ASTM A959-00a
(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.
General Information
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Standards Content (Sample)
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Designation: A 959 – 00a An American National Standard
Standard Guide for
Specifying Harmonized Standard Grade Compositions for
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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 2.2 SAE Standards:
J 1086 Recommended Practice for Numbering Metals and
1.1 This standard provides a guide to ASTM Subcommittees
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Alloys
A01.06, A01.10, A01.17, A01.22, and A01.28 for specifying
HS-1086 FEB93 Metals and Alloys in the Unified Number-
chemical composition limits of wrought stainless steels. It is
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ing System
intended that these recommended grade composition limits be
suitable for adoption by other standardization bodies that
3. Terminology
prepare standards for stainless steel products.
3.1 Definitions of Terms Specific to This Standard:
1.2 Included in this guide are the recommendations for
3.1.1 austenitic grade, n— is a metallurgical term meaning
determining the number of significant figures for specifying
that the material is usually predominantly face-centered cubic
chemical composition from Test Methods, Practices and Ter-
in structure and hardenable only by cold working.
minology A 751.
3.1.2 austenitic-ferritic (duplex) grade, n—is a metallurgi-
1.3 All stainless steel UNS numbers and the stainless steel
cal term meaning that the material is a mixture of austenitic and
grades in all standards overseen by the aforementioned ASTM
ferritic structures, with at least one-fourth of the lesser phase,
subcommittees have been included, except those grades appli-
and hardenable only by cold working.
cable to restricted special end uses and alloys containing less
3.1.3 ferritic grade, n—is a metallurgical term meaning that
than 10.5 % minimum chromium.
the material is body-centered cubic in structure (with little, if
1.4 Not addressed are minor composition modifications
any, tempered martensite) and hardenable only slightly by cold
which a specific product subcommittee may find necessary to
working (responding little or only slightly to conventional heat
accommodate effects of normal processing or to enhance
treatment by quenching and tempering).
fabricability by the producer or user, or both.
3.1.4 martensitic grade, n—is a metallurgical term meaning
1.5 Also not generally addressed (except when established
that the material is capable of being produced in a distorted
by ASTM product subcommittees) is a complete rationalization
body-centered cubic structure by conventional heat treating
of all limits, especially when such would conflict with long-
and quenching, and that the quenched structure is capable of
standing practices and is not justified by special technical
conventional tempering. Martensitic grades are delivered in the
effect.
annealed (ferritic) condition or the hardened and tempered
1.6 Excluded from this guide are cast material and welding
(martensitic) condition.
filler metal.
3.1.5 precipitation hardening grade, n—is a metallurgical
2. Referenced Documents term meaning that the material may be basically austenitic or
martensitic in structure and hardenable by precipitation hard-
2.1 ASTM Standards:
ening (sometimes called age hardening).
A 751 Test Methods, Practices, and Terminology for
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3.1.6 standard stainless steel grade, n—the listed chemical
Chemical Analysis of Steel Products
2 composition associated with a stainless steel grade identified
E 527 Practice for Numbering Metals and Alloys (UNS)
by a particular UNS number appearing in SAE publication
HS-1086 FEB93, except as modified by an ASTM subcommit-
tee having oversight of a wrought stainless steel product where
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This guide is under the jurisdiction of ASTM Committee A01 on Steel, such a modification is justified by a specific technical effect.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.96 on Harmonization of Wrought Stainless Steel Requirements.
4. Significance and Use
Current edition approved Sept. 10, 2000. Published November 2000. Originally
4.1 It is anticipated that the ASTM Subcommittees A01.06,
published as A 959 – 96. Last previous edition A 959 – 00.
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Annual Book of ASTM Standards, Vol 01.01.
A01.10, A01.17, A01.22, and A01.28 will use the standard
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Available from Society of Automotive Engineers, Commonwealth Drive,
Warrendale, PA 15096.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
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A 959
composition limits listed in this guide for the grades identified 5.5 Silicon—Past practice has been to estab
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