ASTM A890/A890M-99(2007)
(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 inch-pound units or metric (SI) 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 are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A890/A890M – 99 (Reapproved 2007)
Standard Specification for
Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-
Resistant, Duplex (Austenitic/Ferritic) for General
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 inch-pound units or metric
3.1.2 Specification designation and grade including year of
(SI) units are to be regarded separately as standard. Within the
issue,
text the metric (SI) units are shown in brackets. The values
3.1.3 Options in the specification (See 9.1), and
stated in each system are not exact equivalents; therefore, each
3.1.4 Supplementary requirements desired, including the
system must be used independently of the other. Combining
standards of acceptance.
values from the two systems may result in nonconformance
with the specification.
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
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 Nov. 1, 2007. Published November 2007. Originally
7.1 Material furnished to this specification shall conform to
approved in 1988. Last previous edition approved in 2003 as A890/A890M – 99
(2003). DOI: 10.1520/A0890_A0890M-99R07.
the requirements of SpecificationA781/A781M, including any
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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A890/A890M – 99 (2007)
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
1A, 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 temperature, quench in water or rapid
cool by other means.
plementary Requirement S33 Post Weld/Heat Treatment shall
2A Heat to 2050°F [1120°C] minimum, hold for sufficient time to
be included in the purchase order.
heat casting uniformly to temperature, quench in water or rapid
cool by other means.
3A Heat to 1950°F [1070°C] minimum, hold for sufficient time to
9. Product Marking
heat casting uniformly to temperature, quench in water or rapid
cool by other means.
9.1 Castings shall be marked for material identification with
4A Heat to 2050°F [1120°C] minimum for sufficient time to heat
the specification designation and grade. In addition, the manu-
casting uniformly to temperature and water quench, or the
casting may be furnace cooled to 1850°F [1010°C] minimum,
facturer’s name or identification mark and the pattern number
hold for 15 min minimum and then water quench. A rapid cool
shall be cast or stamped using low-stress stamps on all
by other means may be employed in lieu of water quench.
5A Heat to 2050°F [1120°C] minimum, hold for sufficient time to
castings.Small-sizecastingsmaybesuchthatmarkingmustbe
heat casting to temperature, furnace cool to 1910°F [1045°C]
limited consistent with the available area. The marking of heat
minimum, quench in water or rapid cool by other means.
numbers on individual castings shall be agreed upon between
6A Heat to 2010°F [1100°C] minimum, hold for sufficient time to
heat casting uniformly to temperature, quench in water or cool
the manufacturer and the purchaser. Marking shall be in such
rapidly by other means.
position as not to injure the usefulness of the casting.
10. Keywords
this specification. In case of conflict between the requirements
of this specification and Specification A781/A781M, this
10.1 austenite; duplex stainless steel; ferrite; stainless steel;
specification shall prevail.
steel castings
8. Repair by Welding
8.1 The composition of the deposited weld metal may be
similar to that of the casting or may be suitably alloyed to
achieve the desired corrosion resistance and m
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