used for stabilizing this grade, the total columbium-plus-tantalum content shall not be
45、 less than nine times the carbon content and shallnot exceed 1.1%.B For Grade CB30 a copper content of 0.90 to 1.20% is optional.C Grade HG10MNN shall have a columbium content of not less than eight times the carbon, but not over 1.00 %.8. Repair by Welding8.1 Repair welding of Grade CA28MWV is not
46、permitted unless by agreement between the manufacturer and the purchaser.8.2 When methods involving high temperature are used in the removal of discontinuities, castings shall be preheated inaccordance with Table 3. Weld repairs shall be subject to the same quality standards as are used to inspect t
47、he castings.8.3 Post weld heat treatment, if required, shall be in accordance with Table 1.8.3.1 The martensitic grades CA6NM, CA15, CA15M, CB6, and CA40 shall be retempered after weld repairing, except thatlocal tempering will be permitted if, in the opinion of the manufacturer, furnace heat treati
48、ng will be damaging to the finishedsurface of a machined casting. Heat treatment, other than tempering, of grades CA6NM, CA15, CA15M, CB6, and CA40 afterweld repairing shall be performed only when agreed upon between the manufacturer and the purchaser. Weld repair on GradeCA40F is not recommended be
49、cause of the risk of local hardening and possible cracking in the heat affected zone.8.3.2 Post weld heat treatment is not required on the other grades of this specification.When post weld heat treatment is believednecessary for adequate corrosion resistance in the service environment, castings should be ordered in accordance with SpecificationA744/
