ASTM A949/A949M-01(2019)
(Specification)Standard Specification for Spray-Formed Seamless Ferritic/Austenitic Stainless Steel Pipe
Standard Specification for Spray-Formed Seamless Ferritic/Austenitic Stainless Steel Pipe
ABSTRACT
This specification covers spray-formed seamless ferritic/austenitic stainless steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. The steel shall be made by the electric-furnace process and the pipe shall be made by the spray forming process using the melt from the primary melting. The as spray formed tubes shall be machined on both the inner and outer surfaces. All pipes shall be furnished in the heat-treated and descaled conditions. These pipes shall be free of contaminating iron particles. The specimens shall undergo transverse or longitudinal tension test, flattening test and hydrostatic test.
SCOPE
1.1 This specification covers spray-formed seamless ferritic/austenitic stainless steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.
1.2 Optional supplementary requirements are provided for pipe where a greater degree of testing is desired. These supplementary requirements call for additional tests to be made and when desired, one or more of these may be specified in the order.
1.3 Appendix X1 of this specification lists the dimensions of seamless stainless steel pipe as shown in ANSI B 36.19. Pipe having other dimensions may be furnished provided such pipe complies with all other requirements of this specification.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with 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.
Note 1: The dimensionless designator NPS (nominal pipe size) has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A949/A949M −01 (Reapproved 2019)
Standard Specification for
Spray-Formed Seamless Ferritic/Austenitic Stainless Steel
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Pipe
This standard is issued under the fixed designationA949/A949M; the number immediately following the designation indicates the year
of 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.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 Thisspecificationcoversspray-formedseamlessferritic/
A450/A450M Specification for General Requirements for
austenitic stainless steel pipe intended for general corrosive
Carbon and Low Alloy Steel Tubes
service, with particular emphasis on resistance to stress corro-
A941 TerminologyRelatingtoSteel,StainlessSteel,Related
sion cracking. These steels are susceptible to embrittlement if
Alloys, and Ferroalloys
used for prolonged periods at elevated temperatures.
A999/A999M Specification for General Requirements for
1.2 Optional supplementary requirements are provided for
Alloy and Stainless Steel Pipe
pipe where a greater degree of testing is desired. These
E381 Method of Macroetch Testing Steel Bars, Billets,
supplementaryrequirementscallforadditionalteststobemade
Blooms, and Forgings
and when desired, one or more of these may be specified in the
E527 Practice for Numbering Metals and Alloys in the
order.
Unified Numbering System (UNS)
2.2 ANSI/ASME Standards:
1.3 AppendixX1ofthisspecificationliststhedimensionsof
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B 1.20.1 Pipe Threads, General Purpose
seamless stainless steel pipe as shown in ANSI B 36.19. Pipe
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B 36.10M-1995 Welded and Seamless Wrought Steel Pipe
having other dimensions may be furnished provided such pipe
B 36.19 Stainless Steel Pipe
complies with all other requirements of this specification.
2.3 Other Standard:
1.4 The values stated in either SI units or inch-pound units
SAE J1086 Practice for Numbering Metals and Alloys
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are to be regarded separately as standard. The values stated in
(UNS)
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining 3. Terminology
values from the two systems may result in non-conformance
3.1 Definitions:
with the standard.
3.1.1 Fordefinitionsoftermsusedinthisspecification,refer
1.4.1 Within the text, the SI units are shown in brackets.
to Terminology A941.
1.4.2 The inch-pound units shall apply unless the “M”
3.2 Definitions of Terms Specific to This Standard:
designation of this specification is specified in the order.
3.2.1 spray-formed—denotes the fabrication of different
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
shapes of a metallic material by deposition of a spray,
been substituted in this standard for such traditional terms as “nominal
consisting of droplets, solid particles, and particles that are
diameter,” “size,” and “nominal size.”
partially solid, onto a moving substrate.
1.5 This international standard was developed in accor-
3.2.1.1 Discussion—The spray is produced by gas atomiza-
dance with internationally recognized principles on standard-
tion of the liquid metal or alloy. On impingement with the
ization established in the Decision on Principles for the
substrate, the species of the spray consolidate and solidify
Development of International Standards, Guides and Recom-
completely to produce a product that is essentially free of
mendations issued by the World Trade Organization Technical
porosity. The metallurgical characteristics of the spray-formed
Barriers to Trade (TBT) Committee.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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This specification is under the jurisdiction ofASTM Committee A01 on Steel, Standards volume information, refer to the standard’s Document Summary page on
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee the ASTM website.
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A01.10 on Stainless and Alloy Steel Tubular Products. Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
Current edition approved March 1, 2019. Published March 2019. Originally 4th Floor, New York, NY 10036, http://www.ansi.org.
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approved in 1995. Last previous edition approved in 2014 as A949/A949M – 01 Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
(2014). DOI: 10.1520/A0949_A0949M-01R19. PA 15096-0001, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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