1、Designation:A234/A234M17Used in USDOE-NE StandardsStandard Specification forPiping Fittings of Wrought Carbon Steel and Alloy Steel forModerate and High Temperature Service1This standard is issued under the fixed designation A234/A234M;the number immediately following the designation indicates the y
2、earof original adoption 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 U.S.Departm
3、ent of Defense.1.Scope*1.1 This specification2covers wrought carbon steel andalloy steel fittings of seamless and welded construction coveredby the latest revision of ASME B16.9,B16.11,MSS-SP-79,MSS-SP-83,MSS-SP-95,and MSS-SP-97.These fittings arefor use in pressure piping and in pressure vessel fab
4、rication forservice at moderate and elevated temperatures.Fittings differ-ing from these ASME and MSS standards shall be furnished inaccordance with Supplementary Requirement S58 of Specifi-cation A960/A960M.1.2 Optional supplementary requirements are provided forfittings where a greater degree of e
5、xamination is desired.Whendesired,one or more of these supplementary requirements maybe specified in the order.1.3 This specification does not cover cast welding fittings orfittings machined from castings.Cast steel welding fittings aregoverned by Specifications A216/A216M and A217/A217M.1.4 This sp
6、ecification is expressed in both inch-pound unitsand in SI units.However,unless the order specifies theapplicable“M”specification designation(SI units),the mate-rial shall be furnished to inch-pound units.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as st
7、andard.Within the text,theSI units are shown in brackets.The values stated 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 This international standard was
8、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 to Trade(TBT)Committee.2.Referenced Doc
9、uments2.1 In addition to those reference documents listed inSpecification A960/A960M,the following list of standardsapply to this specification.2.2 ASTM Standards:3A105/A105M Specification for Carbon Steel Forgings forPiping ApplicationsA216/A216M Specification for Steel Castings,Carbon,Suit-able fo
10、r Fusion Welding,for High-Temperature ServiceA217/A217M Specification for Steel Castings,MartensiticStainless and Alloy,for Pressure-Containing Parts,Suit-able for High-Temperature ServiceA960/A960M Specification for Common Requirements forWrought Steel Piping Fittings2.3 ASME Standards:4B16.9 Steel
11、 Butt-Welding FittingsB16.11 Forged Steel Fittings,Socket Welding and Threaded2.4 ASME Boiler and Pressure Vessel Code:4Section VSection VIII,Division 1Section IX2.5 MSS Standards:5MSS-SP-25 Standard Marking System for Valves,Fittings,Flanges,and UnionsMSS-SP-79 Socket Welding Reducer InsertsMSS-SP-
12、83Steel Pipe Unions,Socket-Welding andThreaded1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.22 on Steel Forgings and Wrought Fittings for Piping Applications and BoltingMaterials for
13、 Piping and Special Purpose Applications.Current edition approved May 15,2017.Published June 2017.Originallyapproved in 1940.Last previous edition approved in 2016 as A234/A234M 16.DOI:10.1520/A0234_A0234M-17.2For ASME Boiler and Pressure Vessel Code applications see related Specifi-cation SA-234 in
14、 Section II of that Code.3For 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.4Available from American Society of Mecha
15、nical Engineers(ASME),ASMEInternational Headquarters,Two Park Ave.,New York,NY 10016-5990,http:/www.asme.org.5Available 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 e
16、nd 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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 MSS-SP-95 Swage(d)Nipples and Bull PlugsMSS-SP-97 Integra
