1、Designation: A 743/A 743M 06Standard Specification forCastings, Iron-Chromium, Iron-Chromium-Nickel, CorrosionResistant, for General Application1This standard is issued under the fixed designation A 743/A 743M; the number immediately following the designation indicates the yearof original adoption o
2、r, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope
3、*1.1 This specification covers iron-chromium and iron-chromium-nickel alloy castings for general corrosion-resistantapplication. The grades covered by this specification representtypes of alloy castings suitable for broad ranges of applicationwhich are intended for a wide variety of corrosion enviro
4、n-ments.NOTE 1For alloy castings for severe corrosion-resistant service,reference should be made to Specification A 744/A 744M. For generalheat-resistant alloy castings, reference should be made to SpecificationA 297/A 297M. For nickel alloy castings for corrosion-resistant service,reference should
5、be made to Specification A 494/A 494M.1.2 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
6、 of the other. Combining values from thetwo systems may result in nonconformance with the specifi-cation. Inch-pound units are applicable for material ordered toSpecification A 743 and SI units for material ordered toSpecification A 743M.2. Referenced Documents2.1 ASTM Standards:2A 262 Practices for
7、 Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless SteelsA 297/A 297M Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Resistant, forGeneral ApplicationA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 494/A 494M Specifi
8、cation for Castings, Nickel andNickel AlloyA 744/A 744M Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe ServiceA 781/A 781M Specification for Castings, Steel and Alloy,Common Requirements, for General Industrial UseA 890/A 890M Specification for Castings, Iron-Chrom
9、ium-Nickel-Molybdenum Corrosion-Resistant, Duplex(Austenitic/Ferritic) for General ApplicationA 957 Specification for Investment Castings, Steel andAlloy, Common Requirements, for General Industrial Use3. General Conditions for Delivery3.1 Except for investment castings, castings furnished tothis sp
10、ecification shall conform to the requirements of Speci-fication A 781/A 781M, including any supplementary require-ments that are indicated on the purchase order. Failure tocomply with the general requirements of Specification A 781/A 781M constitutes nonconformance with this specification. Incase of
11、 conflict between the requirements of this specificationand Specification A 781/A 781M, this specification shall pre-vail.3.2 Steel investment castings furnished to this specificationshall conform to the requirements of Specification A 957,including any supplementary requirements that are indicated
12、inthe purchase order. Failure to comply with the general require-ments of Specification A 957 constitutes nonconformance withthis specification. In case of conflict between the requirementsof this specification and Specification A 957, Specification A957 shall prevail.4. Ordering Information4.1 Orde
13、rs for material to this specification should includethe following, as required, to describe the material adequately:4.1.1 Description of the casting by pattern number ordrawing,4.1.2 Grade,4.1.3 Heat treatment,4.1.4 Options in the specification,4.1.5 Whether castings are to be produced using the inv
14、est-ment casting process, and1This 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 March 1, 2006. Published March 2006. Originallyapproved in 1977. L
15、ast previous edition approved in 2003 as A 743/A 743M 03.2For 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 to the standards Document Summary page onthe ASTM website.1*A
16、Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.6 Supplementary requirements desired, including thestandards of acceptance.5. Process5.1 The steel shall be made by the
17、 electric furnace processwith or without separate refining such as argon-oxygen decar-burization (AOD).6. Heat Treatment6.1 Castings shall be heat treated in accordance with therequirements in Table 1.NOTE 2Proper heat treatment of these alloys is usually necessary toenhance corrosion resistance and
18、 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 enhance the corrosion resistance and meet mechani
19、cal properties.7. Chemical Requirements7.1 The chemical requirements are shown in Table 2TABLE 2 Chemical RequirementsGrade(UNS)TypeComposition, %Carbon,maxMan-ganese,maxSilicon,maxPhospho-rus, maxSulfur,maxChromium NickelMolybde-numColum-biumSele-niumCopperTung-sten,maxVana-dium,maxNitrogenCF8(J926
20、00)19 Chromium, 0.08 1.50 2.00 0.04 0.04 18.021.0 8.0 . . . . . . .9 Nickel 11.0CG12(J93001)22 Chromium, 0.12 1.50 2.00 0.04 0.04 20.023.0 10.0 . . . . . . .12 Nickel 13.0CF20(J92602)19 Chromium, 0.20 1.50 2.00 0.04 0.04 18.021.0 8.0 . . . . . . .9 Nickel 11.0CF8M(J92900)19 Chromium, 0.08 1.50 2.00
21、0.04 0.04 18.021.0 9.0 2.03.0 . . . . . .10 Nickel, withMolybdenum12.0CF8C(J92710)19 Chromium, 0.08 1.50 2.00 0.04 0.04 18.021.0 9.0 .A. . . . .TABLE 1 Heat Treatment RequirementsGrade Heat TreatmentCF8, CG3M, CG8M, CG12, CF20,CF8M, CF8C,CF16F, CF16FaHeat to 1900F 1040C minimum, hold for sufficient
22、time to heat casting to temperature, quench in water or rapidcool by other means.CH10, CH20, CE30, CK20 Heat to 2000F 1093C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CA15, CA15M, CA40, CA40F (1) Heat to 1750F 955C minimum, air cool
23、and temper at 1100F 595C minimum, or(2) Anneal at 1450F 790C minimum.CB30, CC50 (1) Heat to 1450F 790C minimum, and air cool, or(2) Heat to 1450F 790C minimum, and furnace cool.CF3, CF3M, CF3MN (1) Heat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, and cool rapidly
24、. (2)As cast if corrosion resistance is acceptable.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 casting to temperature, quench in water or rap
25、idcool by other means.CN7M, CG6MMN Heat to 2050F 1120C minimum, hold for sufficient time to heat casting 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
26、 in water.CA6NM Heat to 1850F 1010C minimum, air cool to 200F 95C or lower prior to any optional intermediate temper andprior to the final temper. The final temper shall be between 1050F 565C and 1150F 620C.CA6N Heat to 1900F 1040C, air cool, reheat to 1500F 815C, air cool, and age at 800F 425C, hol
27、ding at eachtemperature sufficient time to heat casting uniformly to temperature.CF10SMnN Heat to 1950F 1065C minimum, hold for sufficient time to heat casting to temperature, quench in water or rapidcool by other means.CA28MWV (1) Heat to 18751925F 10251050C, quench in air or oil, and temper at 115
28、0F 620C minimum, or(2) Anneal at 1400F 760C minimum.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 sufficient time to heat casting to temperature, quench in water
29、 or rapidcool by other means.CB6 Heat between 1800F 980C and 1920F 1050C, forced air, cool to 120F 50C maximum, and temperbetween 1100F and 1160F 595C and 625C.A 743/A 743M 062TABLE 2 ContinuedGrade(UNS)TypeComposition, %Carbon,maxMan-ganese,maxSilicon,maxPhospho-rus, maxSulfur,maxChromium NickelMol
30、ybde-numColum-biumSele-niumCopperTung-sten,maxVana-dium,maxNitrogen10 Nickel, withColumbium12.0CF16F(J92701)19 Chromium, 0.16 1.50 2.00 0.17 0.04 18.021.0 9.0 1.50 max . 0.20 . . . .9 Nickel, FreeMachining12.0 0.35CF16Fa 19 Chromium, 0.16 1.50 2.00 0.04 0.20 18.021.0 9.0 0.400.80 . . . . . .9 Nickel
31、, FreeMachining0.40 12.0CH10(J93401)25 Chromium, 0.10 1.50 2.00 0.04 0.04 22.026.0 12.0 . . . . . . . . .12 Nickel 15.0CH20(J93402)25 Chromium, 0.20 1.50 2.00 0.04 0.04 22.026.0 12.0 . . . . . . .12 Nickel 15.0CK20(J94202)25 Chromium, 0.20 2.00 2.00 0.04 0.04 23.027.0 19.0 . . . . . . .20 Nickel 22.
32、0CE30(J93423)29 Chromium, 0.30 1.50 2.00 0.04 0.04 26.030.0 8.0 . . . . . . .9 Nickel 11.0CA15(J91150)12 Chromium 0.15 1.00 1.50 0.04 0.04 11.514.0 1.00 0.50 max . . . . . .maxCA15M(J91151)12 Chromium 0.15 1.00 0.65 0.040 0.040 11.514.0 1.0 0.151.0 . . . . . .maxCB30(J91803)20 Chromium 0.30 1.00 1.5
33、0 0.04 0.04 18.021.0 2.00 . . .B. . .maxCC50(J92615)28 Chromium 0.50 1.00 1.50 0.04 0.04 26.030.0 4.00 . . . . . . .maxCA40(J91153)12 Chromium 0.20 1.00 1.50 0.04 0.04 11.514.0 1.0 0.5 max . . . . . .0.40 maxCA40F(J91154)12 Chromium, 0.20 1.00 1.50 0.04 0.20 11.514.0 1.0 0.5 max . . . . . .Free Mach
34、ining 0.40 0.40 maxCF3(J92500)19 Chromium, 0.03 1.50 2.00 0.04 0.04 17.021.0 8.0 . . . . . . .9 Nickel 12.0CF10SMnN(J92972)17 Chromium, 8.5Nickel withNitrogen0.10 7.009.003.504.500.060 0.030 16.018.0 8.09.0. . . . . . 0.080.18CF3M(J92800)19 Chromium, 0.03 1.50 1.50 0.04 0.04 17.021.0 9.0 2.03.0 . .
35、. . . .10 Nickel, withMolybdenum13.0CF3MN(J92804)19 Chromium,10 Nickel, withMolybdenum, andNitrogen0.03 1.50 1.50 0.040 0.040 17.022.0 9.013.02.03.0 . . . . . 0.100.20CG6MMN(J93790)0.06 4.006.001.00 0.04 0.03 20.523.5 11.513.51.503.00 0.100.30. . . 0.100.300.200.40CG3M(J92999)19 Chromium,11 Nickel,
36、withMolybdenum0.03 1.50 1.50 0.04 0.04 18.021.0 9.013.03.04.0 . . . . . . . . . . . . . . . . . .CG8M(J93000)19 Chromium, 0.08 1.50 1.50 0.04 0.04 18.021.0 9.0 3.04.0 . . . . . .11 Nickel, withMolybdenum13.0CN3M(J94652)0.03 2.0 1.0 0.03 0.03 20.022.0 23.027.04.55.5 . . . . . .CN3MN(J94651)21 Chromiu
37、m,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, 0.07 1.50 1.50 0.04 0.04 19.022.0 27.5 2.03.0 . . 3.0 . . .A 743/A 743M 063TABLE 2 ContinuedGrade(UNS)TypeComposition, %Carbon,maxMan-ganese,maxSilicon,maxPhospho-
38、rus, maxSulfur,maxChromium NickelMolybde-numColum-biumSele-niumCopperTung-sten,maxVana-dium,maxNitrogen29 Nickel, withCopper andMolybdenum30.5 4.0CN7MS(J94650)19 Chromium, 0.07 1.00 2.50 0.04 0.03 18.020.0 22.0 2.53.0 . . 1.5 .24 Nickel, withCopper andMolybdenum3.50 25.0 2.0CA6NM(J91540)12 Chromium,
39、 0.06 1.00 1.00 0.04 0.03 11.514.0 3.5 0.401.0 . . . . . .4 Nickel 4.5CA6N 11 Chromium, 0.06 0.50 1.00 0.02 0.02 10.512.5 6.0 . . . . . . .7 Nickel 8.0CA28MWV(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.CK3MC
40、uN(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. . . . . . 0.1800.240CK35MN 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 . . . . . . 0.21-0.32C
41、B6(J91804)16 Chromium,4 Nickel0.06 1.00 1.00 0.04 0.03 15.517.5 3.55.5 0.5 max . . . . . . . . . . . . . . . . . .AGrade 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
42、 is used for stabilizing this grade, the total columbium-plus-tantalum content shall not be less than nine times the carbon content and shallnot exceed 1.1%.BFor Grade CB30 a copper content of 0.90 to 1.20% is optional8. Repair by Welding8.1 Repair welding of Grade CA28MWV is not permittedunless by
43、agreement between the manufacturer and the pur-chaser.8.2 When methods involving high temperature are used inthe removal of discontinuities, castings shall be preheated inaccordance with Table 3. Weld repairs shall be subject to thesame quality standards as are used to inspect the castings.8.3 Post
44、weld heat treatment, if required, shall be in accor-dance with Table 1.8.3.1 The martensitic grades CA6NM, CA15, CA15M,CB6, and CA40 shall be retempered after weld repairing,except that local tempering will be permitted if, in the opinionof the manufacturer, furnace heat treating will be damaging to
45、the finished surface of a machined casting. Heat treatment,other than tempering, of grades CA6NM, CA15, CA15M,CB6, and CA40 after weld repairing shall be performed onlywhen agreed upon between the manufacturer and the pur-chaser. Weld repair on Grade CA40F is not recommendedbecause of the risk of lo
46、cal hardening and possible cracking inthe heat affected zone.8.3.2 Post weld heat treatment is not required on the othergrades of this specification. When post weld heat treatment isbelieved necessary for adequate corrosion resistance in theservice environment, castings should be ordered in accordan
47、cewith Specification A 744/A 744M.9. Product Marking9.1 Castings shall be marked for material identification withthe ASTM specification number (A 743/A 743M) and gradesymbol, that is, CF8, CA15, CB30, etc. In addition, themanufacturers name or identification mark and the patternnumber shall be cast
48、or stamped using the low-stress stamps onall castings. Small-size castings may be such that marking mustbe limited consistent with the available area. The marking ofheat numbers on individual castings shall be agreed uponbetween the manufacturer and the purchaser. Marking shall bein such position as
49、 not to injure the usefulness of the casting.10. Keywords10.1 corrosion resistant; iron-chromium; iron-chromium-nickel; steel castingsTABLE 3 Minimum Preheat TemperaturesGrade Minimum Preheat TemperaturesF CCA15, CA15M 400 205CA40, CA28MWVOthers 50 10A 743/A 743M 064SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall not apply unless
