ASTM A148/A148M-15

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Designation:A148/A148M −15
StandardSpecification for
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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* Specification A781/A781M constitutes nonconformance with
this specification. In case of conflict between the requirements
1.1 This specification covers carbon steel, alloy steel, and
of this specification and Specification A781/A781M, this
martensitic stainless steel castings that are to be subjected to
specification shall prevail.
higher mechanical stresses than those covered in Specification
A27/A27M.
4. Ordering Information
1.2 Several grades of steel castings are covered, having the
4.1 The inquiry and order should include or indicate the
chemical composition and mechanical properties prescribed in
following:
Tables 1 and 2.
4.1.1 A description of the casting by pattern number or
1.3 The values stated in either SI units or inch-pound units
drawing (dimensional tolerances shall be included on the
are to be regarded separately as standard. The values stated in
casting drawing),
each system may not be exact equivalents; therefore, each
4.1.2 Grade of steel,
system shall be used independently of the other. Combining
4.1.3 Options in the specification, and
values from the two systems may result in non-conformance
4.1.4 The supplementary requirements desired, including
with the standard.
the standards of acceptance.
1.3.1 Within the text, the SI units are shown in brackets.
4.1.5 Inthecaseofquenchandtemperedcastingstheruling
section, T.
2. Referenced Documents
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5. Heat Treatment
2.1 ASTM Standards:
A27/A27MSpecification for Steel Castings, Carbon, for
5.1 Allcastingsshallbeheattreatedeitherbyfullannealing,
General Application
normalizing, normalizing and tempering, or quenching and
A370Test Methods and Definitions for Mechanical Testing
tempering. Unless otherwise specified in the inquiry, contract,
of Steel Products
or order, the castings may be heat treated by any of these heat
A781/A781MSpecification for Castings, Steel and Alloy,
treatmentsorcombinationoftheseheattreatmentsattheoption
Common Requirements, for General Industrial Use
of the manufacturer.
E29Practice for Using Significant Digits in Test Data to
5.2 Heat treatment shall be performed after the castings
Determine Conformance with Specifications
have been allowed to cool below the transformation range.
3. General Conditions for Delivery
6. Temperature Control
3.1 Material furnished to this specification shall conform to
6.1 Furnacetemperaturesforheat-treatingshallberegulated
the requirements of Specification A781/A781M, including any
by the use of pyrometers.
supplementary requirements that are indicated in the purchase
order. Failure to comply with the general requirements of
7. Chemical Composition
7.1 The steel shall conform to sulfur and phosphorus re-
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This specification is under the jurisdiction ofASTM Committee A01 on Steel,
quirements as prescribed in Table 1.
Stainless Steel and Related Alloysand is the direct responsibility of Subcommittee
A01.18 on Castings.
7.2 The content of carbon, manganese, silicon, and alloying
Current edition approved Sept. 1, 2015. Published September 2015. Originally
elementsmay,byagreement,beprescribedbythepurchaser.If
approved in 1955. Last previous edition approved in 2014 as A148/A148M–14.
not specified, the content may be selected by the manufacturer
DOI: 10.1520/A0148_A0148M-15.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or to obtain the required mechanical properties.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.3 Whentheanalysisofcarbon,manganese,silicon,orany
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. intentionally added alloying element is specifically requested
*A Summary of Changes section appears at the end of this standard
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A148/A148M−15
TABLE 1 Chemical Requirements
Grade (UNS No.) Composition, %
Sulfur, max Phospho-
rus, max
80-40 [550-275] (D50400) 0.06 0.05
80-50 [550-345] (D50500) 0.06 0.05
90-60 [620-415] (D50600) 0.06 0.05
105-85 [725-585] (D50850) 0.06 0.05
115-95 [795-655] (D50950) 0.06 0.05
130-115 [895-795] (D51150) 0.06 0.05
135-125 [930-860] (D51250) 0.06 0.05
150-135 [1035-930] (D51350) 0.06 0.05
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...