1、Designation: A744/A744M 101A744/A744M 13Standard Specification forCastings, Iron-Chromium-Nickel, Corrosion Resistant, forSevere Service1This standard is issued under the fixed designation A744/A744M; the number immediately following the designation indicates the yearof original adoption or, in the
2、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.1 NOTES22.4 was cor
3、rected editorially in November 2011.1. Scope*1.1 This specification covers iron-chromium-nickel alloy, stainless steel castings intended for particularly severe corrosiveapplications.1.2 This specification requires postweld heat-treatment of all weld repairs affecting surfaces intended to be wetted
4、by thecorrosive medium. For applications for which postweld heat-treatment is not considered mandatory for retention of acceptablecorrosion resistance, refer to Specification A743/A743M.NOTE 1For general corrosion-resistant alloy castings, reference should be made to Specification A743/A743M. For ge
5、neral heat-resistant alloycastings, reference should be made to Specification A297/A297M. For nickel-base alloy castings, refer to Specification A494/A494M.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not
6、be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.3.1 Within the text, the SI units are shown in brackets.1.3.2 Inch-pound units are applicable for material ordered to Specific
7、ation A744 and SI units for material ordered toSpecification A744M.2. Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless SteelsA297/A297M Specification for Steel Castings, Iron-Chromium and Iron-Chromium-Nickel, Heat Re
8、sistant, for GeneralApplicationA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA494/A494M Specification for Castings, Nickel and Nickel AlloyA732/A732M Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloyfor High Stren
9、gth at Elevated TemperaturesA743/A743M Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for GeneralApplicationA781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial UseA957 Specification for Investment Castings, Steel
10、and Alloy, Common Requirements, for General Industrial UseE29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications2.2 American Welding Society Standards:3AWS A5.11 Specification for Nickel and Nickel Alloy Covered Welding ElectrodesAWS A5.14 Specification f
11、or Nickel and Nickel Alloy Bare Welding Rods and Electrodes1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.18on Castings.Current edition approved May 1, 2010May 15, 2013. Published Ju
12、ne 2010June 2013. Originally approved in 1977. Last previous edition approved in 20062011 asA744/A744M 06.A744/A744M 101. DOI: 10.1520/A0744_A0744M-10.10.1520/A0744_A0744M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For
13、Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from The American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126.This document is not an ASTM standard and is intended only to provide the user of an ASTM standar
14、d 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 users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM i
15、s 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 Conshohocken, PA 19428-2959. United States13. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 wetted su
16、rface, none that contacts a corrosive environment.4. General Conditions for Delivery4.1 Except for investment castings, castings furnished to this specification shall conform to the requirements of SpecificationA781/A781M, including any supplementary requirements that are indicated on the purchase o
17、rder. Failure to comply with thegeneral requirements of Specification A781/A781M constitutes nonconformance with this specification. In case of conflict betweenthe requirements of this specification and Specification A781/A781M, this specification shall prevail.4.2 Steel investment castings furnishe
18、d to this specification shall conform to the requirements of Specification A957, includingany supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements ofSpecification A957 constitutes nonconformance with this specification. In case of confl
19、ict between the requirements of thisspecification and Specification A957, Specification A957 shall prevail.5. Ordering Information5.1 Orders for material to this specification should include the following, as required, to describe the material adequately:5.1.1 Description of the casting by pattern n
20、umber or drawing (dimensional tolerances shall be included on the casting drawing),5.1.2 Grade,5.1.3 Heat treatment,5.1.4 Identify wetted surface(s),5.1.5 Options in the specification,5.1.6 Whether casting are to be produced using the investment casting process, and5.1.7 Supplementary requirements d
21、esired, including the standards of acceptance.6. Process6.1 Alloys shall be melted by the electric furnace process with or without separate refining, such as argon-oxygen-decarburization (AOD).7. Heat Treatment7.1 Castings shall be heat treated in accordance with the requirements in Table 1.NOTE 2Pr
22、oper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties.Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat treat at higher temperatures, hold for some minimum time attemperature an
23、d then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.8. Chemical Requirements8.1 The materials shall conform with the chemical requirements prescribed in Table 2.TABLE 1 Heat Treatment RequirementsGrade Heat TreatmentCF8 (J92600), CG8M (J93000)
24、, CF8M (J92900),CF8C (J92710), CF3 (J92500), CF3M (J92800),CG3M (J92999)AHeat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, quench in wateror rapid cool by other means.CF8 (J92600), CG8M (J93000), CF8M (J92900),CF8C (J92710), CF3 (J92500), CF3M (J92800),CG3M (J9299
25、9)AHeat to 1900F 1040C minimum, hold for sufficient time to heat casting to temperature, quench in wateror rapid cool by other means.CN7M (N08007), CN3MCu (J80020) Heat to 2050F 1120C minimum, hold for sufficient time to heat casting to temperature, quench in wateror rapid cool by other means.CN7MS
26、(J94650) Heat to 2100F 1150C min, 2150F 1180C max, hold for sufficient time (2 h min) to heat casting totemperature, and quench in water.CN7MS (J94650) Heat to 2100F 1150C minimum, 2150F 1180C maximum, hold for sufficient time (2 h min) to heatcasting to temperature, and quench in water.CN3MN J94651
27、 Heat to 2100F 1150C minimum, hold for sufficient time to heat casting to temperature, quench in wateror cool rapidly by other means.CK3MCuN (J93254), CN3MN (J94651) Heat to 2200F 1200C minimum, hold for a minimum of 4 hours, quench in water or cool rapidly by othermeans.CK3MCuN (J93254) Heat to 210
28、0F 1150C minimum, hold for sufficient time to heat casting to temperature, quench in wateror rapid cool by other means.A For optimum tensile strength, ductility, and corrosion resistance, the solution annealing temperatures for Grades CF8M, CG8M, and CF3M should be in excess of 1900F1040C.A744/A744M
29、 132TABLE 2 Chemical RequirementsGrade TypeComposition, %Car-bon,maxManga-nese,maxSilicon,maxPhos-phorus,maxSul-fur,maxChromium Nickel Molyb-denumCo-lum-biumCopper Sele-niumTung-sten,maxVana-dium,maxIron,maxNitro-genCF8(J92600)19 Chromium,9 Nickel0.08 1.50 2.0 0.04 0.04 18.021.0 8.011.0 . . . . . .
30、. . .CF8M(J92900)19 Chromium,10 Nickel with Molybdenum0.08 1.50 2.0 0.04 0.04 18.021.0 9.012.0 2.03.0 . . . . . .CF8C(J92710)19 Chromium,10 Nickel, with Columbium0.08 1.50 2.0 0.04 0.04 18.021.0 9.012.0 . . . A . . .CF3(J92500)19 Chromium,9 Nickel0.03B 1.50 2.0 0.04 0.04 17.021.0 8.012.0 . . . . . .
31、 . .CF3M(J92800)19 Chromium,10 Nickel with Molybdenum0.03B 1.50 1.50 0.04 0.04 17.021.0 9.013.0 2.03.0 . . . . .CG3M(J92999)19 Chromium,11 Nickel, with Molybdenum0.03 1.50 1.50 0.04 0.04 18.021.0 9.013.0 3.04.0 . . . . . . . . . . . . . . . . . . . . .CG8M(J93000)19 Chromium,11 Nickel, with Molybden
32、um0.08 1.50 1.50 0.04 0.04 18.021.0 9.013.0 3.04.0 . . . . . .CN7M(N08007)20 Chromium,29 Nickel, with Copperand Molybdenum0.07 1.50 1.50 0.04 0.04 19.022.0 27.530.5 2.03.0 . . . 3.04.0CN7MS(J94650)19 Chromium,24 Nickel, with Copperand Molybdenum0.07 1.0 2.503.50 0.04 0.03 18.020.0 22.025.0 2.53.0 .
33、. . 1.52.0CN3MN(J94651)21 Chromium,24 Nickel with Molybdenumand Nitrogen0.03 2.00 1.00 0.040 0.010 20.022.0 23.525.5 6.007.00 . . . 0.75 max . . . . . . . . . . . . 0.180.26CK3MCuN(J93254)20 Chromium,18 Nickel with Molybdenumand Copper0.025 1.20 1.00 0.045 0.010 19.520.5 17.519.5 6.07.0 . . . 0.501.
34、00 . . . . . . . . . . . . 0.1800.240CN3MCu(J80020)20 Chromium, 29 Nickel, withCopper and Molybdenum0.03 1.50 1.0 0.030 0.015 19.0 22.0 27.5 30.5 2.0 3.0 . . . 3.0 3.5 . . .A Grade CF8C shall have a columbium content of not less than eight times the carbon content and not more than 1.0 %. If a colum
35、bium-plus-tantalum alloy in the approximate Cb:Ta ratio of 3:1 is used for stabilizingthis grade, the total columbium-plus-tantalum content shall not be less than nine times the carbon content and shall not exceed 1.1 %.B For purposes of determining conformance with this specification, the observed
36、or calculated value for carbon content shall be rounded to the nearest 0.01 % in accordance with the rounding method of Practice E29.A744/A744M1339. Workmanship, Finish, and Appearance9.1 Machined welding ends shall be suitably protected against damage during shipping.10. Repair by Welding10.1 The c
37、omposition of the deposited weld metal shall be similar to that of the casting except in grade CK3MCuN. In the caseof Grade CK3MCuN, the composition of the deposited metal shall be similar to that ofAWSA5.14 ER NiCrMo-3 (UNS NO6625)or AWS A5.11 E NiCrMo-3 (UNS W 86112) when postweld heat treatment i
38、s not required, and the composition of the depositedmetal shall be either similar to that of the base metal or similar to that of AWS A5.14 ER NiCrMo-3 or AWS A5.11 E NiCrMo-3when postweld heat treatment is required.10.1.1 The composition of the deposited weld metal shall be similar to that of the c
39、asting except in grade CN3MN. In the caseof grade CN3MN, the composition of the deposited weld metal shall be similar to that of AWS A5.14 ER NiCrMo-3 or ERNiCrMo-4 or ER NiCrMo-10, or the composition of the deposited weld metal shall be similar to that of AWS A5.11 E NiCrMo-3or E NiCrMo-4 or E NiCr
40、Mo-10 when postweld heat treatment is or is not required.10.2 Weld repairs shall be considered major in the case of a casting that has leaked on hydrostatic test or when the depth ofthe cavity after preparation for repair exceeds 20 % of the actual wall thickness, or 1 in. 25 mm, whichever is smalle
41、r, or whenthe extent of the cavity exceeds approximately 10 in.2 65 cm2.All other weld repairs shall be considered minor. Major and minorweld repairs shall be subject to the same quality standards as are used to inspect the castings. When methods involving hightemperatures are used in the removal of
42、 discontinuities, castings shall be preheated to 50F 10C min.10.3 Castings Except for grades CK3MCuN and CN3MN, castings shall be postweld heat treated in accordance with Table 1after all major weld repairs and after those minor weld repairs involving either of the following conditions: (1) welding
43、on a wettedsurface, or (2) welding that heats a wetted surface to or above 800F 425C.NOTE 3The maximum wetted surface temperature of 800F 425C permitted on minor weld repairs without subsequent heat treatment for theaustenitic grades is necessary to avoid sensitization to intergranular corrosion. Mi
44、nor repairs of this type can be made by using a low heat input (example,50 000 J/in.) welding process or by cooling wetted surfaces with water during welding, or both. Wetted surface temperature measurement can beaccomplished with temperature-indicating crayon or contact pyrometer.10.3.1 The post-we
45、ld treatment for grades CK3MCuN and CN3MN shall be as specified in Table 1 except that the minimumsoak time for castings that have already been heat treated according to Table 1 may be 1 hour.11. Rejection and Rehearing11.1 Samples that represent rejected material shall be preserved for two weeks fr
46、om the date of transmission of the rejectionreport. In case of dissatisfaction with the results of the tests, the manufacturer may make claim for a rehearing within that time.A744/A744M 13412. Product Marking12.1 Castings shall be marked for material identification with the ASTM specification number
47、 (A744/A744M) and gradesymbol, that is, CF8, CN7M, etc. In addition, the manufacturers name or identification mark and the pattern number shall be castor stamped using low-stress stamps on all castings. Small-size castings may be such that marking must be limited consistent withthe available area. T
48、he marking of heat numbers on individual castings shall be agreed upon by the manufacturer and the purchaser.Marking shall be in such position as not to injure the usefulness of the casting.13. Keywords13.1 austenitic stainless steel; corrosion; stainless steel; steel castingsSUPPLEMENTARY REQUIREME
49、NTSThe following supplementary requirements shall not apply unless specified in the purchase order.Alist of standard supplementary requirements for use at the option of the purchaser is included inSpecification A781/A781M. Those which are ordinarily considered for use with this specification aregiven below. Others enumerated in Specification A781/A781M may be used with this specificationupon agreement between the manufacturer and the purchaser.S2. Radiographic Exa
