ASTM A732/A732M-02

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Designation: A 732/A732M – 02
Standard Specification for
Castings, Investment, Carbon and Low Alloy Steel for
General Application, and Cobalt Alloy for High Strength at
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Elevated Temperatures
This standard is issued under the fixed designationA732/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 E 94 Guide for Radiographic Examination
E 125 Reference Photographs for Magnetic Particle Indica-
1.1 This specification covers carbon and low-alloy steel
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tions on Ferrous Castings
castings made by the investment casting process.
E 139 Practice for Conducting Creep, Creep-Rupture, and
1.2 Fifteen grades of steel and two cobalt alloy grades are
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Stress-Rupture Tests of Metallic Materials
covered (see Appendix).
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E 165 Test Method for Liquid Penetrant Examination
NOTE 1—An investment casting is one that is produced in a mold,
E 192 Reference Radiographs for Investment Steel Castings
obtained by investing (surrounding) an expendable pattern with a refrac-
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for Aerospace Applications
tory slurry which is allowed to solidify. The expendable pattern may
E 350 Test Methods for ChemicalAnalysis of Carbon Steel,
consist of wax, plastic, or other material and is removed by heating prior
Low-Slloy Steel, Silicon Electrical Steel, Ingot Iron, and
to filling the mold with liquid metal.
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Wrought Iron
1.3 The values stated in either inch-pound units or SI units
E 446 Reference Radiographs for Steel Castings up to 2 in.
are to be regarded separately as standard. Within the text, the
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(51 mm) in Thickness
SI units are shown in brackets. The values stated in each
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E 709 Guide for Magnetic Particle Examination
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
3. Ordering Information
two systems may result in nonconformance with the specifi-
3.1 Orders for material under this specification should
cation.
include the following information:
3.1.1 Description of the casting by part or pattern number or
2. Referenced Documents
drawing,
2.1 ASTM Standards:
3.1.2 ASTM designation and year of issue,
A 370 Test Methods and Definitions for MechanicalTesting
3.1.3 Grade of steel,
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of Steel Products
3.1.4 Quantity,
A 488/A488M Practice for Steel Castings, Welding, Quali-
3.1.5 Options in the specification (4.1, 5.3, 6.1, 9.1, and
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fications of Procedures and Personnel
10.3), and
A 941 Terminology Relating to Steel, Stainless Steel, Re-
3.1.6 Supplementary requirements.
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lated Alloys, and Ferroalloys
E 21 Test Methods for Elevated Temperature Tension Tests
4. Heat Treatment
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of Metallic Materials
4.1 Castings shall be supplied in the heat-treated condition
E 30 Test Methods for Chemical Analysis of Steel, Cast
withtheexceptionofGrades21and31.Heattreatmentshallbe
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Iron, Open-Hearth Iron, and Wrought Iron
either annealing, normalizing and tempering, or quenching and
tempering to obtain either the specified properties or other
properties that might be agreed upon within each grade. In this
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This specification is under the jurisdiction of ASTM committee A01 on Steel,
latter instance, Supplementary Requirement S19 should be
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
used. Grades 21 and 31 shall be supplied in the as-cast
Current edition approved Sept. 10, 2002. Published October 2002. Originally
condition unless otherwise agreed upon.
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published as A 732 – 76. Last previous edition A 732/A 732M – 98 .
2 4.2 Heat treatment shall be performed after the castings
Annual Book of ASTM Standards, Vol 01.03.
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Annual Book of ASTM Standards, Vol 01.02. have been allowed to cool below the transformation range.
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Annual Book of ASTM Standards, Vol 01.01.
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Annual Book of ASTM Standards, Vol 03.01.
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Annual Book of ASTM Standards, Vol 03.05.
Annual Book of ASTM Standards, Vol 03.03.
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A 732/A732M – 02
TABLE 2 Chemical Requirements-Cobalt Alloys
4.3 Definitions of terms relating to heat treatment shall be in
accordance with Terminology A 941.
Type Grade 21 Grade 31
5. Chemical Composition
Carbon 0.20–0.30 0.45–0.55
5.1 The castings shall conform to the requirements for
Manganese, max. 1.00 1.00
chemical composition specified in Table 1 and Table 2.
Silicon, max 1.00 1.00
Phosphorus, max 0.040 0.040
5.2 Cast or Heat Analysis—An analysis of each cast or heat
Sulfur, max 0.040 0.040
shall be made by the manufacturer to determine th
...