ASTM A747/A747M-18
(Specification)Standard Specification for Steel Castings, Stainless, Precipitation Hardening
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 S24.1 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.
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.
General Information
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Designation: A747/A747M − 18
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
S24.1 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
A1080 Practice for Hot Isostatic Pressing of Steel, Stainless
heat-treated condition.
Steel, and Related Alloy Castings
NOTE 1—If the service environment in which the material is to be used
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2.2 ASME Standard:
is considered conducive to stress-corrosion cracking, precipitation hard-
ASME Boiler and Pressure Vessel Code, Supplementary
ening should be performed at a temperature that will minimize the
susceptibility of the material to this type of attack. Requirements Section II, Part A
1.4 Supplementary requirements of an optional nature are
3. General Conditions for Delivery
provided for use at the option of the purchaser. The supple-
3.1 Except for investment castings, castings furnished to
mentary requirements shall apply only when specified indi-
this specification shall be in accordance with the requirements
vidually by the purchaser in the purchase order or contract.
of Specification A781/A781M, including any supplementary
1.5 This specification is expressed in both inch-pound units
requirements that are indicated in the purchase order. Failure to
and in SI units; however, unless the purchase order or contract
comply with the general requirements of Specification A781/
specifies the applicable M-specification designation (SI units),
A781M constitutes nonconformance with this specification. In
the inch-pound units shall apply.
case of conflict between the requirements of this specification
1.6 The values stated in either SI units or inch-pound units
and Specification A781/A781M, this specification shall pre-
are to be regarded separately as standard. The values stated in
vail.
each system may not be exact equivalents; therefore, each
3.2 Steel investment castings furnished to this specification
system shall be used independently of the other. Combining
shall conform to the requirements of Specification A957/
values from the two systems may result in nonconformance
A957M, including any supplementary requirements that are
with the standard.
indicated in the purchase order. Failure to comply with the
1.6.1 Within the text, the SI units are shown in brackets.
general requirements of Specification A957/A957M consti-
1.7 This international standard was developed in accor-
tutes nonconformance with this specification. In case of con-
dance with internationally recognized principles on standard-
flict between the requirements of this specification and Speci-
ization established in the Decision on Principles for the
fication A957/A957M, Specification A957/A957M shall
Development of International Standards, Guides and Recom-
prevail.
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 service@astm.org. 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 Nov. 1, 2018. Published November 2018. Originally Available from American Society of Mechanical Engineers (ASME), ASME
approved in 1977. Last previous edition approved in 2016 as A747/A747M – 16a. International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
DOI: 10.1520/A0747_A0747M-18. www.asme.
...
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 − 16a A747/A747M − 18
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].600 °F [315 °C]. They may be machined in the solution-annealed solution heat-treated condition and subsequently
precipitation hardened to the desired high-strength mechanical properties specified in Table S24.1 with little danger of cracking
or distortion.
1.3 The material is not intended for use in the solution-annealed 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 Supplementa-
rysupplementary 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 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 non-conformancenonconformance with the standard.
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.
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
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 May 15, 2016Nov. 1, 2018. Published May 2016November 2018. Originally approved in 1977. Last previous edition approved in 2016 as
A747/A747M – 16.A747/A747M – 16a. DOI: 10.1520/A0747_A0747M-16A.10.1520/A0747_A0747M-18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Three Park Ave., New York, NY 10016-5990, http://
www.asme.org.
*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
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A747/A747M − 18
with the general requirements of Specifica
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