ASTM A959-04
(Guide)Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
SCOPE
1.1 This standard provides a guide to ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 for specifying chemical composition limits of wrought stainless steels. It is intended that these recommended grade composition limits be suitable for adoption by other standardization bodies that prepare standards for stainless steel products.
1.2 Included in this guide are the recommendations for determining the number of significant figures for specifying chemical composition from Test Methods, Practices and Terminology A 751.
1.3 All stainless steel UNS numbers and the stainless steel grades in all standards overseen by the aforementioned ASTM subcommittees have been included, except those grades applicable to restricted special end uses and alloys containing less than 10.5 % minimum chromium.
1.4 Not addressed are minor composition modifications which a specific product subcommittee may find necessary to accommodate effects of normal processing or to enhance fabricability by the producer or user, or both.
1.5 Also not generally addressed (except when established by ASTM product subcommittees) is a complete rationalization of all limits, especially when such would conflict with long-standing practices and is not justified by special technical effect.
1.6 Excluded from this guide are cast material and welding filler metal.
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Designation:A959–04
Standard Guide for
Specifying Harmonized Standard Grade Compositions for
1
Wrought Stainless Steels
This standard is issued under the fixed designation A 959; 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.
1. Scope* J 1086 Recommended Practice for Numbering Metals and
3
Alloys
1.1 This document provides a guide to ASTM Subcommit-
HS-1086 Metals and Alloys in the Unified Numbering
tees A01.06, A01.10, A01.17, A01.22, and A01.28 for speci-
3
System
fying chemical composition limits of wrought stainless steels.
Itisintendedthattheserecommendedgradecompositionlimits
3. Terminology
be suitable for adoption by other standardization bodies that
3.1 Definitions of Terms Specific to This Standard:
prepare standards for stainless steel products.
3.1.1 austenitic grade, n—metallurgical term meaning that
1.2 Included in this guide are the recommendations for
the material is usually predominantly face-centered cubic in
determining the number of significant figures for specifying
structure and hardenable only by cold working.
chemical composition from Test Methods, Practices, and Ter-
3.1.2 austenitic-ferritic (duplex) grade, n—metallurgical
minology A 751.
term meaning that the material is a mixture of austenitic and
1.3 All stainless steel UNS numbers and the stainless steel
ferritic structures, with at least one-fourth of the lesser phase,
grades in all standards overseen by the aforementionedASTM
and hardenable only by cold working.
subcommittees have been included, except those grades appli-
3.1.3 ferritic grade, n—metallurgical term meaning that the
cable to restricted special end uses and alloys containing less
material is body-centered cubic in structure (with little, if any,
than 10.5 % minimum chromium.
tempered martensite) and hardenable only slightly by cold
1.4 Not addressed are minor composition modifications
working (responding little or only slightly to conventional heat
which a specific product subcommittee may find necessary to
treatment by quenching and tempering).
accommodate effects of normal processing or to enhance
3.1.4 martensitic grade, n—metallurgicaltermmeaningthat
fabricability by the producer or user, or both.
the material is capable of being produced in a distorted
1.5 Also not generally addressed (except when established
body-centered cubic structure by conventional heat treating
byASTMproductsubcommittees)isacompleterationalization
and quenching, and that the quenched structure is capable of
of all limits, especially when such would conflict with long-
conventionaltempering.Martensiticgradesaredeliveredinthe
standing practices and is not justified by special technical
annealed (ferritic) condition or the hardened and tempered
effect.
(martensitic) condition.
1.6 Excluded from this guide are cast material and welding
3.1.5 precipitation hardening grade, n—metallurgical term
filler metal.
meaning that the material may be basically austenitic or
2. Referenced Documents martensitic in structure and hardenable by precipitation hard-
2 ening (sometimes called age hardening).
2.1 ASTM Standards:
3.1.6 standard stainless steel grade, n—listed chemical
A 751 Test Methods, Practices, and Terminology for
composition associated with a stainless steel grade identified
Chemical Analysis of Steel Products
by a particular UNS number appearing in SAE publication
E 527 Practice for Numbering Metals and Alloys (UNS)
HS-1086, except as modified by an ASTM subcommittee
2.2 SAE Standards:
having oversight of a wrought stainless steel product where
such a modification is justified by a specific technical effect.
1
This guide is under the jurisdiction of ASTM Committee A01 on Steel,
4. Significance and Use
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.17 on Flat-Rolled and Wrought Stainless Steel. 4.1 It is anticipated that the ASTM Subcommittees A01.06,
Current edition approved Sept. 1, 2004. Published September 2004. Originally
A01.10, A01.17, A01.22, and A01.28 will use the standard
approved in 1996. Last previous edition approved in 2003 as A 959-03.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from Society of Automotive Engineers (SAE), 400 Commonwealth
the ASTM website. Dr., Warrendale, PA 15096-0001.
*A Summary of Changes section appears at the end of this standard.
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