1、Designation:A747/A747M18Standard Specification forSteel Castings,Stainless,Precipitation Hardening1This standard is issued under the fixed designation A747/A747M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revisi
2、on.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers iron-chromium-nickel-coppercorrosion-resistant steel castings,capable of being strength-ened by precipitat
3、ion hardening heat treatment.1.2 These castings may be used in services requiring corro-sion resistance and high strengths at temperatures up to 600 F315 C.They may be machined in the solution heat-treatedcondition and subsequently precipitation hardened to the de-sired high-strength mechanical prop
4、erties specified in TableS24.1 with little danger of cracking or distortion.1.3 The material is not intended for use in the solutionheat-treated condition.NOTE1If the service environment in which the material is to be usedis considered conducive to stress-corrosion cracking,precipitation hard-ening
5、should be performed at a temperature that will minimize thesusceptibility of the material to this type of attack.1.4 Supplementary 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 th
6、e purchaser in the purchase order or contract.1.5 This specification is expressed in both inch-pound unitsand in SI units;however,unless the purchase order or contractspecifies the applicable M-specification designation(SI units),the inch-pound units shall apply.1.6 The values stated in either SI un
7、its or inch-pound unitsare to be regarded separately 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 nonconformancewith the standard.1.6.1 Within the text,the SI
8、units are shown in brackets.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organi
9、zation TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A781/A781M Specification for Castings,Steel and Alloy,Common Requirements,for General Industrial UseA957/A957M Specification for Investment Castings,Steeland Alloy,Common Requirements,for General IndustrialUseA
10、1067/A1067M Specification for Test Coupons for SteelCastingsA1080 Practice for Hot Isostatic Pressing of Steel,StainlessSteel,and Related Alloy Castings2.2 ASME Standard:3ASME Boiler and Pressure Vessel Code,SupplementaryRequirements Section II,Part A3.General Conditions for Delivery3.1 Except for i
11、nvestment castings,castings furnished tothis specification shall be in accordance with the requirementsof Specification A781/A781M,including any supplementaryrequirements that are indicated in the purchase order.Failure tocomply with the general requirements of Specification A781/A781M constitutes n
12、onconformance with this specification.Incase of conflict between the requirements of this specificationand Specification A781/A781M,this specification shall pre-vail.3.2 Steel investment castings furnished to this specificationshall conform to the requirements of Specification A957/A957M,including a
13、ny supplementary requirements that areindicated in the purchase order.Failure to comply with thegeneral requirements of Specification A957/A957M consti-tutes nonconformance with this specification.In case of con-flict between the requirements of this specification and Speci-fication A957/A957M,Speci
14、fication A957/A957M shallprevail.1This 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 Nov.1,2018.Published November 2018.Originallyapproved in 1977.L
15、ast previous edition approved in 2016 as A747/A747M 16a.DOI:10.1520/A0747_A0747M-18.2For 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 o
16、nthe ASTM website.3Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principl