ASTM A890/A890M-18a
(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. 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.
1.3.1 Within the text, the SI units are shown in brackets.
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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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: A890/A890M −18a
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* 2. Referenced Documents
2
2.1 ASTM Standards:
1.1 Thisspecificationcoversagroupofcastduplexstainless
A781/A781M Specification for Castings, Steel and Alloy,
steels (austenitic/ferritic).
Common Requirements, for General Industrial Use
1.2 The duplex stainless steel alloys offer a combination of
A957/A957M Specification for Investment Castings, Steel
enhanced mechanical properties and corrosion resistance when
and Alloy, Common Requirements, for General Industrial
properly balanced in composition and properly heat treated.
Use
Ferrite levels are not specified, but these alloys will develop a
E562 Test 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 E1245 Practice for Determining the Inclusion or Second-
which grade shall be furnished depending on design and Phase Constituent Content of Metals byAutomatic Image
service conditions, mechanical properties, and corrosion- Analysis
resistant characteristics.
3. Ordering Information
NOTE 1—Because of the possibility of precipitation of embrittling
3.1 Orders for material to this specification shall include the
phases, the grades included in this specification are not recommended for
following, as required, to describe the material adequately:
service at temperatures above 600 °F [315 °C].
3.1.1 Description of casting by pattern or drawing number
1.3 The values stated in either SI units or inch-pound units
(dimensional tolerance shall be included on the casting
are to be regarded separately as standard. The values stated in
drawing),
each system may not be exact equivalents; therefore, each
3.1.2 Specification designation and grade, including year of
system shall be used independently of the other. Combining
issue,
values from the two systems may result in nonconformance
3.1.3 Options in the specification (see 9.1), and
with the standard.
3.1.4 Supplementary requirements desired, including the
standards of acceptance.
1.3.1 Within the text, the SI units are shown in brackets.
1.4 This international standard was developed in accor-
4. Process
dance with internationally recognized principles on standard-
4.1 The steel shall be made by the electric furnace process,
ization established in the Decision on Principles for the
with or without separate refining such as argon-oxygen-
Development of International Standards, Guides and Recom-
decarburization (AOD).
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
5. Heat Treatment
5.1 Castings shall be heat treated in accordance with the
requirements in Table 1.
NOTE 2—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
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
2
A01.18 on Castings. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2018. Published October 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1988. Last previous edition approved in 2018 as A890/A890M – 18. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0890_A0890M-18A. 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 − 18a
TABLE 1 Heat Treatment Requirements
this specification. In case of conflict between the requirements
Grade Heat Treatment of this specification and Specification A781/A781M, this
specification shall prevail.
1B, 1C Heat to 1900 °F [1040 °C] minimum, hold for sufficient time to
7.2 Steel investment castings furnished to this specification
heat casting uniformly to temperature, quench
...
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 − 18 A890/A890M − 18a
Standard Specification for
Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-
Resistant, Duplex (Austenitic/Ferritic) for General
1
Application
This standard is issued under the fixed designation A890/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. 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.
1.3.1 Within the text, the SI units are shown in brackets.
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:
A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
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).
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 May 1, 2018Sept. 1, 2018. Published May 2018October 2018. Originally approved in 1988. Last previous edition approved in 20132018 as
A890/A890M – 13.A890/A890M – 18. DOI: 10.1520/A0890_A0890M-18.10.1520/A0890_A0890M-18A.
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
---------------------- Page: 1 ----------------------
A890/A890M − 18a
5. Heat Treatment
5.1 Castings shall be heat treated in accordance with the requirements in Table 1.
NOTE 2—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 resis
...
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