ASTM A890/A890M-99(2003)
(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
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.
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Designation: A 890/A 890M – 99 (Reapproved 2003)
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Ordering Information
1.1 Thisspecificationcoversagroupofcastduplexstainless 3.1 Orders for material to this specification shall include the
steels (austenitic/ferritic). following, as required, to describe the material adequately:
1.2 The duplex stainless steel alloys offer a combination of 3.1.1 Description of casting by pattern or drawing number
enhanced mechanical properties and corrosion resistance when (dimensional tolerance shall be included on the casting draw-
properly balanced in composition and properly heat treated. ing),
Ferrite levels are not specified, but these alloys will develop a 3.1.2 Specification designation and grade including year of
range of approximately 30 to 60 % ferrite with the balance issue,
austenite. 3.1.3 Options in the specification (See 9.1), and
1.3 The values stated in either inch-pound units or metric 3.1.4 Supplementary requirements desired, including the
(SI) units are to be regarded separately as standard. Within the standards of acceptance.
text the metric (SI) units are shown in brackets. The values
4. Process
stated in each system are not exact equivalents; therefore, each
system must be used independently of the other. Combining 4.1 The steel shall be made by the electric furnace process
with or without separate refining such as argon-oxygen-
values from the two systems may result in nonconformance
with the specification. decarburization (AOD).
5. Heat Treatment
2. Referenced Documents
2.1 ASTM Standards: 5.1 Castings shall be heat treated in accordance with the
requirements in Table 1.
A 370 Test Methods and Definitions for MechanicalTesting
of Steel Products
NOTE 1—Proper heat treatment of these alloys is usually necessary to
A 732/A732M Specification for Castings, Investment, Car-
enhance corrosion resistance and in some cases to meet mechanical
bon and Low-Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures
TABLE 1 Heat Treatment Requirements
A 781/A781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use
Grade Heat Treatment
E 29 Practice for Using Significant Digits in Test Data to
1A, 1B, 1C Heat to 1900°F [1040°C] minimum, hold for sufficient time to
Determine Conformance With Specifications heat casting uniformly to temperature, quench in water or rapid
cool by other means.
E 562 Practice for Determining Volume Fraction by Sys-
2A Heat to 2050°F [1120°C] minimum, hold for sufficient time to
tematic Manual Point Count
heat casting uniformly to temperature, quench in water or rapid
cool by other means.
E 1245 Practice for Determining the Inclusion or Second-
3A Heat to 1950°F [1070°C] minimum, hold for sufficient time to
Phase Constituent Content of Metals by Automatic Image
heat casting uniformly to temperature, quench in water or rapid
Analysis
cool by other means.
4A Heat to 2050°F [1120°C] minimum for sufficient time to heat
casting uniformly to temperature and water quench, or the
casting may be furnace cooled to 1850°F [1010°C] minimum,
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
hold for 15 min minimum and then water quench. A rapid cool
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
by other means may be employed in lieu of water quench.
A01.18 on Castings.
5A Heat to 2050°F [1120°C] minimum, hold for sufficient time to
Current edition approved Oct. 1, 2003. Published October 2003. Originally
heat casting to temperature, furnace cool to 1910°F [1045°C]
approved in 1988. Last previous edition approved in 1999 as A 890/A 890M – 99.
minimum, quench in water or rapid cool by other means.
Annual Book of ASTM Standards, Vol 01.03.
6A Heat to 2010°F [1100°C] minimum, hold for sufficient time to
Annual Book of ASTM Standards, Vol 01.02.
heat casting uniformly to temperature, quench in water or cool
Annual Book of ASTM Standards, Vol 14.02. rapidly by other means.
Annual Book of ASTM Standards, Vol 03.01.
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A 890/A 890M – 99 (2003)
properties. Minimum heat-treat temperatures are specified; however, it is
8.2 Weld repairs shall be subject to the same quality
sometimes necessary to heat-treat at higher temperatures, hold for some
standards as are used to inspect the castings.
minimum time at temperature and then rapidly cool the castings in order
8.3 When post weld/heat treatment is believed necessary for
to enhance the corrosion resistance and meet mechanical properties.
adequate corrosion resistance or impact resistance, Sup-
plementary Requirement S33 Post Weld/Heat Treatment shall
6. Chemical Composition
be included in the purchase order.
6.1 The steel shall conform to the requirements as to
chemical composition prescribed in Table 2.
9. Product Marking
7. General Requirements
9.1 Castings shall be marked for material identification with
the specification designation and grade. In addition, the manu-
7.1 Material furnished to this specification shall conform to
facturer’s name or identification mark and the pattern number
the requirements of Specification A 781/A 781M, including
shall be cast or stamped using low-stress stamps on all
any supplementary requirements that are indicated in the
castings.Small-sizecastingsmaybesuchthatmarkingmustbe
purchase order. Failure to comply with the general require-
limited consistent with the available area. The marking of heat
ments of Specification A 781/A 781M constitutes nonconfor-
numbers on individual castings shall be agreed upon between
mance with this specification. In case of conflict between the
the manufacturer and the purchaser. Marking shall be in such
requirements of this specification and Specification A 781/
position as not to injure the usefulness of the casting.
A 781M, this specification shall prevail.
8. Repair by Welding 10. Keywords
10.1 austenite; duplex stainless steel; ferrite; stainless steel;
8.1 The composition of the deposited weld metal may be
similar to that of the casting or may be suitably alloyed to steel castings
achieve the desired corrosion resistance and mechanical prop-
erties.
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