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 non-conformance with the standard.

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ASTM A995/A995M-12 - Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
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REDLINE ASTM A995/A995M-12 - Standard Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A995/A995M −12
StandardSpecification 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. 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* E165 Practice for Liquid Penetrant Examination for General
Industry
1.1 This specification covers austenitic-ferritic (duplex)
E562 Test Method for Determining Volume Fraction by
stainless steel castings for valves, flanges, fittings, and other
Systematic Manual Point Count
pressure-containing parts.
3. Terminology
1.2 The duplex stainless steels offer a combination of
enhanced mechanical properties and corrosion resistance when
3.1 Definitions of Terms Specific to This Standard:
properly balanced in composition and properly heat treated.
3.1.1 duplex stainless steel—an iron-chromium-nickel-
Ferrite levels are not specified, but these grades will develop a
molybdenum alloy which when properly heat treated consists
range of approximately 30 to 60 % ferrite with the balance
of approximately 30 to 60 % ferrite with the balance austenite.
austenite. It is the responsibility of the purchaser to determine
4. General Conditions for Delivery
which grade shall be furnished depending on design and
service conditions, mechanical properties, and corrosion-
4.1 Material furnished to this specification shall conform to
resistant characteristics.
the applicable requirements of Specification A703/A703M,
including the supplementary requirements that are indicated on
NOTE 1—Because of the possibility of precipitation of embrittling
phases, the grades included in this specification are not recommended for the purchaser order. Failure to comply with the general
service at temperatures above 600°F [315°C].
requirements of Specification A703/A703M constitutes non-
conformance with this specification. In case of conflict be-
1.3 The values stated in either SI units or inch-pound units
tween the requirements of the specification and Specification
are to be regarded separately as standard. The values stated in
A703/A703M, this specification shall prevail.
each system may not be exact equivalents; therefore, each
system shall be used independently of the other. Combining
5. Ordering Information
values from the two systems may result in non-conformance
5.1 It is the responsibility of the purchaser to specify all
with the standard.
requirements that are necessary for material ordered under this
specification. Such requirements may included, but are not
2. Referenced Documents
limited to, the following:
2
2.1 ASTM Standards:
5.1.1 A description of the casting by pattern number or
A488/A488M Practice for Steel Castings, Welding, Qualifi-
drawing (dimensional tolerances shall be included on the
cations of Procedures and Personnel
casting drawing),
A703/A703M Specification for Steel Castings, General
5.1.2 Quantity (weight and number of castings),
Requirements, for Pressure-Containing Parts
5.1.3 Specification designation and date of issue,
E125 Reference Photographs for Magnetic Particle Indica-
5.1.4 Grade of steel,
tions on Ferrous Castings
5.1.5 Supplementary requirements including acceptance
criteria, and
5.1.6 Additional requirements.
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee 6. Process
A01.18 on Castings.
6.1 The steel shall be made by the electric furnace process
Current edition approved March 1, 2012. Published April 2012. Originally
approved in 1998. Last previous edition approved in 2009 as A995/A995M – 09. with or without separate refining.
DOI: 10.1520/A0995_A0995M-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Heat Treatment
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 All castings shall be heat treated in accordance with
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Table 1.
*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

---------------------- Page: 1 ----------------------
A995/A995M − 12
TABLE 1 Heat Treatment Requirements
10. Quality
Grade Heat Treatment
10.1 When additional inspection is desired, Supplementary
1B Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat
Requirements S5, S6, and S10 may be ordered.
casting uniformly to temperature, quench in water or rapid cool by
other means.
1
...

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–09 Designation: A995/A995M – 12
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. 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 non-conformance with the standard.
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 Practice for Liquid Penetrant Examination for General Industry
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 duplex stainless steel—an iron-chromium-nickel-molybdenum alloy which 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 the specification and Specification A703/A703M, this specification shall prevail.
5. Ordering Information
5.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this
specification. Such requirements may included, but are not limited to, the following:
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.18
on Castings.
Current edition approved May 1, 2009. Published June 2009. Originally approved in 1998. Last previous edition approved in 2007 as A995/A995M–98 (2007). DOI:
10.1520/A0995_A0995M-09.
Current edition approved March 1, 2012. Published April 2012. Originally approved in 1998. Last previous edition approved in 2009 as A995/A995M – 09. DOI:
10.1520/A0995_A0995M-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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

---------------------- Page: 1 ----------------------
A995/A995M – 12
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
casting uniformly to temperature, quench in water or rapid cool by
other means.
3A Heat to 1950°F [1070°C] minim
...

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–09 Designation: A995/A995M – 12
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. 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 non-conformance with the standard.
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 Practice for Liquid Penetrant Examination for General Industry
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 duplex stainless steel—an iron-chromium-nickel-molybdenum alloy which 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 the specification and Specification A703/A703M, this specification shall prevail.
5. Ordering Information
5.1 It is the responsibility of the purchaser to specify all requirements that are necessary for material ordered under this
specification. Such requirements may included, but are not limited to, the following:
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.18
on Castings.
Current edition approved May 1, 2009. Published June 2009. Originally approved in 1998. Last previous edition approved in 2007 as A995/A995M–98 (2007). DOI:
10.1520/A0995_A0995M-09.
Current edition approved March 1, 2012. Published April 2012. Originally approved in 1998. Last previous edition approved in 2009 as A995/A995M – 09. DOI:
10.1520/A0995_A0995M-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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

---------------------- Page: 1 ----------------------
A995/A995M – 12
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
casting uniformly to temperature, quench in water or rapid cool by
other means.
3A Heat to 1950°F [1070°C] minim
...

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