ASTM A890/A890M-10
(Specification)Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application
Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application
ABSTRACT
This specification covers castings, iron-chromium-nickel-molybdenum corrosion-resistant, duplex(austenitic/ferritic) for general application. Castings shall be heat treated in accordance with the required procedure and heat-treat temperature. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet the required mechanical properties. The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen. Castings shall be marked for material identification with the specification designation and grade.
SCOPE
1.1 This specification covers a group of cast duplex stainless steels (austenitic/ferritic).
1.2 The duplex stainless steel alloys 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 alloys will develop a range of approximately 30 to 60 % ferrite with the balance austenite.
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.
1.3.1 Within the text, the SI units are shown in brackets.
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Designation: A890/A890M – 10
Standard Specification for
Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-
Resistant, Duplex (Austenitic/Ferritic) for General
1
Application
This standard is issued under the fixed designationA890/A890M; 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* E1245 Practice for Determining the Inclusion or Second-
Phase Constituent Content of Metals by Automatic Image
1.1 Thisspecificationcoversagroupofcastduplexstainless
Analysis
steels (austenitic/ferritic).
1.2 The duplex stainless steel alloys offer a combination of
3. Ordering Information
enhanced mechanical properties and corrosion resistance when
3.1 Orders for material to this specification shall include the
properly balanced in composition and properly heat treated.
following, as required, to describe the material adequately:
Ferrite levels are not specified, but these alloys will develop a
3.1.1 Description of casting by pattern or drawing number
range of approximately 30 to 60 % ferrite with the balance
(dimensional tolerance shall be included on the casting draw-
austenite.
ing),
1.3 The values stated in either SI units or inch-pound units
3.1.2 Specification designation and grade including year of
are to be regarded separately as standard. The values stated in
issue,
each system may not be exact equivalents; therefore, each
3.1.3 Options in the specification (See 9.1), and
system shall be used independently of the other. Combining
3.1.4 Supplementary requirements desired, including the
values from the two systems may result in non-conformance
standards of acceptance.
with the standard.
1.3.1 Within the text, the SI units are shown in brackets.
4. Process
4.1 The steel shall be made by the electric furnace process
2. Referenced Documents
2 with or without separate refining such as argon-oxygen-
2.1 ASTM Standards:
decarburization (AOD).
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
5. Heat Treatment
A732/A732M Specification for Castings, Investment, Car-
5.1 Castings shall be heat treated in accordance with the
bon and Low Alloy Steel for General Application, and
requirements in Table 1.
Cobalt Alloy for High Strength at Elevated Temperatures
A781/A781M Specification for Castings, Steel and Alloy,
NOTE 1—Proper heat treatment of these alloys is usually necessary to
Common Requirements, for General Industrial Use enhance corrosion resistance and in some cases to meet mechanical
properties. Minimum heat-treat temperatures are specified; however, it is
E29 Practice for Using Significant Digits in Test Data to
sometimes necessary to heat-treat at higher temperatures, hold for some
Determine Conformance with Specifications
minimum time at temperature and then rapidly cool the castings in order
E562 Test Method for Determining Volume Fraction by
to enhance the corrosion resistance and meet mechanical properties.
Systematic Manual Point Count
6. Chemical Composition
6.1 The steel shall conform to the requirements as to
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
chemical composition prescribed in Table 2.
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
7. General Requirements
Current edition approved April 1, 2010. Published May 2010. Originally
7.1 Material furnished to this specification shall conform to
approved in 1988. Last previous edition approved in 2007 as A890/A890M – 99
(2007). DOI: 10.1520/A0890_A0890M-10.
the requirements of SpecificationA781/A781M, including any
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
supplementary requirements that are indicated in the purchase
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
order. Failure to comply with the general requirements of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Specification A781/A781M constitutes nonconformance with
*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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A890/A890M – 10
TABLE 1 Heat Treatment Requirements
8.2 Weld repairs shall be subject to the same quality
standards as are used to inspect the castings.
Grade Heat Treatment
8.3 When post weld/heat treatment is believed necessary for
1B, 1C Heat to 1900°F [1040°C] minimum, hold for sufficient time to
adequate corrosion resistance or impact resistance, Sup-
heat casting uniformly to
...
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:A890/A890M–99 (Reapproved 2007) Designation: A890/A890M – 10
Standard Specification for
Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-
Resistant, Duplex (Austenitic/Ferritic) for General
1
Application
This standard is issued under the fixed designationA890/A890M; 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 a group of cast duplex stainless steels (austenitic/ferritic).
1.2 The duplex stainless steel alloys 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 alloys will develop a range
of approximately 30 to 60 % ferrite with the balance austenite.
1.3 The values stated in either inch-poundSI units or metric (SI) inch-pound units are to be regarded separately as standard.
Within the text the metric (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.
1.3.1 Within the text, the SI units are shown in brackets.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A732/A732M Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy
for High Strength at Elevated Temperatures
A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
E1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis
3. Ordering Information
3.1 Orders for material to this specification shall include the following, as required, to describe the material adequately:
3.1.1 Description of casting by pattern or drawing number (dimensional tolerance shall be included on the casting drawing),
3.1.2 Specification designation and grade including year of issue,
3.1.3 Options in the specification (See 9.1), and
3.1.4 Supplementary requirements desired, including the standards of acceptance.
4. Process
4.1 The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen-
decarburization (AOD).
5. Heat Treatment
5.1 Castings shall be heat treated in accordance with the requirements in Table 1.
NOTE 1—Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties.
Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at
temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet mechanical properties.
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.April 1, 2007.2010. Published November 2007.May 2010. Originally approved in 1988. Last previous edition approved in 20032007 as
A890/A890M – 99 (2003).(2007). DOI: 10.1520/A0890_A0890M-99R07.10.1520/A0890_A0890M-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM 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 ----------------------
A890/A890M – 10
TABLE 1 Heat Treatment Requirements
Grade Heat Treatment
1A, 1B, 1C 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.
1B, 1C Heat to 1900°F [1040°C] minimum, hold for sufficient time to
heat casting uniformly to temperature, quenc
...
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