ASTM A949/A949M-01

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Designation: A 949/A 949M – 01
Standard Specification for
Spray-Formed Seamless Ferritic/Austenitic Stainless Steel
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Pipe
This standard is issued under the fixed designationA 949/A 949M; 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 (e) indicates an editorial change since the last revision or reapproval.
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1. Scope Blooms, and Forgings
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E 527 Practice for Numbering Metals and Alloys (UNS)
1.1 Thisspecificationcoversspray-formedseamlessferritic/
2.2 ANSI/ASME Standards:
austenitic stainless steel pipe intended for general corrosive
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B 1.20.1 Pipe Threads, General Purpose
service, with particular emphasis on resistance to stress corro-
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B 36.10M-1995 Welded and Seamless Wrought Steel Pipe
sion cracking. These steels are susceptible to embrittlement if
B 36.19 Stainless Steel Pipe
used for prolonged periods at elevated temperatures.
2.3 Other Standard:
1.2 Optional supplementary requirements are provided for
SAE J1086 Practice for Numbering Metals and Alloys
pipe where a greater degree of testing is desired. These
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(UNS)
supplementaryrequirementscallforadditionalteststobemade
and when desired, one or more of these may be specified in the
3. Terminology
order.
3.1 Definitions:
1.3 AppendixX1ofthisspecificationliststhedimensionsof
3.1.1 Fordefinitionsoftermsusedinthisspecification,refer
seamless stainless steel pipe as shown in ANSI B 36.19. Pipe
to Terminology A 941.
having other dimensions may be furnished provided such pipe
3.2 Definitions of Terms Specific to This Standard:
complies with all other requirements of this specification.
3.2.1 spray-formed—denotes the fabrication of different
1.4 The values stated in either inch-pound units or SI units
shapes of a metallic material by deposition of a spray,
are to be regarded separately as standard. Within the text, the
consisting of droplets, solid particles, and particles that are
SI units are shown in brackets. The values stated in each
partially solid, onto a moving substrate.
system are not exact equivalents; therefore, each system must
3.2.1.1 Discussion—The spray is produced by gas atomiza-
be used independently of the other. Combining values from the
tion of the liquid metal or alloy. On impingement with the
two systems may result in nonconformance with the specifi-
substrate, the species of the spray consolidate and solidify
cation. The inch-pound units shall apply unless the “M”
completely to produce a product that is essentially free of
designation of this specification is specified in the order.
porosity. The metallurgical characteristics of the spray-formed
NOTE 1—The dimensionless designator NPS (nominal pipe size) has
productarecontrolledprimarilybythethermalconditionofthe
been substituted in this standard for such traditional terms as “nominal
spray, and that of the surface of the metallic deposit formed on
diameter,” “size,” and “nominal size.”
the substrate.
2. Referenced Documents
4. Ordering Information
2.1 ASTM Standards:
4.1 Orders for material under this specification should
A 450/A 450M Specification for General Requirements for
include the following, as required, to describe the desired
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Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
material adequately:
A 941 Terminology Relating to Steel, Stainless Steel, Re-
4.1.1 Quantity (feet, metres, or number of lengths),
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lated Alloys and Ferroalloys
4.1.2 Name of material (ferritic/austenitic steel pipe),
A 999/A 999M Specification for General Requirements for
4.1.3 Grade (Table 1),
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Alloy and Stainless Steel Pipe
4.1.4 Size (NPS designator or outside diameter and sched-
E 381 Method of Macroetch Testing Steel Bars, Billets,
ule number of average wall thickness, or other),
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This specification is under the jurisdiction of ASTM Committee A01 on Steel, Annual Book of ASTM Standards, Vol 03.01.
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Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee Available from American National Standards Institute, 11 West 42nd St., 13th
A01.10 on Stainless and Alloy Steel Tubular Products. Floor, New York, NY 10036, and ASME International, Three Park Avenue, New
Current edition approved March 10, 2001. Published June 2001. Originally York, NY 10016–5990.
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published as A 949/A 949M – 95. Last previous edition A 949/A 949M – 00a. Available from Society of Automotive Engineers, 400 Commonwealth Drive,
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Annual Book of ASTM Standards, Vol 01.01. Warrendale, PA 15096.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 949/A 949M – 01
TABLE 1 Heat Treatment
or surface finishing is not mandatory when pipe is bright
UNS
...