ASTM A747/A747M-23

Standard Specification for Steel Castings, Stainless, Precipitation Hardening

ABSTRACT
This specification covers iron-chromium-nickel-copper corrosion resistance steel castings capable of being strengthened by precipitation hardening heat treatment. The steel shall be made by electric furnace process with or without separate refining such as argon-oxygen decarburization. The steel materials shall also undergo homogenization heat treatment, solution annealing heat treatment, precipitation hardening and shall conform to the required values of temperature and time and cooling treatment. The materials shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, copper, columbium, and nitrogen.
SCOPE
1.1 This specification covers iron-chromium-nickel-copper corrosion-resistant steel castings, capable of being strengthened by precipitation hardening heat treatment.  
1.2 These castings may be used in services requiring corrosion resistance and high strengths at temperatures up to 600 °F [315 °C]. They may be machined in the solution heat-treated condition and subsequently precipitation hardened to the desired high-strength mechanical properties specified in Table S51.1 with little danger of cracking or distortion.  
1.3 The material is not intended for use in the solution heat-treated condition.  
Note 1: If the service environment in which the material is to be used is considered conducive to stress-corrosion cracking, precipitation hardening should be performed at a temperature that will minimize the susceptibility of the material to this type of attack.  
1.4 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.  
1.5 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M-specification designation (SI units), the inch-pound units shall apply.  
1.6 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. Within the text, the SI units are shown in brackets.  
1.7 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: 31-Aug-2023
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

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: A747/A747M − 23
Standard Specification for
1
Steel Castings, Stainless, Precipitation Hardening
This standard is issued under the fixed designation A747/A747M; 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* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers iron-chromium-nickel-copper
corrosion-resistant steel castings, capable of being strength-
2. Referenced Documents
ened by precipitation hardening heat treatment.
2
2.1 ASTM Standards:
1.2 These castings may be used in services requiring corro-
A781/A781M Specification for Castings, Steel and Alloy,
sion resistance and high strengths at temperatures up to 600 °F
Common Requirements, for General Industrial Use
[315 °C]. They may be machined in the solution heat-treated
A957/A957M Specification for Investment Castings, Steel
condition and subsequently precipitation hardened to the de-
and Alloy, Common Requirements, for General Industrial
sired high-strength mechanical properties specified in Table
Use
S51.1 with little danger of cracking or distortion.
A1067/A1067M Specification for Test Coupons for Steel
1.3 The material is not intended for use in the solution
Castings
heat-treated condition.
3
2.2 ASME Standard:
NOTE 1—If the service environment in which the material is to be used
ASME Boiler and Pressure Vessel Code, Supplementary
is considered conducive to stress-corrosion cracking, precipitation hard-
Requirements Section II, Part A
ening should be performed at a temperature that will minimize the
susceptibility of the material to this type of attack.
3. General Conditions for Delivery
1.4 Supplementary requirements of an optional nature are
3.1 Except for investment castings, castings furnished to
provided for use at the option of the purchaser. The supple-
this specification shall be in accordance with the requirements
mentary requirements shall apply only when specified indi-
of Specification A781/A781M, including any supplementary
vidually by the purchaser in the purchase order or contract.
requirements that are indicated in the purchase order. Failure to
1.5 This specification is expressed in both inch-pound units
comply with the general requirements of Specification A781/
and in SI units; however, unless the purchase order or contract
A781M constitutes nonconformance with this specification. In
specifies the applicable M-specification designation (SI units),
case of conflict between the requirements of this specification
the inch-pound units shall apply.
and Specification A781/A781M, this specification shall pre-
1.6 The values stated in either SI units or inch-pound units
vail.
are to be regarded separately as standard. The values stated in
3.2 Steel investment castings furnished to this specification
each system may not be exact equivalents; therefore, each
shall conform to the requirements of Specification A957/
system shall be used independently of the other. Combining
A957M, including any supplementary requirements that are
values from the two systems may result in nonconformance
indicated in the purchase order. Failure to comply with the
with the standard. Within the text, the SI units are shown in
general requirements of Specification A957/A957M consti-
brackets.
tutes nonconformance with this specification. In case of con-
1.7 This international standard was developed in accor-
flict between the requirements of this specification and Speci-
dance with internationally recognized principles on standard-
fication A957/A957M, Specification A957/A957M shall
ization established in the Decision on Principles for the
prevail.
Development of International Standards, Guides and Recom-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Standards volume information, refer to the standard’s Document Summary page on
A01.18 on Castings. the ASTM website.
3
Current edition approved Sept. 1, 2023. Published September 2023. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1977. Last previous edition approved in 2018 as A747/A747M – 18. International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
DOI: 10.152
...

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: A747/A747M − 18 A747/A747M − 23
Standard Specification for
1
Steel Castings, Stainless, Precipitation Hardening
This standard is issued under the fixed designation A747/A747M; 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 iron-chromium-nickel-copper corrosion-resistant steel castings, capable of being strengthened by
precipitation hardening heat treatment.
1.2 These castings may be used in services requiring corrosion resistance and high strengths at temperatures up to 600 °F [315 °C].
They may be machined in the solution heat-treated condition and subsequently precipitation hardened to the desired high-strength
mechanical properties specified in Table S24.1S51.1 with little danger of cracking or distortion.
1.3 The material is not intended for use in the solution heat-treated condition.
NOTE 1—If the service environment in which the material is to be used is considered conducive to stress-corrosion cracking, precipitation hardening
should be performed at a temperature that will minimize the susceptibility of the material to this type of attack.
NOTE 1—If the service environment in which the material is to be used is considered conducive to stress-corrosion cracking, precipitation hardening
should be performed at a temperature that will minimize the susceptibility of the material to this type of attack.
1.4 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.
1.5 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract
specifies the applicable M-specification designation (SI units), the inch-pound units shall apply.
1.6 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. Within the text, the SI units are shown in brackets.
1.6.1 Within the text, the SI units are shown in brackets.
1.7 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.
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 Nov. 1, 2018Sept. 1, 2023. Published November 2018September 2023. Originally approved in 1977. Last previous edition approved in 20162018
as A747/A747M – 16a.A747/A747M – 18. DOI: 10.1520/A0747_A0747M-18.10.1520/A0747_A0747M-23.
*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

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A747/A747M − 23
2. Referenced Documents
2
2.1 ASTM Standards:
A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A1067/A1067M Specification for Test Coupons for Steel Castings
A1080 Practice for Hot Isostatic Pressing of Steel, Stainless Steel, and Related Alloy Castings
3
2.2 ASME Standard:
ASME Boiler and Pressure Vessel Code, Supplementary Requirements Section II, Part A
3. General Conditions for Delivery
3.1 Except for investment castings, castings furnished to this specification shall be in accordance with the requirements of
Specification A781/A781M, including any supplementary requirements that are indicated in the purchase order. Failure to comply
with the general requirements of Specification A781/A781M constitutes nonconformance with this specification. In case of conflict
between the requirements of this specification and Specification A781/A781M, this specifica
...