ASTM A959-19

Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels

SIGNIFICANCE AND USE
4.1 It is anticipated that the ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 will use the standard composition limits listed in this guide for the grades identified by the corresponding UNS designation in the product specification unless there is a specific technical justification for doing otherwise. The compositions in this guide shall not be considered as chemical requirements for any particular product until adopted by the subcommittee overseeing that product.  
4.2 Assuming that uniform compositions among the many product standards for stainless steel are desirable, the composition limits provided in this standard are to be used as guides in determining limits for each of the elements included in the total composition of each grade. The composition limits have been established with the intent that each product subcommittee will find it necessary to require only a minimum number of changes to reflect specific technical effects. Section 5 lists the general guidelines followed for determining the limits for each element; the limits established in this guide are based on these guidelines.  
4.3 Not included in this standard stainless steel grade harmonization effort is an attempt to unify stainless steel compositions in ASTM product standards by any means other than recognizing current industry practices.
SCOPE
1.1 This guide 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 A751.  
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.  
1.7 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

• Status: Published
• Publication Date: 14-Nov-2019
• ICS: 77.140.20 - Stainless steels
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.17 - Flat-Rolled and Wrought Stainless Steel

Relations

• Replaces: ASTM A959-16 - Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
• Effective Date: 15-Nov-2019
• Refers: ASTM A751-14 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-Mar-2014
• Refers: ASTM A751-08 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-Oct-2008
• Refers: ASTM A751-07a - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-Jun-2007
• Refers: ASTM A751-07 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-Apr-2007
• Refers: ASTM A751-01(2006) - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 01-May-2006
• Refers: ASTM E527-83(2003) - Standard Practice for Numbering Metals and Alloys (UNS)
• Effective Date: 10-Apr-2003
• Refers: ASTM A751-96 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 10-Sep-2001
• Refers: ASTM A751-01 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
• Effective Date: 10-Sep-2001
• Refers: ASTM E527-83(1997)e1 - Standard Practice for Numbering Metals and Alloys (UNS)
• Effective Date: 10-Mar-1997
• Referred By: ASTM A1040-17(2022) - Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Carbon, Low-Alloy, and Alloy Steels
• Effective Date: 15-Nov-2019
• Referred By: ASTM A582/A582M-22 - Standard Specification for Free-Machining Stainless Steel Bars
• Effective Date: 15-Nov-2019

Overview

ASTM A959-19: Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels is a key ASTM International document that provides guidance on the recommended chemical composition limits for grades of wrought stainless steel. The main aim of ASTM A959-19 is to harmonize the standard grade compositions across various ASTM stainless steel product standards, aiding consistent material quality and facilitating international standardization.

This guide is primarily intended for ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28, but its harmonized recommendations are also suited for adoption by other organizations preparing stainless steel standards. The guidance covers all stainless steel grades identified by Unified Numbering System (UNS) designations, except those for specialized end-uses or containing less than 10.5% minimum chromium. It specifically excludes cast materials and welding filler metals.

Key Topics

• Harmonized Composition Limits
  ASTM A959-19 establishes unified limits for key elements in wrought stainless steel grades, including carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, molybdenum, nitrogen, copper, niobium (columbium), tantalum, and others.

• Subcommittee Use
  The guide is designed for use by relevant ASTM subcommittees responsible for setting chemical composition limits in product specifications. Compositions are not enforceable until specifically adopted within a product standard.

• Consistency Across Product Standards
  By recommending harmonized composition ranges, ASTM A959-19 helps achieve uniformity across different product standards, reducing unnecessary variations and supporting global compatibility.

• Guidelines for Specifying Elements
  The guide outlines general principles for setting limits on chemical elements, referencing industry norms, required precision, and technical justifications for exceptions.

• Significant Figures and Data Precision
  Recommendations are included for determining the number of significant figures in chemical specifications, with reference to ASTM A751.

Applications

• Product Standard Development
  Subcommittees and industry organizations use ASTM A959-19 to define or revise chemical composition requirements in wrought stainless steel product standards.

• Material Specification in Manufacturing
  Engineers, quality managers, and procurement professionals refer to the harmonized limits when sourcing or qualifying stainless steel for diverse applications, ensuring consistent quality and meeting international requirements.

• Facilitating International Trade
  Harmonized grade compositions help streamline cross-border trade of stainless steel products by aligning chemical requirements to recognized international practices.

• Basis for National and Cross-Industry Adoption
  ASTM A959-19 serves as a benchmark for other standardization bodies looking to align with globally accepted wrought stainless steel grade compositions.

Related Standards

• ASTM A751 – Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
  Provides test methods and terminology referenced in determining composition limits.

• ASTM E527 – Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
  Establishes the UNS designation system for grades included in this guide.

• SAE J1086 – Recommended Practice for Numbering Metals and Alloys
  Another key resource for UNS numbering, closely aligned with ASTM A959-19.

• ASTM A240/A240M, ASTM A276, ASTM A479, and other stainless steel product specifications
  These are the main product standards where the harmonized composition limits are implemented once adopted by the responsible subcommittee.

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Keywords: ASTM A959, stainless steel compositions, harmonized stainless steel grades, chemical composition limits, ASTM standards, UNS designations, wrought stainless steels, grade specification, steel standardization, subcommittee A01.06, A01.10, A01.17, A01.22, A01.28.

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: A959 − 19
Standard Guide for
Specifying Harmonized Standard Grade Compositions for
Wrought Stainless Steels
This standard is issued under the fixed designation A959; 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
2.1 ASTM Standards:
1.1 This guide provides a guide to ASTM Subcommittees
A01.06, A01.10, A01.17, A01.22, and A01.28 for specifying A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
chemical composition limits of wrought stainless steels. It is
intended that these recommended grade composition limits be E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)
suitable for adoption by other standardization bodies that
prepare standards for stainless steel products. 2.2 SAE Standards:
J 1086 Recommended Practice for Numbering Metals and
1.2 Included in this guide are the recommendations for
Alloys
determining the number of significant figures for specifying
HS-1086 Metals and Alloys in the Unified Numbering Sys-
chemical composition from Test Methods, Practices, and Ter-
tem
minology A751.
1.3 All stainless steel UNS numbers and the stainless steel 3. Terminology
grades in all standards overseen by the aforementionedASTM
3.1 Definitions of Terms Specific to This Standard:
subcommittees have been included, except those grades appli-
3.1.1 austenitic grade, n—metallurgical term meaning that
cable to restricted special end uses and alloys containing less
the material is usually predominantly face-centered cubic in
than 10.5 % minimum chromium.
structure and hardenable only by cold working.
1.4 Not addressed are minor composition modifications
3.1.2 austenitic-ferritic (duplex) grade, n—metallurgical
which a specific product subcommittee may find necessary to
term meaning that the material is a mixture of austenitic and
accommodate effects of normal processing or to enhance
ferritic structures, with at least one-fourth of the lesser phase,
fabricability by the producer or user, or both.
and hardenable only by cold working.
1.5 Also not generally addressed (except when established 3.1.3 ferritic grade, n—metallurgical term meaning that the
byASTMproductsubcommittees)isacompleterationalization
material is body-centered cubic in structure (with little, if any,
of all limits, especially when such would conflict with long- tempered martensite) and hardenable only slightly by cold
standing practices and is not justified by special technical
working (responding little or only slightly to conventional heat
effect. treatment by quenching and tempering).
3.1.4 martensitic grade, n—metallurgical term meaning that
1.6 Excluded from this guide are cast material and welding
the material is capable of being produced in a distorted
filler metal.
body-centered cubic structure by conventional heat treating
1.7 This international standard was developed in accor-
and quenching, and that the quenched structure is capable of
dance with internationally recognized principles on standard-
conventionaltempering.Martensiticgradesaredeliveredinthe
ization established in the Decision on Principles for the
annealed (ferritic) condition or the hardened and tempered
Development of International Standards, Guides and Recom-
(martensitic) condition.
mendations issued by the World Trade Organization Technical
3.1.5 precipitation hardening grade, n—metallurgical term
Barriers to Trade (TBT) Committee.
meaning that the material may be basically austenitic or
1 2
This guide is under the jurisdiction of ASTM Committee A01 on Steel, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
A01.17 on Flat-Rolled and Wrought Stainless Steel. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Nov. 15, 2019. Published November 2019. Originally the ASTM website.
approved in 1996. Last previous edition approved in 2016 as A959 – 16. DOI: Available from Society of Automotive Engineers (SAE), 400 Commonwealth
10.1520/A0959-19. Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A959 − 19
martensitic in structure and hardenable by precipitation hard- lower limit for specific technical effect. Exception—some of
ening (sometimes called age hardening). the Cr-Ni-Mn austenitic grades have always been produced to
0.060 % maximum.
3.1.6 standard stainless steel grade, n—listed chemical
composition associated with a stainless steel grade identified
5.4 Sulfur—It is recommended that 0.030 % maximum be
by a particular UNS number appearing in SAE publication
applied to all grades except the free-machining grades unless
HS-1086, except as modified by an ASTM subcommittee
lower limits have been required for specific technical effects.
having oversight of a wrought stainless steel product where
5.5 Silicon—Past practice has been to establish 0.75 %
such a modification is justified by a specific technical effect.
maximum for tubular related products such as flat rolled and
tubulars, and 1.00 % maximum for long products and forgings.
4. Significance and Use
For grades produced both as long and flat-rolled products, 1 %
4.1 It is anticipated that the ASTM Subcommittees A01.06,
maximum was chosen since it will also include products
A01.10, A01.17, A01.22, and A01.28 will use the standard
melted to lower limits. Use of lower or higher limits should be
composition limits listed in this guide for the grades identified
based on specific technical effect.
by the corresponding UNS designation in the product specifi-
5.6 Chromium—A composition spread of 2 % is recom-
cation unless there is a specific technical justification for doing
mended; existing broader limits were not reduced to less than
otherwise. The compositions in this guide shall not be consid-
a 3 % spread.
ered as chemical requirements for any particular product until
adopted by the subcommittee overseeing that product.
5.7 Nickel—It is recommended that the composition spread
not exceed 3 % unless a broader (generally higher) spread is
4.2 Assuming that uniform compositions among the many
justified by specific technical effect.
product standards for stainless steel are desirable, the compo-
sition limits provided in this standard are to be used as guides 5.8 Molybdenum—It is recommended that the composition
in determining limits for each of the elements included in the
spread not exceed 1 %, unless a broader range is justified by
total composition of each grade. The composition limits have specific technical effect. Molybdenum limits having only a
been established with the intent that each product subcommit-
maximum limit but no minimum should not be used unless
tee will find it necessary to require only a minimum number of justified by specific technical effect.
changes to reflect specific technical effects. Section 5 lists the
5.9 Nitrogen—Itisrecommendedthatnitrogenlimitshaving
general guidelines followed for determining the limits for each
only a maximum limit but no minimum should not be used
element; the limits established in this guide are based on these
unless justified by specific technical effect.
guidelines.
5.10 Copper—It is recommended that copper limits having
4.3 Not included in this standard stainless steel grade
only a maximum limit but no minimum should not be used
harmonization effort is an attempt to unify stainless steel
unless justified by specific technical effect.
compositions in ASTM product standards by any means other
5.11 Columbium and Tantalum—Except for special applica-
than recognizing current industry practices.
tions requiring positive identification of tantalum, it is recom-
5. General Guidelines Used for Determining Composition mended that prior listings of these two elements together be
limited to listing only columbium. The words “columbium”
Limits
and “niobium” refer to the same element.
5.1 Carbon—It is recommended that limits be to only two
decimal places for levels of 0.04 % and higher because it is not
6. Harmonized Standard Grade Stainless Steel
necessary to control to such precision at levels above 0.04 %.
Compositions
(It should be recognized that limits such as 0.045 % maximum
6.1 The harmonized composition limits are shown in Table
may also be simply stated as 0.04 % maximum.) It is also
1, grouped by metallurgical classification, that is, austenitic,
recommended that three decimal places be used at levels of
austenitic-ferritic, and so forth.Within those groups, grades are
0.030 %andlower,unless,forexample,itisclearlyrecognized
listed by UNS designation, in numerical order.
that 0.03 % maximum means that 0.035 % is satisfactory.
6.2 Unless adopted by the appropriate product subcommit-
5.2 Manganese—Except for the Cr-Ni-Mn grades
tee in a product standard, the compositions described in this
(S2XXXX), it is recommended that limits of 2 % maximum
guide shall not be used for specifying an ASTM product.
and 1 % maximum be used for the austenitic and other grades
respectively, except for the free machining grades with high 7. Keywords
sulfur or selenium, or when necessary to promote nitrogen
7.1 austenitic stainless steels; austenitic-ferritic or ferritic-
solubility.
austenitic stainless steels; duplex stainless steels; ferritic stain-
5.3 Phosphorus—It is recommended that 0.045 % maxi- less steels; harmonized stainless steel compositions; marten-
mum be applied to austenitic grades, and 0.040 % maximum to sitic stainless steels; precipitation hardening stainless steels;
other grades unless the sponsoring producer recommends a standard stainless steel grade compositions
A959 − 19
A
TABLE 1 Chemical Composition Limits, %
UNS
C
Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickle Molybdenum Nitrogen Copper Other Elements
B
Designation
Austenitic Grades
D
S16800 16-8-2H 0.05–0.10 2.00 0.045 0.030 1.00 14.5–16.5 7.5–9.5 1.50–2.00 . . . . . . . . .
S20100 201 0.15 5.5–7.5 0.060 0.030 1.00 16.0–18.0 3.5–5.5 . . . 0.25 . . . . . .
S20103 201L 0.03 5.5–7.5 0.045 0.030 1.00 16.0–18.0 3.5–5.5 . . . 0.25 . . . . . .
D
S20153 201LN 0.03 6.4–7.5 0.045 0.015 1.00 16.0–17.5 4.0–5.0 . . . 0.10–0.25 1.00 . . .
S20161 . . . 0.15 4.0–6.0 0.045 0.030 3.0–4.0 15.0–18.0 4.0–6.0 . . . 0.08–0.20 . . . . . .
S20162 . . . 0.15 4.0–8.0 0.040 0.040 2.5–4.5 16.5–21.0 6.0–10.0 0.50–2.50 0.05–0.25 . . . . . .
S20200 202 0.15 7.5–10.0 0.060 0.030 1.00 17.0–19.0 4.0–6.0 . . . 0.25 . . . . . .
E
S20300 XM-1 0.08 5.0–6.5 0.045 0.18–0.35 1.00 16.0–18.0 5.0–6.5 . . . . . . 1.75–2.2 . . .
S20400 . . . 0.030 7.0–9.0 0.045 0.030 1.00 15.0–17.0 1.50–3.00 . . . 0.15–0.30 . . . . . .
S20430 . . . 0.15 6.5–9.0 0.060 0.030 1.00 15.5–17.5 1.50–3.50 . . . 0.05–0.25 2.0–4.0 . . .
S20431 . . . 0.12 5.0–7.0 0.045 0.030 1.00 17.0–18.0 2.0–4.0 . . . 0.10–0.25 1.50–3.50 . . .
S20432 . . . 0.08 3.0–5.0 0.045 0.030 1.00 17.0–18.0 4.0–6.0 . . . 0.05–0.20 2.00–3.00 . . .
S20433 . . . 0.08 5.5–7.5 0.045 0.030 1.00 17.0–18.0 3.5–5.5 . . . 0.10–0.25 1.50–3.50 . . .
S20500 205 0.12–0.25 14.0–15.0 0.060 0.030 1.00 16.5–18.0 1.00–1.75 . . . 0.32–0.40 . . . . . .
E H
S20910 XM-19 0.06 4.0–6.0 0.045 0.030 1.00 20.5–23.5 11.5–13.5 1.50–3.00 0.20–0.40 . . . Nb 0.10–0.30,
V 0.10–0.30
E
S21400 XM-31 0.12 14.0–16.0 0.045 0.030 0.30–1.00 17.0–18.5 1.00 . . . 0.35 min . . . . . .
E
S21460 XM-14 0.12 14.0–16.0 0.060 0.030 1.00 17.0–19.0 5.0–6.0 . . . 0.35–0.50 . . . . . .
S21500 . . . 0.06–0.15 5.5–7.0 0.045 0.030 0.2–1.0 14.0–16.0 9.0–11.0 0.80–1.20 . . . . . . Nb 0.75–1.25,
V 0.15–0.40,
B 0.003–0.009
E
S21600 XM-17 0.08 7.5–9.0 0.045 0.030 1.00 17.5–20.5 5.0–7.0 2.00–3.00 0.25–0.50 . . . . . .
E
S21603 XM-18 0.03 7.5–9.0 0.045 0.030 1.00 17.5–20.5 5.0–7.0 2.00–3.00 0.25–0.50 . . . . . .
S21640 . . . 0.08 3.5–6.5 0.060 0.030 1.00 17.5–19.5 4.0–6.5 0.50–2.00 0.08–0.30 . . . Nb 0.10–1.00
S21800 . . . 0.10 7.0–9.0 0.060 0.030 3.5–4.5 16.0–18.0 8.0–9.0 . . . 0.08–0.18 . . . . . .
E
S21900 XM-10 0.08 8.0–10.0 0.045 0.030 1.00 19.0–21.5 5.5–7.5 . . . 0.15–0.40 . . . . . .
E
S21904 XM-11 0.04 8.0–10.0 0.045 0.030 1.00 19.0–21.5 5.5–7.5 . . . 0.15–0.40 . . . . . .
E
S24000 XM-29 0.08 11.5–14.5 0.060 0.030 1.00 17.0–19.0 2.3–3.7 . . . 0.20–0.40 . . . . . .
E
S24100 XM-28 0.15 11.0–14.0 0.045 0.030 1.00 16.5–19.0 0.50–2.50 . . . 0.20–0.45 . . . . . .
S28200 . . . 0.15 17.0–19.0 0.045 0.030 1.00 17.0–19.0 . . . 0.75–1.25 0.40–0.60 0.75–1.25 . . .
S30100 301 0.15 2.00 0.045 0.030 1.00 16.0–18.0 6.0–8.0 . . . 0.10 . . . . . .
D
S30103 301L 0.030 2.00 0.045 0.030 1.00 16.0–18.0 5.0–8.0 . . . 0.20 . . . . . .
S30116 301Si 0.15 2.00 0.045 0.030 1.00–1.35 16.0–18.0 6.0–8.0 1.00 0.20 . . . . . .
D
S30153 301LN 0.030 2.00 0.045 0.030 1.00 16.0–18.0 5.0–8.0 . . . 0.07–0.20 . . . . . .
S30200 302 0.15 2.00 0.045 0.030 1.00 17.0–19.0 8.0–10.0 . . . 0.10 . . . . . .
S30215 302B 0.15 2.00 0.045 0.030 2.00–3.00 17.0–19.0 8.0–10.0 . . . 0.10 . . . . . .
S30300 303 0.15 2.00 0.20 0.15 min 1.00 17.0–19.0 8.0–10.0 . . . . . . . . . . . .
E
S30310 XM-15 0.15 2.5–4.5 0.20 0.25 min 1.00 17.0–19.0 7.0–9.0 . . . . . . . . . . . .
S30323 303Se 0.15 2.00 0.20 0.06 1.00 17.0–19.0 8.0–10.0 . . . . . . . . . Se 0.15 min
E
S30345 XM-2 0.15 2.00 0.05 0.11–0.16 1.00 17.0–19.0 8.0–10.0 0.40–0.60 . . . . . . Al 0.60–1.00
S30400 304 0.07 2.00 0.045 0.030 1.00 17.5–19.5 8.0–11.0 . . . . . . . . . . . .
S30403 304L 0.030 2.00 0.045 0.030 1.00 17.5–19.5 8.0–12.0 . . . . . . . . . . . .
S30409 304H 0.04–0.10 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . . . . . . . . . .
S30415 . . . 0.04–0.06 0.80 0.045 0.030 1.00–2.00 18.0–19.0 9.0–10.0 . . . 0.12–0.18 . . . Ce 0.03–0.08
S30430 . . . 0.03 2.00 0.045 0.030 1.00 17.0–19.0 8.0–10.0 . . . . . . 3.0–4.0 . . .
S30432 . . . 0.07–0.13 0.50 0.045 0.030 0.30 17.0–19.0 7.5–10.5 . . . 0.05–0.12 2.5–3.5 Nb 0.20–0.60,
Al 0.003–0.030,
B 0.001–0.010
G
S30434 . . . 0.07–0.14 2.00 0.040 0.010 1.00 17.5–19.5 9.0–12.0 . . . . . . 2.50–3.50 Nb 0.10–0.40 ,
G
Ti 0.10–0.25 ,
B 0.001–0.004
S30435 . . . 0.08 2.00 0.045 0.030 1.00 16.0–18.0 7.0–9.0 . . . . . . 1.50–3.00 . . .
S30441 . . . 0.08 2.00 0.045 0.030 1.0–2.0 17.5–19.5 8.0–10.5 . . . 0.10 1.5–2.5 Nb 0.1–0.5,
W 0.2–0.8
S30451 304N 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.10–0.16 . . . . . .
E
S30452 XM-21 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–10.0 . . . 0.16–0.30 . . . . . .

A959 − 19
TABLE 1 Continued
UNS
C
Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickle Molybdenum Nitrogen Copper Other Elements
B
Designation
S30453 304LN 0.030 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.10–0.16 . . . . . .
D
S30454 304LHN 0.03 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.16–0.30 . . . . . .
S30500 305 0.12 2.00 0.045 0.030 1.00 17.0–19.0 11.0–13.0 . . . . . . . . . . . .
S30530 . . . 0.08 2.00 0.045 0.030 0.50–2.50 17.0–20.5 8.5–11.5 0.75–1.50 . . . 0.75–3.50 . . .
S30600 . . . 0.018 2.00 0.020 0.020 3.7–4.3 17.0–18.5 14.0–15.5 0.20 . . . 0.50 . . .
S30601 . . . 0.015 0.50–0.80 0.030 0.013 5.0–5.6 17.0–18.0 17.0–18.0 0.20 0.05 0.35 . . .
S30615 . . . 0.16–0.24 2.00 0.030 0.030 3.2–4.0 17.0–19.5 13.5–16.0 . . . . . . . . . Al 0.80–1.50
S30800 308 0.08 2.00 0.045 0.030 1.00 19.0–21.0 10.0–12.0 . . . . . . . . . . . .
S30815 . . . 0.05–0.10 0.80 0.040 0.030 1.40–2.00 20.0–22.0 10.0–12.0 . . . 0.14–0.20 . . . Ce 0.03–0.08
S30900 309 0.20 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
S30908 309S 0.08 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
D
S30909 309H 0.04–0.10 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
D
S30925 309LMoN 0.025 2.00 0.040 0.030 0.70 23.0–26.0 13.0–16.0 0.5–1.2 0.25–0.40 . . . . . .
D
S30940 309Nb 0.08 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10×C min, 1.10 max
D
S30941 309HNb 0.04–0.10 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10×C min, 1.10 max
S30942 . . . 0.03–0.10 2.00 0.040 0.030 1.00 21.0–23.0 14.5–16.5 0.10–0.20 . . . . . . Nb 0.50–0.80,
B 0.001–0.005
D
S31000 310 0.25 2.00 0.045 0.030 1.50 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
S31002 . . . 0.015 2.00 0.020 0.015 0.15 24.0–26.0 19.0–22.0 0.10 0.10 . . . . . .
S31008 310S 0.08 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
D
S31009 310H 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
D
S31025 310MoNbN 0.10 1.50 0.030 0.030 1.00 19.5–23.0 23.0–26.0 1.0–2.0 0.10–0.25 . . . Nb 0.10–0.40,
Ti 0.20,
B 0.002–0.010
S31035 . . . 0.04–0.10 0.60 0.025 0.015 0.40 21.5–23.5 23.5–26.5 . . . 0.20–0.30 2.5–3.5 Nb 0.40–0.60,
W 3.0–4.0,
Co 1.0–2.0,
B 0.002–0.008
D
S31040 310Nb 0.08 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10×C min, 1.10 max
D
S31041 310HNb 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10×C 1.10
D
S31042 310HNbN 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . 0.15–0.35 . . . Nb 0.20–0.60
D
S31050 310MoLN 0.030 2.00 0.030 0.015 0.40 24.0–26.0 21.0–23.0 2.00–3.00 0.10–0.16 . . .
S31060 . . . 0.05–0.10 1.00 0.040 0.030 0.50 22.0–24.0 10.0–12.5 . . . 0.18–0.25 . . . (Ce+La) 0.025 min, 0.070 max;
B 0.001–0.010
S31254 . . . 0.020 1.00 0.030 0.010 0.80 19.5–20.5 17.5–18.5 6.0–6.5 0.18–0.22 0.50–1.00 . . .
S31266 . . . 0.030 2.0–4.0 0.035 0.020 1.00 23.0–25.0 21.0–24.0 5.2–6.2 0.35–0.60 1.00–2.50 W 1.50–2.50
S31272 . . . 0.08–0.12 1.50–2.00 0.030 0.015 0.30–0.70 14.0–16.0 14.0–16.0 1.00–1.40 . . . . . . Ti 0.30–0.60,
B 0.004–0.008
S31277 . . . 0.020 3.00 0.030 0.010 0.50 20.5–23.0 26.0–28.0 6.5–8.0 0.30–0.40 0.50–1.50 . . .
D
S31400 314 0.25 2.00 0.045 0.030 1.50–3.00 23.0–26.0 19.0–22.0 . . . . . . . . . . . .
S31600 316 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
S31603 316L 0.030 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
S31609 316H 0.04–0.10 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
D
S31635 316Ti 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Ti 5×(C+N) min, 0.70 max
D
S31640 316Nb 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Nb 10×C min, 1.10 max
S31651 316N 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.10–0.16 . . . . . .
S31653 316LN 0.030 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.10–0.16 . . . . . .
D
S31654 316LHN 0.03 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.16–0.30 . . . . . .
S31700 317 0.08 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0–4.0 . . . . . . . . .
D
S31703 317L 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0–4.0 . . . . . . . . .
S31725 317LM 0.030 2.00 0.045 0.030 1.00 18.0–20.0 13.5–17.5 4.0–5.0 0.20 . . . . . .
S31726 317LMN 0.030 2.00 0.045 0.030 1.00 17.0–20.0 13.5–17.5 4.0–5.0 0.10–0.20 . . . . . .
S31727 . . . 0.030 1.00 0.030 0.030 1.00 17.5–19.0 14.5–16.5 3.8–4.5 0.15–0.21 2.8–4.0 . . .
D
S31753 317LN 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–14.0 3.0–4.0 0.10–0.22 . . . . . .
S32050 . . . 0.030 1.50 0.035 0.020 1.00 22.0–24.0 20.0–23.0 6.0–6.8 0.21–0.32 0.40 . . .
S32053 . . . 0.030 1.00 0.030 0.010 1.00 22.0–24.0 24.0–26.0 5.0–6.0 0.17–0.22 . . . .
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A959 − 16 A959 − 19
Standard Guide for
Specifying Harmonized Standard Grade Compositions for
Wrought Stainless Steels
This standard is issued under the fixed designation A959; 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*
1.1 This guide 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 A751.
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.
1.7 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.
2. Referenced Documents
2.1 ASTM Standards:
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
2.2 SAE Standards:
J 1086 Recommended Practice for Numbering Metals and Alloys
HS-1086 Metals and Alloys in the Unified Numbering System
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 austenitic grade, n—metallurgical term meaning that the material is usually predominantly face-centered cubic in structure
and hardenable only by cold working.
3.1.2 austenitic-ferritic (duplex) grade, n—metallurgical term meaning that the material is a mixture of austenitic and ferritic
structures, with at least one-fourth of the lesser phase, and hardenable only by cold working.
This guide is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee A01.17 on
Flat-Rolled and Wrought Stainless Steel.
Current edition approved Sept. 1, 2016Nov. 15, 2019. Published October 2016November 2019. Originally approved in 1996. Last previous edition approved in 20112016
as A959 – 11.A959 – 16. DOI: 10.1520/A0959-16.10.1520/A0959-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://www.sae.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A959 − 19
3.1.3 ferritic grade, n—metallurgical term meaning that the material is body-centered cubic in structure (with little, if any,
tempered martensite) and hardenable only slightly by cold working (responding little or only slightly to conventional heat
treatment by quenching and tempering).
3.1.4 martensitic grade, n—metallurgical term meaning that the material is capable of being produced in a distorted
body-centered cubic structure by conventional heat treating and quenching, and that the quenched structure is capable of
conventional tempering. Martensitic grades are delivered in the annealed (ferritic) condition or the hardened and tempered
(martensitic) condition.
3.1.5 precipitation hardening grade, n—metallurgical term meaning that the material may be basically austenitic or martensitic
in structure and hardenable by precipitation hardening (sometimes called age hardening).
3.1.6 standard stainless steel grade, n—listed chemical composition associated with a stainless steel grade identified by a
particular UNS number appearing in SAE publication HS-1086, except as modified by an ASTM subcommittee having oversight
of a wrought stainless steel product where such a modification is justified by a specific technical effect.
4. Significance and Use
4.1 It is anticipated that the ASTM Subcommittees A01.06, A01.10, A01.17, A01.22, and A01.28 will use the standard
composition limits listed in this guide for the grades identified by the corresponding UNS designation in the product specification
unless there is a specific technical justification for doing otherwise. The compositions in this guide shall not be considered as
chemical requirements for any particular product until adopted by the subcommittee overseeing that product.
4.2 Assuming that uniform compositions among the many product standards for stainless steel are desirable, the composition
limits provided in this standard are to be used as guides in determining limits for each of the elements included in the total
composition of each grade. The composition limits have been established with the intent that each product subcommittee will find
it necessary to require only a minimum number of changes to reflect specific technical effects. Section 5 lists the general guidelines
followed for determining the limits for each element; the limits established in this guide are based on these guidelines.
4.3 Not included in this standard stainless steel grade harmonization effort is an attempt to unify stainless steel compositions
in ASTM product standards by any means other than recognizing current industry practices.
5. General Guidelines Used for Determining Composition Limits
5.1 Carbon—It is recommended that limits be to only two decimal places for levels of 0.04 % and higher because it is not
necessary to control to such precision at levels above 0.04 %. (It should be recognized that limits such as 0.045 % maximum may
also be simply stated as 0.04 % maximum.) It is also recommended that three decimal places be used at levels of 0.030 % and
lower, unless, for example, it is clearly recognized that 0.03 % maximum means that 0.035 % is satisfactory.
5.2 Manganese—Except for the Cr-Ni-Mn grades (S2XXXX), it is recommended that limits of 2 % maximum and 1 %
maximum be used for the austenitic and other grades respectively, except for the free machining grades with high sulfur or
selenium, or when necessary to promote nitrogen solubility.
5.3 Phosphorus—It is recommended that 0.045 % maximum be applied to austenitic grades, and 0.040 % maximum to other
grades unless the sponsoring producer recommends a lower limit for specific technical effect. Exception—some of the Cr-Ni-Mn
austenitic grades have always been produced to 0.060 % maximum.
5.4 Sulfur—It is recommended that 0.030 % maximum be applied to all grades except the free-machining grades unless lower
limits have been required for specific technical effects.
5.5 Silicon—Past practice has been to establish 0.75 % maximum for tubular related products such as flat rolled and tubulars,
and 1.00 % maximum for long products and forgings. For grades produced both as long and flat-rolled products, 1 % maximum
was chosen since it will also include products melted to lower limits. Use of lower or higher limits should be based on specific
technical effect.
5.6 Chromium—A composition spread of 2 % is recommended; existing broader limits were not reduced to less than a 3 %
spread.
5.7 Nickel—It is recommended that the composition spread not exceed 3 % unless a broader (generally higher) spread is justified
by specific technical effect.
5.8 Molybdenum—It is recommended that the composition spread not exceed 1 %, unless a broader range is justified by specific
technical effect. Molybdenum limits having only a maximum limit but no minimum should not be used unless justified by specific
technical effect.
5.9 Nitrogen—It is recommended that nitrogen limits having only a maximum limit but no minimum should not be used unless
justified by specific technical effect.
5.10 Copper—It is recommended that copper limits having only a maximum limit but no minimum should not be used unless
justified by specific technical effect.
A959 − 19
5.11 Columbium and Tantalum—Except for special applications requiring positive identification of tantalum, it is recommended
that prior listings of these two elements together be limited to listing only columbium. The words “columbium” and “niobium”
refer to the same element.
6. Harmonized Standard Grade Stainless Steel Compositions
6.1 The harmonized composition limits are shown in Table 1, grouped by metallurgical classification, that is, austenitic,
austenitic-ferritic, and so forth. Within those groups, grades are listed by UNS designation, in numerical order.
6.2 Unless adopted by the appropriate product subcommittee in a product standard, the compositions described in this guide
shall not be used for specifying an ASTM product.
7. Keywords
7.1 austenitic stainless steels; austenitic-ferritic or ferritic-austenitic stainless steels; duplex stainless steels; ferritic stainless
steels; harmonized stainless steel compositions; martensitic stainless steels; precipitation hardening stainless steels; standard
stainless steel grade compositions
A959 − 19
A
TABLE 1 Chemical Composition Limits, %
UNS
C
Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickle Molybdenum Nitrogen Copper Other Elements
B
Designation
Austenitic Grades
D
S16800 16-8-2H 0.05–0.10 2.00 0.045 0.030 1.00 14.5–16.5 7.5–9.5 1.50–2.00 . . . . . . . . .
S20100 201 0.15 5.5–7.5 0.060 0.030 1.00 16.0–18.0 3.5–5.5 . . . 0.25 . . . . . .
S20103 201L 0.03 5.5–7.5 0.045 0.030 1.00 16.0–18.0 3.5–5.5 . . . 0.25 . . . . . .
D
S20153 201LN 0.03 6.4–7.5 0.045 0.015 1.00 16.0–17.5 4.0–5.0 . . . 0.10–0.25 1.00 . . .
S20161 . . . 0.15 4.0–6.0 0.045 0.030 3.0–4.0 15.0–18.0 4.0–6.0 . . . 0.08–0.20 . . . . . .
S20162 . . . 0.15 4.0–8.0 0.040 0.040 2.5–4.5 16.5–21.0 6.0–10.0 0.50–2.50 0.05–0.25 . . . . . .
S20200 202 0.15 7.5–10.0 0.060 0.030 1.00 17.0–19.0 4.0–6.0 . . . 0.25 . . . . . .
E
S20300 XM-1 0.08 5.0–6.5 0.045 0.18–0.35 1.00 16.0–18.0 5.0–6.5 . . . . . . 1.75–2.2 . . .
S20400 . . . 0.030 7.0–9.0 0.045 0.030 1.00 15.0–17.0 1.50–3.00 . . . 0.15–0.30 . . . . . .
S20430 . . . 0.15 6.5–9.0 0.060 0.030 1.00 15.5–17.5 1.50–3.50 . . . 0.05–0.25 2.0–4.0 . . .
S20431 . . . 0.12 5.0–7.0 0.045 0.030 1.00 17.0–18.0 2.0–4.0 . . . 0.10–0.25 1.50–3.50 . . .
S20432 . . . 0.08 3.0–5.0 0.045 0.030 1.00 17.0–18.0 4.0–6.0 . . . 0.05–0.20 2.00–3.00 . . .
S20433 . . . 0.08 5.5–7.5 0.045 0.030 1.00 17.0–18.0 3.5–5.5 . . . 0.10–0.25 1.50–3.50 . . .
S20500 205 0.12–0.25 14.0–15.0 0.060 0.030 1.00 16.5–18.0 1.00–1.75 . . . 0.32–0.40 . . . . . .
E H
S20910 XM-19 0.06 4.0–6.0 0.045 0.030 1.00 20.5–23.5 11.5–13.5 1.50–3.00 0.20–0.40 . . . Nb 0.10–0.30,
V 0.10–0.30
E
S21400 XM-31 0.12 14.0–16.0 0.045 0.030 0.30–1.00 17.0–18.5 1.00 . . . 0.35 min . . . . . .
E
S21460 XM-14 0.12 14.0–16.0 0.060 0.030 1.00 17.0–19.0 5.0–6.0 . . . 0.35–0.50 . . . . . .
S21500 . . . 0.06–0.15 5.5–7.0 0.045 0.030 0.2–1.0 14.0–16.0 9.0–11.0 0.80–1.20 . . . . . . Nb 0.75–1.25,
V 0.15–0.40,
B 0.003–0.009
E
S21600 XM-17 0.08 7.5–9.0 0.045 0.030 1.00 17.5–20.5 5.0–7.0 2.00–3.00 0.25–0.50 . . . . . .
E
S21603 XM-18 0.03 7.5–9.0 0.045 0.030 1.00 17.5–20.5 5.0–7.0 2.00–3.00 0.25–0.50 . . . . . .
S21640 . . . 0.08 3.5–6.5 0.060 0.030 1.00 17.5–19.5 4.0–6.5 0.50–2.00 0.08–0.30 . . . Nb 0.10–1.00
S21800 . . . 0.10 7.0–9.0 0.060 0.030 3.5–4.5 16.0–18.0 8.0–9.0 . . . 0.08–0.18 . . . . . .
E
S21900 XM-10 0.08 8.0–10.0 0.045 0.030 1.00 19.0–21.5 5.5–7.5 . . . 0.15–0.40 . . . . . .
E
S21904 XM-11 0.04 8.0–10.0 0.045 0.030 1.00 19.0–21.5 5.5–7.5 . . . 0.15–0.40 . . . . . .
E
S24000 XM-29 0.08 11.5–14.5 0.060 0.030 1.00 17.0–19.0 2.3–3.7 . . . 0.20–0.40 . . . . . .
E
S24100 XM-28 0.15 11.0–14.0 0.045 0.030 1.00 16.5–19.0 0.50–2.50 . . . 0.20–0.45 . . . . . .
S28200 . . . 0.15 17.0–19.0 0.045 0.030 1.00 17.0–19.0 . . . 0.75–1.25 0.40–0.60 0.75–1.25 . . .
S30100 301 0.15 2.00 0.045 0.030 1.00 16.0–18.0 6.0–8.0 . . . 0.10 . . . . . .
D
S30103 301L 0.030 2.00 0.045 0.030 1.00 16.0–18.0 5.0–8.0 . . . 0.20 . . . . . .
S30116 301Si 0.15 2.00 0.045 0.030 1.00–1.35 16.0–18.0 6.0–8.0 1.00 0.20 . . . . . .
D
S30153 301LN 0.030 2.00 0.045 0.030 1.00 16.0–18.0 5.0–8.0 . . . 0.07–0.20 . . . . . .
S30200 302 0.15 2.00 0.045 0.030 1.00 17.0–19.0 8.0–10.0 . . . 0.10 . . . . . .
S30215 302B 0.15 2.00 0.045 0.030 2.00–3.00 17.0–19.0 8.0–10.0 . . . 0.10 . . . . . .
S30300 303 0.15 2.00 0.20 0.15 min 1.00 17.0–19.0 8.0–10.0 . . . . . . . . . . . .
E
S30310 XM-15 0.15 2.5–4.5 0.20 0.25 min 1.00 17.0–19.0 7.0–9.0 . . . . . . . . . . . .
S30323 303Se 0.15 2.00 0.20 0.06 1.00 17.0–19.0 8.0–10.0 . . . . . . . . . Se 0.15 min
E
S30345 XM-2 0.15 2.00 0.05 0.11–0.16 1.00 17.0–19.0 8.0–10.0 0.40–0.60 . . . . . . Al 0.60–1.00
S30400 304 0.07 2.00 0.045 0.030 1.00 17.5–19.5 8.0–11.0 . . . . . . . . . . . .
S30403 304L 0.030 2.00 0.045 0.030 1.00 17.5–19.5 8.0–12.0 . . . . . . . . . . . .
S30409 304H 0.04–0.10 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . . . . . . . . . .
S30415 . . . 0.04–0.06 0.80 0.045 0.030 1.00–2.00 18.0–19.0 9.0–10.0 . . . 0.12–0.18 . . . Ce 0.03–0.08
S30430 . . . 0.03 2.00 0.045 0.030 1.00 17.0–19.0 8.0–10.0 . . . . . . 3.0–4.0 . . .
S30432 . . . 0.07–0.13 0.50 0.045 0.030 0.30 17.0–19.0 7.5–10.5 . . . 0.05–0.12 2.5–3.5 Nb 0.20–0.60,
Al 0.003–0.030,
B 0.001–0.010
G
S30434 . . . 0.07–0.14 2.00 0.040 0.010 1.00 17.5–19.5 9.0–12.0 . . . . . . 2.50–3.50 Nb 0.10–0.40 ,
G
Ti 0.10–0.25 ,
B 0.001–0.004
S30435 . . . 0.08 2.00 0.045 0.030 1.00 16.0–18.0 7.0–9.0 . . . . . . 1.50–3.00 . . .
S30441 . . . 0.08 2.00 0.045 0.030 1.0–2.0 17.5–19.5 8.0–10.5 . . . 0.10 1.5–2.5 Nb 0.1–0.5,
W 0.2–0.8
S30451 304N 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.10–0.16 . . . . . .
E
S30452 XM-21 0.08 2.00 0.045 0.030 1.00 18.0–20.0 8.0–10.0 . . . 0.16–0.30 . . . . . .

A959 − 19
TABLE 1 Continued
UNS
C
Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickle Molybdenum Nitrogen Copper Other Elements
B
Designation
S30453 304LN 0.030 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.10–0.16 . . . . . .
D
S30454 304LHN 0.03 2.00 0.045 0.030 1.00 18.0–20.0 8.0–11.0 . . . 0.16–0.30 . . . . . .
S30500 305 0.12 2.00 0.045 0.030 1.00 17.0–19.0 11.0–13.0 . . . . . . . . . . . .
S30530 . . . 0.08 2.00 0.045 0.030 0.50–2.50 17.0–20.5 8.5–11.5 0.75–1.50 . . . 0.75–3.50 . . .
S30600 . . . 0.018 2.00 0.020 0.020 3.7–4.3 17.0–18.5 14.0–15.5 0.20 . . . 0.50 . . .
S30601 . . . 0.015 0.50–0.80 0.030 0.013 5.0–5.6 17.0–18.0 17.0–18.0 0.20 0.05 0.35 . . .
S30615 . . . 0.16–0.24 2.00 0.030 0.030 3.2–4.0 17.0–19.5 13.5–16.0 . . . . . . . . . Al 0.80–1.50
S30800 308 0.08 2.00 0.045 0.030 1.00 19.0–21.0 10.0–12.0 . . . . . . . . . . . .
S30815 . . . 0.05–0.10 0.80 0.040 0.030 1.40–2.00 20.0–22.0 10.0–12.0 . . . 0.14–0.20 . . . Ce 0.03–0.08
S30900 309 0.20 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
S30908 309S 0.08 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
D
S30909 309H 0.04–0.10 2.00 0.045 0.030 1.00 22.0–24.0 12.0–15.0 . . . . . . . . . . . .
D
S30925 309LMoN 0.025 2.00 0.040 0.030 0.70 23.0–26.0 13.0–16.0 0.5–1.2 0.25–0.40 . . . . . .
D
S30940 309Nb 0.08 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10xC min, 1.10 max
D
S30940 309Nb 0.08 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10×C min, 1.10 max
D
S30941 309HNb 0.04–0.10 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10xC min, 1.10 max
D
S30941 309HNb 0.04–0.10 2.00 0.045 0.030 1.00 22.0–24.0 12.0–16.0 . . . . . . . . . Nb 10×C min, 1.10 max
S30942 . . . 0.03–0.10 2.00 0.040 0.030 1.00 21.0–23.0 14.5–16.5 0.10–0.20 . . . . . . Nb 0.50–0.80,
B 0.001–0.005
D
S31000 310 0.25 2.00 0.045 0.030 1.50 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
S31002 . . . 0.015 2.00 0.020 0.015 0.15 24.0–26.0 19.0–22.0 0.10 0.10 . . . . . .
S31008 310S 0.08 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
D
S31009 310H 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . . . .
D
S31025 310MoNbN 0.10 1.50 0.030 0.030 1.00 19.5–23.0 23.0–26.0 1.0–2.0 0.10–0.25 . . . Nb 0.10–0.40,
Ti 0.20,
B 0.002–0.010
S31035 . . . 0.04–0.10 0.60 0.025 0.015 0.40 21.5–23.5 23.5–26.5 . . . 0.20–0.30 2.5–3.5 Nb 0.40–0.60,
W 3.0–4.0,
Co 1.0–2.0,
B 0.002–0.008
D
S31040 310Nb 0.08 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10xC min, 1.10 max
D
S31040 310Nb 0.08 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10×C min, 1.10 max
D
S31041 310HNb 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10xC 1.10
D
S31041 310HNb 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . . . . . . . Nb 10×C 1.10
D
S31042 310HNbN 0.04–0.10 2.00 0.045 0.030 1.00 24.0–26.0 19.0–22.0 . . . 0.15–0.35 . . . Nb 0.20–0.60
D
S31050 310MoLN 0.030 2.00 0.030 0.015 0.40 24.0–26.0 21.0–23.0 2.00–3.00 0.10–0.16 . . .
S31060 . . . 0.05–0.10 1.00 0.040 0.030 0.50 22.0–24.0 10.0–12.5 . . . 0.18–0.25 . . . (Ce + La) 0.025 min, 0.070 max;
B 0.001–0.010
S31060 . . . 0.05–0.10 1.00 0.040 0.030 0.50 22.0–24.0 10.0–12.5 . . . 0.18–0.25 . . . (Ce+La) 0.025 min, 0.070 max;
B 0.001–0.010
S31254 . . . 0.020 1.00 0.030 0.010 0.80 19.5–20.5 17.5–18.5 6.0–6.5 0.18–0.22 0.50–1.00 . . .
S31266 . . . 0.030 2.0–4.0 0.035 0.020 1.00 23.0–25.0 21.0–24.0 5.2–6.2 0.35–0.60 1.00–2.50 W 1.50–2.50
S31272 . . . 0.08–0.12 1.50–2.00 0.030 0.015 0.30–0.70 14.0–16.0 14.0–16.0 1.00–1.40 . . . . . . Ti 0.30–0.60,
B 0.004–0.008
S31277 . . . 0.020 3.00 0.030 0.010 0.50 20.5–23.0 26.0–28.0 6.5–8.0 0.30–0.40 0.50–1.50 . . .
D
S31400 314 0.25 2.00 0.045 0.030 1.50–3.00 23.0–26.0 19.0–22.0 . . . . . . . . . . . .
S31600 316 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
S31603 316L 0.030 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
S31609 316H 0.04–0.10 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 . . . . . . . . .
D
S31635 316Ti 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Ti 5x(C+N) min, 0.70 max
D
S31635 316Ti 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Ti 5×(C+N) min, 0.70 max
D
S31640 316Nb 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Nb 10xC min, 1.10 max
D
S31640 316Nb 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–14.0 2.00–3.00 0.10 . . . Nb 10×C min, 1.10 max
S31651 316N 0.08 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.10–0.16 . . . . . .
S31653 316LN 0.030 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.10–0.16 . . . . . .
D
S31654 316LHN 0.03 2.00 0.045 0.030 1.00 16.0–18.0 10.0–13.0 2.00–3.00 0.16–0.30 . . . . . .
S31700 317 0.08 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0–4.0 . . . . . . . . .

A959 − 19
TABLE 1 Continued
UNS
C
Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickle Molybdenum Nitrogen Copper Other Elements
B
Designation
D
S31703 317L 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–15.0 3.0–4.0 . . . . . . . . .
S31725 317LM 0.030 2.00 0.045 0.030 1.00 18.0–20.0 13.5–17.5 4.0–5.0 0.20 . . . . . .
S31726 317LMN 0.030 2.00 0.045 0.030 1.00 17.0–20.0 13.5–17.5 4.0–5.0 0.10–0.20 . . . . . .
S31727 . . . 0.030 1.00 0.030 0.030 1.00 17.5–19.0 14.5–16.5 3.8–4.5 0.15–0.21 2.8–4.0 . . .
D
S31753 317LN 0.030 2.00 0.045 0.030 1.00 18.0–20.0 11.0–14.0 3.0–4.0 0.10–0.22 . . . . . .
S32050 . . . 0.030 1.50 0.035 0.020 1.00 22.0–24.0 20.0–23.0 6.0–6.8 0.21–0.32 0.40 . . .
S32053 . . . 0.030 1.00 0.030 0.010 1.00 22.0–24.0 24.0–26.0 5.0–6.0 0.17–0.22 . . . . . .
S32100 321 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . 0.10 . . . Ti 5x(C+N) min, 0.70 max
S32100 321 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . 0.10 . . . Ti 5×(C+N) min, 0.70 max
S32109 321H 0.04–0.10 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . 0.10 . . . Ti 4x(C+N) min, 0.70 max
S32109 321H 0.04–0.10 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . 0.10 . . . Ti 4×(C+N) min, 0.70 max
S32615 . . . 0.07 2.00 0.045 0.030 4.8–6.0 16.5–19.5 19.0–22.0 0.30–1.50 . . . 1.50–2.50 . . .
S32654 . . . 0.020 2.0–4.0 0.030 0.005 0.50 24.0–25.0 21.0–23.0 7.0–8.0 0.45–0.55 0.30–0.60 . . .
S33228 . . . 0.04–0.08 1.00 0.020 0.015 0.30 26.0–28.0 31.0–33.0 . . . . . . . . . Nb 0.60–1.00,
Al 0.025,
Ce 0.05–0.10
D
S33400 334 0.08 1.00 0.030 0.015 1.00 18.0–20.0 19.0–21.0 . . . . . . . . . Al 0.15–0.60,
Ti 0.15–0.60
S33425 . . . 0.08 1.50 0.045 0.020 1.00 21.0–23.0 20.0–23.0 2.00–3.00 . . . . . . Al 0.15–0.60,
Ti 0.15–0.60
S33550 . . . 0.04–0.10 1.50 0.040 0.030 1.00 25.0–28.0 16.5–20.0 . . . 0.18–0.25 . . . Nb 0.05–0.15,
(La + Ce) 0.025–0.070
S33550 . . . 0.04–0.10 1.50 0.040 0.030 1.00 25.0–28.0 16.5–20.0 . . . 0.18–0.25 . . . Nb 0.05–0.15,
(La+Ce) 0.025–0.070
S34565 . . . 0.030 5.0–7.0 0.030 0.010 1.00 23.0–25.0 16.0–18.0 4.0–5.0 0.40–0.60 . . . Nb 0.10
S34700 347 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . . . . . . . Nb 10xC min, 1.10 max
S34700 347 0.08 2.00 0.045 0.030 1.00 17.0–19.0 9.0–12.0 . . . . . . . . . Nb 10×C min, 1.10 max
S34705 . . . 0.05 2.00 0.040 0.030 1.00 17.0–20.0 8.00–11.0 . . . 0.10–0.25 . . . Nb 0.25–0.50,
V 0.20–0.50,
W 1.50–2.60
S34709 347H 0.04–0.10 2.00 0.045 0.030 1.00 17.0–1
...