ASTM A890/A890M-10

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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.
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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
...