1、Designation:A949/A949M01(Reapproved 2019)Standard Specification forSpray-Formed Seamless Ferritic/Austenitic Stainless SteelPipe1This standard is issued under the fixed designation A949/A949M;the number immediately following the designation indicates the yearof original adoption or,in the case of re
2、vision,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.Scope1.1 This specification covers spray-formed seamless ferritic/austenitic stainless steel pipe intended for g
3、eneral corrosiveservice,with particular emphasis on resistance to stress corro-sion cracking.These steels are susceptible to embrittlement ifused for prolonged periods at elevated temperatures.1.2 Optional supplementary requirements are provided forpipe where a greater degree of testing is desired.T
4、hesesupplementary requirements call for additional tests to be madeand when desired,one or more of these may be specified in theorder.1.3 Appendix X1 of this specification lists the dimensions ofseamless stainless steel pipe as shown in ANSI B 36.19.Pipehaving other dimensions may be furnished provi
5、ded such pipecomplies with all other requirements of this specification.1.4 The values stated in either SI units 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.Com
6、biningvalues from the two systems may result in non-conformancewith the standard.1.4.1 Within the text,the SI units are shown in brackets.1.4.2 The inch-pound units shall apply unless the“M”designation of this specification is specified in the order.NOTE1The dimensionless designator NPS(nominal pipe
7、 size)hasbeen substituted in this standard for such traditional terms as“nominaldiameter,”“size,”and“nominal size.”1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment
8、of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A450/A450M Specification for General Requirements forCarbon and Low Alloy Steel TubesA941 Terminology Relating to Steel,Sta
9、inless Steel,RelatedAlloys,and FerroalloysA999/A999M Specification for General Requirements forAlloy and Stainless Steel PipeE381 Method of Macroetch Testing Steel Bars,Billets,Blooms,and ForgingsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.2 ANSI/ASME Standards
10、:B 1.20.1 Pipe Threads,General Purpose3B 36.10M-1995 Welded and Seamless Wrought Steel Pipe3B 36.19 Stainless Steel Pipe2.3 Other Standard:SAE J1086 Practice for Numbering Metals and Alloys(UNS)43.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification,referto Terminolog
11、y A941.3.2 Definitions of Terms Specific to This Standard:3.2.1 spray-formeddenotes the fabrication of differentshapes of a metallic material by deposition of a spray,consisting of droplets,solid particles,and particles that arepartially solid,onto a moving substrate.3.2.1.1 DiscussionThe spray is p
12、roduced by gas atomiza-tion of the liquid metal or alloy.On impingement with thesubstrate,the species of the spray consolidate and solidifycompletely to produce a product that is essentially free ofporosity.The metallurgical characteristics of the spray-formed1This specification is under the jurisdi
13、ction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.10 on Stainless and Alloy Steel Tubular Products.Current edition approved March 1,2019.Published March 2019.Originallyapproved in 1995.Last previous edition approved in 2014 as
14、 A949/A949M 01(2014).DOI:10.1520/A0949_A0949M-01R19.2For 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.3Available fro
15、m American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-
16、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 product are controlled primarily by the thermal condition of thespray,and that of the surface of the metallic deposit formed onthe substrate.4.Ordering Information4.1
