ASTM A995/A995M-09
(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 non-conformance with the standard.
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Designation: A995/A995M – 09
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.
TABLE 1 Heat Treatment Requirements
1. Scope*
Grade Heat Treatment
1.1 This specification covers austenitic-ferritic (duplex)
1B Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat
stainless steel castings for valves, flanges, fittings, and other
casting uniformly to temperature, quench in water or rapid cool by
pressure-containing parts.
other means.
1.2 The duplex stainless steels offer a combination of
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
enhanced mechanical properties and corrosion resistance when
other means.
properly balanced in composition and properly heat treated.
3A Heat to 1950°F [1070°C] minimum, hold for sufficient time to heat
Ferrite levels are not specified, but these grades will develop a
casting uniformly to temperature, quench in water or rapid cool by
other means.
range of approximately 30 to 60 % ferrite with the balance
4A Heat to 2050°F [1120°C] minimum for sufficient time to heat casting
austenite. It is the responsibility of the purchaser to determine
uniformly to temperature and water quench, or the casting may be
which grade shall be furnished depending on design and furnace cooled to 1850°F [1010°C] minimum, hold for 15 min
minimum and then water quench. A rapid cool by other means may
service conditions, mechanical properties, and corrosion-
be employed in lieu of water quench.
resistant characteristics.
5A Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat
casting to temperature, furnace cool to 1910°F [1045°C] minimum,
NOTE 1—Because of the possibility of precipitation of embrittling
quench in water or rapid cool by other means.
phases, the grades included in this specification are not recommended for
6A Heat to 2010°F [1100°C] minimum, hold for sufficient time to heat
service at temperatures above 600°F [315°C].
casting uniformly to temperature, quench in water or cool rapidly by
other means.
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 E562 Test Method for Determining Volume Fraction by
values from the two systems may result in non-conformance Systematic Manual Point Count
with the standard.
3. Terminology
2. Referenced Documents
3.1 Definitions of Terms Specific to This Standard:
2
2.1 ASTM Standards:
3.1.1 duplex stainless steel—an iron-chromium-nickel-
A488/A488M Practice for Steel Castings, Welding, Quali- molybdenum alloy which when properly heat treated consists
fications of Procedures and Personnel
of approximately 30 to 60 % ferrite with the balance austenite.
A703/A703M Specification for Steel Castings, General Re-
4. General Conditions for Delivery
quirements, for Pressure-Containing Parts
E125 Reference Photographs for Magnetic Particle Indica- 4.1 Material furnished to this specification shall conform to
tions on Ferrous Castings the applicable requirements of Specification A703/A703M,
including the supplementary requirements that are indicated on
E165 PracticeforLiquidPenetrantExaminationforGeneral
Industry the purchaser order. Failure to comply with the general
requirements of Specification A703/A703M constitutes non-
conformance with this specification. In case of conflict be-
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
tween the requirements of the specification and Specification
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A703/A703M, this specification shall prevail.
A01.18 on Castings.
Current edition approved May 1, 2009. Published June 2009. Originally
5. Ordering Information
approved in 1998. Last previous edition approved in 2007 as A995/A995M – 98
(2007). DOI: 10.1520/A0995_A0995M-09.
5.1 It is the responsibility of the purchaser to specify all
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
requirements that are necessary for material ordered under this
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specification. Such requirements may included, but are not
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. limited to, th
...
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:A 995/A 995M–98 (Reapproved 2007) Designation: A995/A995M – 09
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 inch-poundSI units or SIinch-pound units are to be regarded separately as standard. Within the
text, the SI units are shown in brackets. The values stated in each system aremay not be exact equivalents; therefore, each system
mustshall be used independently of the other. Combining values from the two systems may result in non-conformance with the
specification. 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 A 703/A
703MA703/A703M, including the supplementary requirements that are indicated on the purchaser order. Failure to comply with
the general requirements of SpecificationA703/A703MA703/A703M constitutes nonconformance with this specification. In case
of conflict between the requirements of the specification and Specification A 703/A 703MA703/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 Nov. 1, 2007. Published December 2007. Originally approved in 1998. Last previous edition approved in 2003 as A 995–98 (2003).
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.
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 – 09
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
...
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–98 (Reapproved 2007) Designation: A 995/A 995M – 09
Standard Specification for
Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for
1
Pressure-Containing Parts
This standard is issued under the fixed designationA 995/A 995M; 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 inch-poundSI units or SIinch-pound units are to be regarded separately as standard. Within the
text, the SI units are shown in brackets. The values stated in each system aremay not be exact equivalents; therefore, each system
mustshall be used independently of the other. Combining values from the two systems may result in non-conformance with the
specification. standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A 488/A 488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A 703/A 703M Specification for Steel Castings, General Requirements, for Pressure-Containing Parts
E 125 Reference Photographs for Magnetic Particle Indications on Ferrous Castings
E 165 Test Method for Liquid Penetrant Examination
E 562 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 A 703/A 703M,
including the supplementary requirements that are indicated on the purchaser order. Failure to comply with the general
requirements of Specification A 703/A 703M constitutes nonconformance with this specification. In case of conflict between the
requirements of the specification and Specification A 703/A 703M, 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:
5.1.1 A description of the casting by pattern number or drawing (dimensional tolerances shall be included on the casting
drawing),
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 Nov. 1, 2007. Published December 2007. Originally approved in 1998. Last previous edition approved in 2003 as A995–98 (2003).
Current edition approved May 1, 2009. Published June 2009. Originally approved in 1998. Last previous edition approved in 2007 as A 995/A 995M – 98 (2007).
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 ----------------------
A 995/A 995M – 09
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.
...
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