ASTM A732/A732M-20

Standard Specification for Castings, Investment, Carbon and Low-Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures

ABSTRACT
This specification covers carbon and low-alloy steel and cobalt alloy castings made by the investment casting process. Fifteen grades of steel and two cobalt alloy grades are covered. Steel castings shall be heat treated either by full annealing, normalizing, normalizing and tempering, or quenching and tempering to obtain the specified properties or other properties that have been agreed upon within each grade. The castings shall conform to the requirements for chemical composition specified.
SCOPE
1.1 This specification covers carbon and low-alloy steel and cobalt alloy castings made by the investment casting process.  
1.2 Fifteen grades of steel and two cobalt alloy grades are covered.  
1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The supplementary requirements shall apply only when specified individually by the purchaser in the purchase order or contract.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 30-Apr-2020
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Referred By: ASTM A494/A494M-22 - Standard Specification for Castings, Nickel and Nickel Alloy
• Effective Date: 01-May-2020
• Referred By: ASTM A957/A957M-21 - Standard Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
• Effective Date: 01-May-2020
• Referred By: ASTM A897/A897M-22 - Standard Specification for Austempered Ductile Iron Castings
• Effective Date: 01-May-2020
• Referred By: ASTM A395/A395M-99(2022) - Standard Specification for Ferritic Ductile Iron Pressure-Retaining Castings for Use at Elevated Temperatures
• Effective Date: 01-May-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A732/A732M −20
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 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* Standards, Visual Examination
E21 TestMethodsforElevatedTemperatureTensionTestsof
1.1 This specification covers carbon and low-alloy steel and
Metallic Materials
cobalt alloy castings made by the investment casting process.
E139 Test Methods for Conducting Creep, Creep-Rupture,
1.2 Fifteen grades of steel and two cobalt alloy grades are
and Stress-Rupture Tests of Metallic Materials
covered.
3. Ordering Information
1.3 Supplementary requirements of an optional nature are
provided for use at the option of the purchaser. The supple- 3.1 Orders for castings under this specification should
mentary requirements shall apply only when specified indi- include the following information:
vidually by the purchaser in the purchase order or contract. 3.1.1 Quantity,
3.1.2 ASTM designation and issue date,
1.4 The values stated in either SI units or inch-pound units
3.1.3 Grade designation (Tables 1 and 2), and
are to be regarded separately as standard. The values stated in
3.1.4 Description of casting by part, pattern, or drawing
each system may not be exact equivalents; therefore, each
number. (Dimensional tolerances and machined surfaces shall
system shall be used independently of the other. Combining
be indicated on the casting drawing.)
values from the two systems may result in nonconformance
with the standard. 3.2 The purchaser should specify any of the following
information to adequately describe the desired material:
1.5 This international standard was developed in accor-
3.2.1 Heat-treat condition (see 5.1 and 5.2),
dance with internationally recognized principles on standard-
3.2.2 Repairwelding(seeSection8andSpecificationA957/
ization established in the Decision on Principles for the
A957M),
Development of International Standards, Guides and Recom-
3.2.3 Source inspection, if any (see Specification A957/
mendations issued by the World Trade Organization Technical
A957M), and
Barriers to Trade (TBT) Committee.
3.2.4 Supplementary requirements required (marking,
2. Referenced Documents certification, mechanical properties, NDT, and the like).
2
2.1 ASTM Standards:
4. General Requirements
A941 TerminologyRelatingtoSteel,StainlessSteel,Related
4.1 Material furnished to this specification shall conform to
Alloys, and Ferroalloys
the requirements of Specification A957/A957M, including any
A957/A957M Specification for Investment Castings, Steel
supplementary requirements that are indicated on the purchase
and Alloy, Common Requirements, for General Industrial
order. Failure to comply with the requirements of Specification
Use
A957/A957M constitutes nonconformance with this specifica-
A997 Practice for Investment Castings, Surface Acceptance
tion. In case of conflict of this specification and Specification
A957/A957M, this specification shall prevail.
1
This specification is under the jurisdiction of ASTM committee A01 on Steel,
5. Heat Treatment
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
5.1 Steel castings shall be heat treated either by full
Current edition approved May 1, 2020. Published May 2020. Originally
annealing,normalizing,normalizingandtempering,orquench-
approved in 1976. Last previous edition approved in 2014 as A732/A732M – 14.
DOI: 10.1520/A0732_A0732M-20.
ing and tempering to obtain the specified properties or other
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
properties that have been agreed upon within each grade. In
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
this latter instance, Supplementary Requirement S53 shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A732/A732M−20
TABLE 1 Chemical Requirements
Grade 1A 2A, 2Q 3A, 3Q 4A, 4Q 5N 6N 7Q 8Q
Medium Medium Medium Manganese Chromium Chromium
Low Carbon Vanadium
Type Carbon Carbon Car
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A732/A732M − 14 A732/A732M − 20
Standard Specification for
Castings, Investment, Carbon and Low Alloy Low-Alloy
Steel for General Application, and Cobalt Alloy for High
1
Strength at Elevated Temperatures
This standard is issued under the fixed designation A732/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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers carbon and low-alloy steel and cobalt alloy castings made by the investment casting process.
1.2 Fifteen grades of steel and two cobalt alloy grades are covered.
1.3 Supplementary requirements of an optional nature are provided for use at the option of the purchaser. The supplementary
requirements shall apply only when specified individually by the purchaser in the purchase order or contract.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformancenonconformance with the standard.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A997 Practice for Investment Castings, Surface Acceptance Standards, Visual Examination
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E139 Test Methods for Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials
3. Ordering Information
3.1 Orders for castings under this specification should include the following information:
3.1.1 Quantity,
3.1.2 ASTM designation and issue date,
3.1.3 Grade designation (Tables 1 and 2), and
3.1.4 Description of casting by part, pattern, or drawing number. (Dimensional tolerances and machined surfaces shall be
indicated on the casting drawing.).drawing.)
3.2 The purchaser should specify any of the following information to describe adequately describe the desired material:
3.2.1 Heat-treat condition (see 5.1 and 5.2),
3.2.2 Repair welding (see Section 8 and Specification A957/A957M),
3.2.3 Source inspection, if any (see Specification A957/A957M), and
3.2.4 Supplementary requirements required (marking, certification, mechanical properties, NDT, and the like).
1
This specification is under the jurisdiction of ASTM committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.18
on Castings.
Current edition approved March 1, 2014May 1, 2020. Published March 2014May 2020. Originally approved in 1976. Last previous edition approved in 20092014 as
A732/A732M – 09.A732/A732M – 14. DOI: 10.1520/A0732_A0732M-14.10.1520/A0732_A0732M-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A732/A732M − 20
TABLE 1 Chemical Requirements
Grade 1A 2A,2Q2A, 2Q 3A,3Q 3A, 3Q 4A,4Q4A, 4Q 5N 6N 7Q 8Q
Medium Medium Medium Manganese Chromium Chromium
Low Carbon Vanadium
Type Carbon Carbon Carbon Molybdenum Molybdenum Molybdenum
A
IC 1020 IC 6120
IC 1030 IC 1040 IC 1050 IC 4020 IC 4130 IC 4140
Carbon 0.15 to 0.25 0.25 to 0.35 0.35 to 0.45 0.45 to 0.55 0.30 max 0.35 max 0.25 to 0.35 0.35 to 0.45
Manganese 0.20 to 0.60 0.70 to 1.00 0.70 to 1.00 0.70 to 1.00 0.70 to 1.00 1.35 to 1.75 0.40 to 0.70 0.70 to 1.00
Phosphorus, max 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04
Sulfur, max 0.045 0.045 0.045 0.045 0.045 0.045 0.045 0.045
Silicon 0.20 to 1.00 0.20 to 1.00 0.20
...