ASTM A148/A148M-20
(Specification)Standard Specification for Steel Castings, High Strength, for Structural Purposes
Standard Specification for Steel Castings, High Strength, for Structural Purposes
ABSTRACT
This specification covers the standard for carbon steel, alloy steel, and martensitic stainless steel castings that are to be subjected to higher mechanical stresses. All castings shall undergo heat treatment either by full annealing, normalizing, normalizing and tempering, or quenching and tempering and shall be regulated under pyrometers. Several grades of steel castings are covered and shall conform to the required chemical composition for sulfur and phosphorus. A tension test shall be performed and shall conform to the required tensile strength, yield point, and elongation. The notch bar impact properties shall also be determined by testing one set of three Charpy V-notch impact specimens.
SCOPE
1.1 This specification covers carbon steel, alloy steel, and martensitic stainless steel castings that are to be subjected to higher mechanical stresses than those covered in Specification A27/A27M.
1.2 Several grades of steel castings are covered, having the chemical composition and mechanical properties prescribed in Tables 1 and 2.
1.3 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.
1.3.1 Within the text, the SI units are shown in brackets.
1.4 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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Designation: A148/A148M −20
Standard Specification for
1
Steel Castings, High Strength, for Structural Purposes
This standard is issued under the fixed designationA148/A148M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* andAlloy, Common Requirements, for General Industrial
Use
1.1 This specification covers carbon steel, alloy steel, and
A1067/A1067MSpecification for Test Coupons for Steel
martensitic stainless steel castings that are to be subjected to
Castings
higher mechanical stresses than those covered in Specification
E29Practice for Using Significant Digits in Test Data to
A27/A27M.
Determine Conformance with Specifications
1.2 Several grades of steel castings are covered, having the
chemical composition and mechanical properties prescribed in
3. General Conditions for Delivery
Tables 1 and 2.
3.1 Except for castings produced by the investment casting
1.3 The values stated in either SI units or inch-pound units
process, material furnished to this specification shall conform
are to be regarded separately as standard. The values stated in
to the requirements of Specification A781/A781M, including
each system may not be exact equivalents; therefore, each
any supplementary requirements that are indicated in the
system shall be used independently of the other. Combining
purchase order. Failure to comply with the general require-
values from the two systems may result in nonconformance
ments of Specification A781/A781M constitutes nonconfor-
with the standard.
mance with this specification. In case of conflict between the
1.3.1 Within the text, the SI units are shown in brackets.
requirements of this specification and Specification A781/
A781M, this specification shall prevail.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
3.2 Investment castings furnished to this specification shall
ization established in the Decision on Principles for the
conform to the requirements of Specification A957/A957M,
Development of International Standards, Guides and Recom-
includinganysupplementaryrequirementsthatareindicatedin
mendations issued by the World Trade Organization Technical
the purchase order. Failure to comply with the general require-
Barriers to Trade (TBT) Committee.
ments of Specification A957/A957M constitutes nonconfor-
mance with this specification. In case of conflict between the
2. Referenced Documents
requirements of this specification and Specification A957/
2
A957M, Specification A957/A957M shall prevail.
2.1 ASTM Standards:
A27/A27MSpecification for Steel Castings, Carbon, for
4. Ordering Information
General Application
A370Test Methods and Definitions for Mechanical Testing
4.1 The inquiry and order should include or indicate the
of Steel Products
following:
A781/A781MSpecification for Castings, Steel and Alloy,
4.1.1 A description of the casting by pattern number or
Common Requirements, for General Industrial Use
drawing (dimensional tolerances shall be included on the
A957/A957MSpecification for Investment Castings, Steel
casting drawing),
4.1.2 Grade of steel,
4.1.3 Options in the specification, and
1 4.1.4 The supplementary requirements desired, including
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
the standards of acceptance.
A01.18 on Castings.
4.1.5 Inthecaseofquenchandtemperedcastingstheruling
Current edition approved May 1, 2020. Published May 2020. Originally
section, T.
approved in 1955. Last previous edition approved in 2019 as A148/A148M–19.
DOI: 10.1520/A0148_A0148M-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 5. Heat Treatment
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.1 All castings shall be heat treated either by annealing,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. normalizing, normalizing and tempering, or quenching and
*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 ----------------------
A148/A148M − 20
A
TABLE 1 Chemical Composition Requirements
Element, %
Grade (UNS Number)
Phosphorus Sulfur
80-40 [550-275] (D50400) 0.05 0.06
80-50 [550-345] (D50500) 0.05 0.06
90-60 [620-415] (D50600) 0.05 0.06
105-85 [725-585] (D50850) 0.05 0.06
...
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: A148/A148M − 19 A148/A148M − 20
Standard Specification for
1
Steel Castings, High Strength, for Structural Purposes
This standard is issued under the fixed designation A148/A148M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers carbon steel, alloy steel, and martensitic stainless steel castings that are to be subjected to higher
mechanical stresses than those covered in Specification A27/A27M.
1.2 Several grades of steel castings are covered, having the chemical composition and mechanical properties prescribed in
Tables 1 and 2.
1.3 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.
1.3.1 Within the text, the SI units are shown in brackets.
1.4 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:
A27/A27M Specification for Steel Castings, Carbon, for General Application
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
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 Except for castings produced by the investment casting process, 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 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 The inquiry and order should include or indicate the following:
4.1.1 A description of the casting by pattern number or drawing (dimensional tolerances shall be included on the casting
drawing),
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 Sept. 1, 2019May 1, 2020. Published September 2019May 2020. Originally approved in 1955. Last previous edition approved in 20152019 as
A148/A148M – 15a.A148/A148M – 19. DOI: 10.1520/A0148_A0148M-19.10.1520/A0148_A0148M-20.
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 ----------------------
A148/A148M − 20
A
TABLE 1 Chemical Composition Requirements
Composition, %Element, %
Grade (UNS No.)Number)
Sulfur, Phosphorus,
maxPhosphorus maxSulfur
80-40 [550-275] (D50400) 0.06 0.05
80-40 [550-275] (D50400) 0.05 0.0
...
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