ASTM A958/A958M-15
(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 that 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. (A) “X” denotes that the properties may be achieved by at least one of the heat treatments referenced in 5. The effect of section thickness should be considered in making grade selections. The heat treatment requirements do not imply that all section thicknesses will be through hardened.(B) These grades significantly exceed the minimum strength levels; therefore, they may be unsuitable for use due to weldability, and machinability issues.
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-conformance with the standard.
1.4.1 Within the text, the SI units are shown in brackets.
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Designation:A958/A958M −15
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 designationA958/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* 3. General Conditions for Delivery
3.1 Material furnished to this specification shall conform to
1.1 This specification covers carbon and low-alloy steel
the requirements of Specification A781/A781M, including any
castings having chemical analyses similar to that of the
supplementary requirements that are indicated in the purchase
standard wrought grades.
order. Failure to comply with the general requirements of
1.2 Several classes are covered and are designated by
Specification A781/A781M constitutes nonconformance with
chemical composition as shown in Table 1.
this specification. In case of conflict between the requirements
1.3 Options for tensile properties are shown in Tables 2 and
of this specification and Specification A781/A781M, this
3.
specification shall prevail.
1.4 The values stated in either SI units or inch-pound units
3.2 Steel investment castings furnished to this specification
are to be regarded separately as standard. The values stated in
shall conform to the requirements of Specification A957/
each system may not be exact equivalents; therefore, each
A957M, including any supplementary requirements that are
system shall be used independently of the other. Combining
indicated in the purchase order. Failure to comply with the
values from the two systems may result in non-conformance
general requirements of Specification A957/A957M consti-
with the standard.
tutes nonconformance with this specification. In case of con-
1.4.1 Within the text, the SI units are shown in brackets. flict between the requirements of this specification and Speci-
fication A957/A957M, Specification A957/A957M shall
2. Referenced Documents prevail.
2
2.1 ASTM Standards:
4. Ordering Information
A488/A488M Practice for Steel Castings, Welding, Qualifi-
4.1 Orders for material under this specification should
cations of Procedures and Personnel
include the following information.
A781/A781M Specification for Castings, Steel and Alloy,
4.1.1 Quantity,
Common Requirements, for General Industrial Use
4.1.2 Specification, including year and date of issue,
A957/A957M Specification for Investment Castings, Steel
4.1.3 Grade and class of steel,
and Alloy, Common Requirements, for General Industrial
4.1.4 Description of the casting by pattern number or
Use
drawing (Dimensional tolerances should be included on the
A1067/A1067M Specification for Test Coupons for Steel
casting drawing.),
Castings
4.1.5 Options in the specification, and
E29 Practice for Using Significant Digits in Test Data to
4.1.6 Supplementary requirements desired, including stan-
Determine Conformance with Specifications
dards of acceptance.
5. Heat Treatment
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
5.1 All castings shall receive a heat treatment indicated in
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
Table 4. Preliminary heat treatment prior to final heat treatment
A01.18 on Castings.
Current edition approved Dec. 1, 2015. Published December 2015. Originally as well as multiple tempering is permitted.
approved in 1996. Last previous edition approved in 2014 as A958 – 14. DOI:
5.2 Heat treatment shall be performed after the castings
10.1520/A0958_A0958M-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or have been allowed to cool below the transformation range.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 The furnace temperature for heat treating shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. effectively controlled by the use of recording-type pyrometers.
*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−15
TABLE 1 Chemical Composition, Weight Percent
NOTE 1—Values are maximum unless a range is given.
Grade C Mn P S Si Ni Cr Mo
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 - -
...
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 − 14 A958/A958M − 15
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 that 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 non-conformance with the standard.
1.4.1 Within the text, the SI units are shown in brackets.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
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
A1067/A1067M Specification for Test Coupons for Steel Castings
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
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
Specification A781/A781M constitutes nonconformance with this specification. In case of conflict between the requirements of this
specification and Specification A781/A781M, this specification shall prevail.
3.2 Steel investment castings furnished to this specification shall conform to the requirements of Specification A957/A957M,
including any supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements
of Specification A957/A957M constitutes nonconformance with this specification. In case of conflict between the requirements of
this specification and Specification A957/A957M, Specification A957/A957M shall prevail.
4. Ordering Information
4.1 Orders for material under this specification should include the following information.
4.1.1 Quantity,
4.1.2 Specification, including year and date of issue,
4.1.3 Grade and class of steel,
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, 2014Dec. 1, 2015. Published March 2014December 2015. Originally approved in 1996. Last previous edition approved in 20102014
as A958 – 10.A958 – 14. DOI: 10.1520/A0958_A0958M-14.10.1520/A0958_A0958M-15.
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 − 15
TABLE 1 Chemical Composition, Weight Percent
NOTE 1—Values are maximum unless a range is given.
Grade C Mn P S Si Ni Cr Mo
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
...
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