ASTM A958/A958M-24
(Specification)Standard Specification for Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades
Standard Specification for Steel Castings, Carbon and Alloy, with Tensile Requirements, Chemical Requirements Similar to Standard Wrought Grades
ABSTRACT
This specification covers carbon and low-alloy steel castings. The steel specimens shall be heat treated and shall conform to the required values of austenitizing temperature and tempering temperature. The steel materials shall conform to the required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, and molybdenum. Tensile tests shall be performed and the steel specimens shall conform to the required values of tensile strength, yield strength, and elongation.
SCOPE
1.1 This specification covers carbon and low-alloy steel castings having chemical analyses similar to those of the standard wrought grades.
1.2 Several classes are covered and are designated by chemical composition as shown in Table 1.
1.3 Options for tensile properties are shown in Tables 2 and 3.
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.
1.4.1 Within the text, the SI units are shown in brackets.
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.
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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: A958/A958M − 24
Standard Specification for
Steel Castings, Carbon and Alloy, with Tensile
Requirements, Chemical Requirements Similar to Standard
1
Wrought Grades
This standard is issued under the fixed designation A958/A958M; 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* and Alloy, Common Requirements, for General Industrial
Use
1.1 This specification covers carbon and low-alloy steel
castings having chemical analyses similar to those of the
3. General Conditions for Delivery
standard wrought grades.
3.1 Material furnished to this specification shall conform to
1.2 Several classes are covered and are designated by
the requirements of Specification A781/A781M, including any
chemical composition as shown in Table 1.
supplementary requirements that are indicated in the purchase
order. Failure to comply with the general requirements of
1.3 Options for tensile properties are shown in Tables 2 and
Specification A781/A781M constitutes nonconformance with
3.
this specification. In case of conflict between the requirements
1.4 The values stated in either SI units or inch-pound units
of this specification and Specification A781/A781M, this
are to be regarded separately as standard. The values stated in
specification shall prevail.
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
1.4.1 Within the text, the SI units are shown in brackets.
general requirements of Specification A957/A957M consti-
1.5 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.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Ordering Information
4.1 Orders for material under this specification should
2. Referenced Documents
include the following information:
2
2.1 ASTM Standards:
4.1.1 Quantity,
A488/A488M Practice for Steel Castings, Welding, Qualifi-
4.1.2 Specification, including year and date of issue,
cations of Procedures and Personnel
4.1.3 Grade and class of steel,
A781/A781M Specification for Castings, Steel and Alloy,
4.1.4 Description of the casting by pattern number or
Common Requirements, for General Industrial Use
drawing (dimensional tolerances should be included on the
A957/A957M Specification for Investment Castings, Steel
casting drawing),
4.1.5 Options in the specification, and
4.1.6 Supplementary requirements desired, including stan-
1 dards of acceptance.
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
5. Heat Treatment
A01.18 on Castings.
Current edition approved March 1, 2024. Published March 2024. Originally
5.1 All castings shall receive a heat treatment indicated in
approved in 1996. Last previous edition approved in 2017 as A958/A958M – 17.
Table 4. Preliminary heat treatment prior to final heat treatment
DOI: 10.1520/A0958_A0958M-24.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or as well as multiple tempering is permitted.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2 Heat treatment shall be performed after the castings
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. have been allowed to cool below the transformation range.
*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 ----------------------
A958/A958M − 24
A,B
TABLE 1 Chemical Requirements
Composition, Weight %
Grade
Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium Molybdenum
SC 1020 0.18–0.23 0.40–0.80 0.040 0.040 0.30–0.60 . .
...
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: A958/A958M − 17 A958/A958M − 24
Standard Specification for
Steel Castings, Carbon and Alloy, with Tensile
Requirements, Chemical Requirements Similar to Standard
1
Wrought Grades
This standard is issued under the fixed designation A958/A958M; 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 castings having chemical analyses similar to thatthose of the standard
wrought grades.
1.2 Several classes are covered and are designated by chemical composition as shown in Table 1.
1.3 Options for tensile properties are shown in Tables 2 and 3.
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.
1.4.1 Within the text, the SI units are shown in brackets.
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:
A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
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
3. General Conditions for Delivery
3.1 Material furnished to this specification shall conform to 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
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 1, 2017March 1, 2024. Published May 2017March 2024. Originally approved in 1996. Last previous edition approved in 20152017 as
A958 – 15.A958/A958M – 17. DOI: 10.1520/A0958_A0958M-17.10.1520/A0958_A0958M-24.
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.
*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 ----------------------
A958/A958M − 24
TABLE 1 Chemical Composition, WeightPercent
NOTE 1—Values are maximum unless a range is given.
C Mn PSSiNiCrMo
Grade
SC 1020 0.18/0.23 0.40/0.80 0.040 0.040 0.30/0.60 - - -
SC 1025 0.22/0.28 0.40/0.80 0.040 0.040 0.30/0.60 - - -
SC 1030 0.28/0.34 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 1040 0.37/0.44 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 1045 0.43/0.50 0.50/0.90 0.040 0.040 0.30/0.60 - - -
SC 4130 0.28/0.33 0.40/0.80 0.035 0.040 0.30/0.60 - 0.80/1.10 0.15/0.25
SC 4140 0.38/0.43 0.70/1.10 0.035 0.040 0.30/0.60 - 0.80/1.10 0.15/0.25
SC 4330 0.28/0.33 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30
SC 4340 0.38/0.43 0.60/0.90 0.035 0.040 0.30/0.60 1.65/2.00 0.70/0.90 0.20/0.30
SC 8620 0.18/0.23 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
SC 8625 0.23/0.28 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
SC 8630 0.28/0.33 0.60/1.00 0.035 0.040 0.30/0.60 0.40/0.70 0.40/0.60 0.15/0.25
A,B
TABLE 1 Chemical Requirements
Composition, Weight %
Grade
Carbon Manganese Phosphorus Sulfur Silicon Nickel Chromium Molybdenum
SC 1020 0.18–0.23 0.40–0.80 0.040 0.040 0.30–0.60 . . . . . . . . .
SC 1025 0.22–0.28 0.40–0.80 0.040 0.040 0.30–0.60 . . . . . . . . .
SC 1030 0.28–0.34 0.50–0.90 0.040 0.040 0.30–0.60 . . . . . . . . .
SC 1040 0.37–0.44 0.50–0.90 0.040 0.040 0.30–0.60 . . . . . . . . .
SC 1045 0.43–0.50 0.50–0.90 0.040 0.040 0.30–0.60 . . . . . . . . .
SC 4130 0.28–0.33 0.40–
...
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