ASTM A995/A995M-20
(Specification)Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
ABSTRACT
This specification covers austenitic-ferritic (duplex) stainless steel castings for valves, flanges, fittings, and other pressure-containing parts. The grades of steels covered here are: Grade 1B, Grade 2A, Grade 3A, Grade 4A, Grade 5A, and Grade 6A. The steel castings shall be heat-treated up to required temperature and shall undergo water quenching or rapid cooling by other means after heating. Heat and product analyses shall be performed wherein specimens shall conform to required chemical composition of carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen. All steels shall undergo tension test, and shall conform to the following mechanical requirements: tensile strength, yield strength, and elongation.
SCOPE
1.1 This specification covers austenitic-ferritic (duplex) stainless steel castings for valves, flanges, fittings, and other pressure-containing parts.
1.2 The duplex stainless steels offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not specified, but these grades will develop a range of approximately 30 to 60 % ferrite with the balance austenite. It is the responsibility of the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics.
Note 1: Because of the possibility of precipitation of embrittling phases, the grades included in this specification are not recommended for service at temperatures above 600 °F [315 °C].
1.3 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 nonconformance with the standard.
1.4 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.
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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: A995/A995M −20
Standard Specification for
Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for
1
Pressure-Containing Parts
This standard is issued under the fixed designationA995/A995M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* A488/A488MPractice for Steel Castings, Welding, Qualifi-
cations of Procedures and Personnel
1.1 This specification covers austenitic-ferritic (duplex)
A703/A703M Specification for Steel Castings, General
stainless steel castings for valves, flanges, fittings, and other
Requirements, for Pressure-Containing Parts
pressure-containing parts.
E125Reference Photographs for Magnetic Particle Indica-
1.2 The duplex stainless steels offer a combination of
tions on Ferrous Castings
enhancedmechanicalpropertiesandcorrosionresistancewhen
E165/E165MPractice for Liquid Penetrant Testing for Gen-
properly balanced in composition and properly heat treated.
eral Industry
Ferrite levels are not specified, but these grades will develop a
E562Test Method for Determining Volume Fraction by
range of approximately 30 to 60% ferrite with the balance
Systematic Manual Point Count
austenite. It is the responsibility of the purchaser to determine
G48Test Methods for Pitting and Crevice Corrosion Resis-
which grade shall be furnished depending on design and
tance of Stainless Steels and Related Alloys by Use of
service conditions, mechanical properties, and corrosion-
Ferric Chloride Solution
resistant characteristics.
3. Terminology
NOTE 1—Because of the possibility of precipitation of embrittling
phases, the grades included in this specification are not recommended for 3.1 Definitions of Terms Specific to This Standard:
service at temperatures above 600°F [315°C].
3.1.1 duplex stainless steel—an iron-chromium-nickel-
molybdenumalloythat,whenproperlyheattreated,consistsof
1.3 The values stated in either SI units or inch-pound units
approximately 30 to 60% ferrite with the balance austenite.
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
4. General Conditions for Delivery
system shall be used independently of the other. Combining
values from the two systems may result in nonconformance 4.1 Material furnished to this specification shall conform to
the applicable requirements of Specification A703/A703M,
with the standard.
includingthesupplementaryrequirementsthatareindicatedon
1.4 This international standard was developed in accor-
the purchaser order. Failure to comply with the general
dance with internationally recognized principles on standard-
requirements of Specification A703/A703M constitutes non-
ization established in the Decision on Principles for the
conformance with this specification. In case of conflict be-
Development of International Standards, Guides and Recom-
tween the requirements of this specification and Specification
mendations issued by the World Trade Organization Technical
A703/A703M, this specification shall prevail.
Barriers to Trade (TBT) Committee.
5. Ordering Information
2. Referenced Documents
5.1 It is the responsibility of the purchaser to specify all
2
2.1 ASTM Standards:
requirements that are necessary for material ordered under this
specification. Such requirements may include, but are not
limited to, the following:
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
5.1.1 A description of the casting by pattern number or
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
drawing (dimensional tolerances shall be included on the
A01.18 on Castings.
casting drawing),
Current edition approved May 1, 2020. Published May 2020. Originally
5.1.2 Quantity (weight and number of castings),
approved in 1998. Last previous edition approved in 2019 as A995/A995M–19.
DOI: 10.1520/A0995_A0995M-20.
5.1.3 Specification designation and date of issue,
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.1.4 Grade of steel,
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1.5 Supplementary requirements including acceptance
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. criteria, and
*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
1
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...
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: A995/A995M − 19 A995/A995M − 20
Standard Specification for
Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for
1
Pressure-Containing Parts
This standard is issued under the fixed designation A995/A995M; 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 specification covers austenitic-ferritic (duplex) stainless steel castings for valves, flanges, fittings, and other
pressure-containing parts.
1.2 The duplex stainless steels offer a combination of enhanced mechanical properties and corrosion resistance when properly
balanced in composition and properly heat treated. Ferrite levels are not specified, but these grades will develop a range of
approximately 30 to 60 % ferrite with the balance austenite. It is the responsibility of the purchaser to determine which grade shall
be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics.
NOTE 1—Because of the possibility of precipitation of embrittling phases, the grades included in this specification are not recommended for service
at temperatures above 600 °F [315 °C].
1.3 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 nonconformance with the standard.
1.4 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
2.1 ASTM Standards:
A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A703/A703M Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
E125 Reference Photographs for Magnetic Particle Indications on Ferrous Castings
E165/E165M Practice for Liquid Penetrant Testing for General Industry
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
G48 Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride
Solution
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 duplex stainless steel—an iron-chromium-nickel-molybdenum alloy that, when properly heat treated, consists of
approximately 30 to 60 % ferrite with the balance austenite.
4. General Conditions for Delivery
4.1 Material furnished to this specification shall conform to the applicable requirements of Specification A703/A703M,
including the supplementary requirements that are indicated on the purchaser order. Failure to comply with the general
requirements of Specification A703/A703M constitutes nonconformance with this specification. In case of conflict between the
requirements of this specification and Specification A703/A703M, this specification shall prevail.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.18
on Castings.
Current edition approved March 1, 2019May 1, 2020. Published March 2019May 2020. Originally approved in 1998. Last previous edition approved in 20182019 as
A995/A995M – 18a.A995/A995M – 19. DOI: 10.1520/A0995_A0995M-19.10.1520/A0995_A0995M-20.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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
1
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A995/A995M − 20
TABLE 1 Heat Treatment Requirements
Grade Heat Treatment
1B Heat to 1900 °F [1040 °C] minimum, hold for sufficient time to heat
casting uniformly to temperature, quench in water or rapid cool by
other means.
2A Heat to 2050 °F [1120 °C] minimum, hold for sufficient time to heat
...
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