ASTM A890/A890M-12
(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 600ºF [315ºC].
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 −12
StandardSpecification 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* A781/A781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use
1.1 Thisspecificationcoversagroupofcastduplexstainless
E29 Practice for Using Significant Digits in Test Data to
steels (austenitic/ferritic).
Determine Conformance with Specifications
1.2 The duplex stainless steel alloys offer a combination of
E562 Test Method for Determining Volume Fraction by
enhanced mechanical properties and corrosion resistance when
Systematic Manual Point Count
properly balanced in composition and properly heat treated.
E1245 Practice for Determining the Inclusion or Second-
Ferrite levels are not specified, but these alloys will develop a
Phase Constituent Content of Metals byAutomatic Image
range of approximately 30 to 60 % ferrite with the balance
Analysis
austenite. It is the responsibility of the purchaser to determine
which grade shall be furnished depending on design and
3. Ordering Information
service conditions, mechanical properties, and corrosion-
3.1 Orders for material to this specification shall include the
resistant characteristics.
following, as required, to describe the material adequately:
NOTE 1—Because of the possibility of precipitation of embrittling
3.1.1 Description of casting by pattern or drawing number
phases, the grades included in this specification are not recommended for
(dimensional tolerance shall be included on the casting
service at temperatures above 600ºF [315ºC].
drawing),
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
2. Referenced Documents
4.1 The steel shall be made by the electric furnace process
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-
bon and Low Alloy Steel for General Application, and
5.1 Castings shall be heat treated in accordance with the
Cobalt Alloy for High Strength at Elevated Temperatures
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
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
properties. Minimum heat-treat temperatures are specified; however, it is
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee
sometimes necessary to heat-treat at higher temperatures, hold for some
A01.18 on Castings.
minimum time at temperature and then rapidly cool the castings in order
Current edition approved March 1, 2012. Published April 2012. Originally
to enhance the corrosion resistance and meet mechanical properties.
approved in 1988. Last previous edition approved in 2010 as A890/A890M – 10.
DOI: 10.1520/A0890_A0890M-12.
2
6. Chemical Composition
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
6.1 The steel shall conform to the requirements as to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. chemical composition prescribed in Table 2.
*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 − 12
TABLE 1 Heat Treatment Requirements
of this specification and Specification A781/A781M, this
Grade Heat Treatment specification shall prevail.
8. Repair by Welding
1B, 1C Heat to 1900°F [1040°C] minimum, hold for sufficient time to
heat casting uniformly to temperature, quench in water or rapid
8.1 The composition of the d
...
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–10 Designation: A890/A890M – 12
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).
1.2The 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.
1.2 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 600ºF [315ºC].
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.
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.
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 April 1, 2010. Published May 2010. Originally approved in 1988. Last previous edition approved in 2007 as A890/A890M–99 (2007). DOI:
10.1520/A0890_A0890M-10.
Current edition approved March 1, 2012. Published April 2012. Originally approved in 1988. Last previous edition approved in 2010 as A890/A890M – 10. DOI:
10.1520/A0890_A0890M-12.
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 – 12
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.
NOTE1—Proper 2—Proper heat treatment of these alloys is us
...
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