ASTM A732/A732M-98
(Specification)Standard Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
Standard Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
SCOPE
1.1 This specification covers carbon and low-alloy steel castings made by the investment casting process.
1.2 Fifteen grades of steel and two cobalt alloy grades are covered (see Appendix)
. Note 1—An investment casting is one that is produced in a mold, obtained by investing (surrounding) an expendable pattern with a refractory slurry which is allowed to solidify. The expendable pattern may consist of wax, plastic, or other material and is removed by heating prior to filling the mold with liquid metal.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the 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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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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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: A 732/A732M – 98 An American National Standard
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Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Castings, Investment, Carbon and Low Alloy Steel for
General Application, and Cobalt Alloy for High Strength at
1
Elevated Temperatures
This standard is issued under the fixed designation A 732/A732M; 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 Stress-Rupture Tests of Metallic Materials
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E 165 Test Method for Liquid Penetrant Examination
1.1 This specification covers carbon and low-alloy steel
E 192 Reference Radiographs of Investment Steel Castings
castings made by the investment casting process.
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for Aerospace Applications
1.2 Fifteen grades of steel and two cobalt alloy grades are
E 350 Test Methods for Chemical Analysis of Carbon Steel,
covered (see Appendix).
Low-Alloy Steel, Silicon Electrical Steel, Ingot Iron, and
NOTE 1—An investment casting is one that is produced in a mold, 5
Wrought Iron
obtained by investing (surrounding) an expendable pattern with a refrac-
E 446 Reference Radiographs for Steel Castings up to 2 in.
tory slurry which is allowed to solidify. The expendable pattern may
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(51 mm) in Thickness
consist of wax, plastic, or other material and is removed by heating prior
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E 709 Guide for Magnetic Particle Examination
to filling the mold with liquid metal.
1.3 The values stated in either inch-pound units or SI units
3. Ordering Information
are to be regarded separately as standard. Within the text, the
3.1 Orders for material under this specification should
SI units are shown in brackets. The values stated in each
include the following information:
system are not exact equivalents; therefore, each system must
3.1.1 Description of the casting by part or pattern number or
be used independently of the other. Combining values from the
drawing,
two systems may result in nonconformance with the specifi-
3.1.2 ASTM designation and year of issue,
cation.
3.1.3 Grade of steel,
3.1.4 Quantity,
2. Referenced Documents
3.1.5 Options in the specification (4.1, 5.3, 6.1, 9.1, and
2.1 ASTM Standards:
10.3), and
A 370 Test Methods and Definitions for Mechanical Testing
3.1.6 Supplementary requirements.
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of Steel Products
A 488/A488M Practice for Steel Castings, Welding, Quali-
4. Heat Treatment
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fications of Procedures and Personnel
4.1 Castings shall be supplied in the heat-treated condition
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A 919 Terminology Relating to Heat Treatment of Metals
with the exception of Grades 21 and 31. Heat treatment shall be
E 21 Test Methods for Elevated Temperature Tension Tests
either annealing, normalizing and tempering, or quenching and
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of Metallic Materials
tempering to obtain either the specified properties or other
E 30 Test Methods for Chemical Analysis of Steel, Cast
properties that might be agreed upon within each grade. In this
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Iron, Open-Hearth Iron, and Wrought Iron
latter instance, Supplementary Requirement S19 should be
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E 94 Guide for Radiographic Testing
used. Grades 21 and 31 shall be supplied in the as-cast
E 125 Reference Photographs for Magnetic Particle Indica-
condition unless otherwise agreed upon.
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tions on Ferrous Castings
4.2 Heat treatment shall be performed after the castings
E 139 Practice for Conducting Creep, Creep-Rupture, and
have been allowed to cool below the transformation range.
4.3 Definitions of terms relating to heat treatment shall be in
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This specification is under the jurisdiction of ASTM Committee A-1 on Steel, accordance with Terminology A 919.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
5. Chemical Composition
Current edition approved Sept. 10, 1998. Published October 1998. Originally
{1
5.1 The castings shall conform to the requirements for
published as A 732 – 76. Last previous edition A 732/A 732M – 94 .
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Annual Book of ASTM Standards, Vols 01.02 and 01.03.
chemical composition specified in Table 1 and Table 2.
3
Annual Book of ASTM Standards, Vol 01.02.
5.2 Cast or Heat Analysis—An analysis of each cast or heat
4
Annual Book of ASTM Standards, Vol 03.01.
5 shall be made by the manufacturer to determine the percent-
Annual Book of ASTM Standards, Vol 03.05.
6
ages of the elements specified in Table 1 and Table 2. The
Annual Book of ASTM Standards, Vol 03.03.
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A 732/A732M
TABLE 1 Chemical Requirements
Grade 1A 2A,2Q 3A,3Q 4A,4Q 5N 6N 7Q 8Q
Type Low Carbon Medium Medium Medium Vanadium
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