ASTM A995-98

Designation: A 995 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for
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Pressure-Containing Parts
This standard is issued under the fixed designation A 995; 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.
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1. Scope Systematic Manual Point Count
1.1 This specification covers austenitic-ferritic (duplex)
3. Terminology
stainless steel castings for valves, flanges, fittings, and other
3.1 Definitions of Terms Specific to This Standard:
pressure-containing parts.
3.1.1 duplex stainless steel—an iron-chromium-nickel-
1.2 The duplex stainless steels offer a combination of
molybdenum alloy which when properly heat treated consists
enhanced mechanical properties and corrosion resistance when
of approximately 30 to 60 % ferrite with the balance austenite.
properly balanced in composition and properly heat treated.
Ferrite levels are not specified, but these grades will develop a
4. General Conditions for Delivery
range of approximately 30 to 60 % ferrite with the balance
4.1 Material furnished to this specification shall conform to
austenite. It is the responsibility of the purchaser to determine
the applicable requirements of Specification A 703/A 703M,
which grade shall be furnished depending on design and
including the supplementary requirements that are indicated on
service conditions, mechanical properties, and corrosion-
the purchaser order. Failure to comply with the general
resistant characteristics.
requirements of Specification A 703/A 703M constitutes non-
NOTE 1—Because of the possibility of precipitation of embrittling
conformance with this specification. In case of conflict be-
phases, the grades included in this specification are not recommended for
tween the requirements of the specification and Specification
service at temperatures above 600°F [315°C].
A 703/A 703M, this specification shall prevail.
1.3 The values stated in either inch-pound units or SI units
5. Ordering Information
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
5.1 It is the responsibility of the purchaser to specify all
system are not exact equivalents; therefore, each system must
requirements that are necessary for material ordered under this
be used independently of the other. Combining values from the
specification. Such requirements may included, but are not
two systems may result in nonconformance with the specifi-
limited to, the following:
cation.
5.1.1 A description of the casting by pattern number or
drawing (dimensional tolerances shall be included on the
2. Referenced Documents
casting drawing),
2.1 ASTM Standards:
5.1.2 Quantity (weight and number of castings),
A 488/A 488M Practice for Steel Castings, Welding, Quali-
5.1.3 Specification designation and date of issue,
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fication of Procedures and Personnel
5.1.4 Grade of steel,
A 703/A 703M Specification for Steel Castings, General
5.1.5 Supplementary requirements including acceptance cri-
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Requirements, for Pressure-Containing Parts
teria,
E 125 Reference Photographs for Magnetic Particle Indica-
5.1.6 Additional requirements.
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tions on Ferrous Castings
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6. Process
E 165 Test Method for Liquid Penetrant Examination
E 562 Test Method for Determining Volume Fraction by
6.1 The steel shall be made by the electric furnace process
with or without separate refining.
7. Heat Treatment
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This specification is under the jurisdiction of ASTM Committee A-01 on Steel,
7.1 All castings shall be heat treated in accordance with
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
Table 1.
A01.18 on Castings.
Current edition approved Sept. 10, 1998. Published November 1998.
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Annual Book of ASTM Standards, Vol 01.02.
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Annual Book of ASTM Standards, Vol 03.03. Annual Book of ASTM Standards, Vol 03.01.
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A 995
TABLE 1 Heat Treatment Requirements
11. Repair by Welding
Grade Heat Treatment
11.1 Repairs shall be made using procedures and welders
1A, 1B Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat
qualified under Practice A 488/A 488M.
casting uniformly to temperature, quench in water or rapid cool by
11.2 The composition of the deposited weld metal may be
other means.
similar to that of the casting or may be suitably alloyed to
2A Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat
casting uniformly to temperature, quench in water or rapid cool by
achieve the desired corrosion resistance and mechanical prop-
other means.
erties.
3A Heat to 1950°F [1070°C] minimum, h
...