1、Designation:A988/A988M17Standard Specification forHot Isostatically-Pressed Stainless Steel Flanges,Fittings,Valves,and Parts for High Temperature Service1This standard is issued under the fixed designation A988/A988M;the number immediately following the designation indicates the yearof original ado
2、ption 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.1.Scope*1.1 This specification covers hot isostatically-pressed,pow-der metallurgy,stain
3、less steel piping components for use inpressure systems.Included are flanges,fittings,valves,andsimilar parts made to specified dimensions or to dimensionalstandards,such as in ASME specification B16.5.1.2 Several grades of martensitic,austenitic,age hardening,and austenitic-ferritic stainless steel
4、s are included in thisspecification.1.3 Supplementary requirements are provided for use whenadditional testing or inspection is desired.These shall applyonly when specified individually by the purchaser in the order.1.4 This specification is expressed in both inch-pound unitsand in SI units.Unless t
5、he order specifies the applicable“M”specification designation(SI units),however,the material shallbe furnished to inch-pound units.1.5 The values stated in either inch-pound units or SI unitsare to be regarded separately as the standard.Within the text,the SI units are shown in brackets.The values s
6、tated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in non-conformance with thestandard.1.6 The following safety hazards caveat pertains only to testmethods portions 8.1,8.2,9.5 9.7,and Section
7、 10 of thisspecification:This standard does not purport to address all ofthe safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to u
8、se.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 Organization TechnicalBarriers
9、to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA745/A745M Practice for Ultrasonic Examination of Aus-tenitic Steel
10、ForgingsA751 Test Methods,Practices,and Terminology for Chemi-cal Analysis of Steel ProductsA923 Test Methods for Detecting Detrimental IntermetallicPhase in Duplex Austenitic/Ferritic Stainless SteelsA961/A961M Specification for Common Requirements forSteel Flanges,Forged Fittings,Valves,and Parts
11、forPiping ApplicationsB311 Test Method for Density of Powder Metallurgy(PM)Materials Containing Less Than Two Percent PorosityE112 Test Methods for Determining Average Grain SizeE165/E165M Practice for Liquid Penetrant Examination forGeneral IndustryE340 Practice for Macroetching Metals and AlloysE6
12、06/E606M Test Method for Strain-Controlled FatigueTestingG48 Test Methods for Pitting and Crevice Corrosion Resis-tance of Stainless Steels and Related Alloys by Use ofFerric Chloride Solution2.2 MSS Standard:SP 25 Standard Marking System for Valves,Fittings,Flanges,and Unions31This specification is
13、 under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 onSteel Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for Piping and Special Purpose Applications.Current edition approved May
14、 1,2017.Published May 2017.Originallyapproved in 1998.Last previous edition approved in 2016 as A988/A988M 16.DOI:10.1520/A0988_A0988M-17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume info
15、rmation,refer to the standards Document Summary page onthe ASTM website.3Available 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 Int
16、ernational,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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 2.3 ASME Specifications and Boiler and Pressure VesselCodes:B16.5 Dimensional Standards for St