ASTM A148/A148M-20e1

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
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.
ε NOTE—“Yield point” was editorially changed to “yield strength” in 8.4 in May 2020.
1. Scope* A957/A957MSpecification for Investment Castings, Steel
andAlloy, Common Requirements, for General Industrial
1.1 This specification covers carbon steel, alloy steel, and
Use
martensitic stainless steel castings that are to be subjected to
A1067/A1067MSpecification for Test Coupons for Steel
higher mechanical stresses than those covered in Specification
Castings
A27/A27M.
E29Practice for Using Significant Digits in Test Data to
1.2 Several grades of steel castings are covered, having the
Determine Conformance with Specifications
chemical composition and mechanical properties prescribed in
Tables 1 and 2.
3. General Conditions for Delivery
1.3 The values stated in either SI units or inch-pound units
3.1 Except for castings produced by the investment casting
are to be regarded separately as standard. The values stated in
process, material furnished to this specification shall conform
each system may not be exact equivalents; therefore, each
to the requirements of Specification A781/A781M, including
system shall be used independently of the other. Combining
any supplementary requirements that are indicated in the
values from the two systems may result in nonconformance
purchase order. Failure to comply with the general require-
with the standard.
ments of Specification A781/A781M constitutes nonconfor-
1.3.1 Within the text, the SI units are shown in brackets.
mance with this specification. In case of conflict between the
1.4 This international standard was developed in accor-
requirements of this specification and Specification A781/
dance with internationally recognized principles on standard-
A781M, this specification shall prevail.
ization established in the Decision on Principles for the
3.2 Investment castings furnished to this specification shall
Development of International Standards, Guides and Recom-
conform to the requirements of Specification A957/A957M,
mendations issued by the World Trade Organization Technical
includinganysupplementaryrequirementsthatareindicatedin
Barriers to Trade (TBT) Committee.
the purchase order. Failure to comply with the general require-
ments of Specification A957/A957M constitutes nonconfor-
2. Referenced Documents
mance with this specification. In case of conflict between the
2.1 ASTM Standards:
requirements of this specification and Specification A957/
A27/A27MSpecification for Steel Castings, Carbon, for
A957M, Specification A957/A957M shall prevail.
General Application
A370Test Methods and Definitions for Mechanical Testing
4. Ordering Information
of Steel Products
A781/A781MSpecification for Castings, Steel and Alloy, 4.1 The inquiry and order should include or indicate the
following:
Common Requirements, for General Industrial Use
4.1.1 A description of the casting by pattern number or
drawing (dimensional tolerances shall be included on the
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
casting drawing),
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
A01.18 on Castings. 4.1.2 Grade of steel,
Current edition approved May 1, 2020. Published May 2020. Originally
4.1.3 Options in the specification, and
approved in 1955. Last previous edition approved in 2019 as A148/A148M–19.
DOI: 10.1520/A0148_A0148M-20E01. 4.1.4 The supplementary requirements desired, including
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the standards of acceptance.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1.5 Inthecaseofquenchandtemperedcastingstheruling
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. section, T.
*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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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
115-95 [795-655] (D50950) 0.05 0.06
130-115 [895-795] (D51150) 0.05 0.06
135-125 [930-860] (D51250) 0.05 0.06
150-135 [1035-930] (D51350) 0.05 0.06
160-145 [1105-1000] (D51450) 0.05 0.06
165-150 [1140-1035] (D51500) 0.020 0.020
165-150L [1140-1035L] (D51501) 0.020 0.020
210-180 [1450-1240] (D51800) 0.020 0.020
210-180L [1450-1240L] (D51801) 0.020 0.020
260-210 [1795-1450] (D52100) 0.020 0.020
260-210L [1795-1450L] (D52101) 0.020 0.020
A
All values are maximums.
A
TABLE 2 Tensile Requirements
Tensile strength, Yield Strength, Elongation in 2 in. or
Grade Reduction of Area, %
B
ksi [MPa] ksi [MPa] 50 mm, %
80-40 [550-275] 80 [550] 40 [275] 18 30
80-50 [550-345] 80 [550] 50 [345] 22 35
90-60 [620-415] 90 [620] 60 [415] 20 40
105-85 [725-585] 105 [725] 85 [585] 17 35
115-95 [795-655] 115 [795] 95 [655] 14 30
130-115 [895-795] 130 [895] 115 [795] 11 25
135-125 [930-860] 135 [930] 125 [860] 9 22
150-135 [1035-930] 150 [1035] 135 [930] 7 18
160-145 [1105-1000] 160 [1105] 145 [1000] 6 12
165-150 [1140-1035] 165 [1140] 150 [1035] 5 20
165-150L [1140-1035L] 165 [1140] 150 [1035] 5 20
210-180 [1450-1240] 210 [1450] 180 [1240] 4 15
210-180L [1450-1240L] 210 [1450] 180 [1240] 4 15
260-210 [1795-1450] 260 [1795] 210 [1450] 3 6
260-210L [1795-1450L] 260 [1795] 210 [1450] 3 6
A
All values are minimums.
B
Determine by the 0.2 % offset method.
5. Heat Treatment 7.3 Whentheanalysisofcarbon,manganese,silicon,orany
intentionally added alloying element is specifically requested
5.1 All castings shall be heat treated either by annealing,
in the contract or order, it shall be made by the manufacturer
normalizing, normalizing and tempering, or quenching and
and reported to the purchaser. The results of these analyses
tempering. Unless otherwise specified in the inquiry, contract,
shall not be used as a basis for rejection except by prior
or order, the castings may be heat treated by any of these heat
agreement.
treatmentsorcombinationoftheseheattreatmentsattheoption
of the manufacturer.
8. Tension Testing Requirements
5.2 Heat treatment shall be performed after the castings
have been allowed to cool below the transformation range.
8.1 One tension test shall be made from each heat, for
investmentcastings,eachmasterheat,andshallconformtothe
6. Temperature Control
tensile requirements specified in Table 2.
6.1 Furnacetemperaturesforheattreatingshallberegulated
8.2 The test coupons and specimens shall conform to
by the use of pyrometers.
requirements specified in Section 11.
7. Chemical Composition
8.3 Tension test coupons shall be machined to the form and
7.1 The steel shall conform to sulfur and phosphorus re-
dimension shown in Fig. 4 of Test Methods and Definitions
quirements as prescribed in Table 1.
A370andtestedinaccordancewiththosetestmethodswiththe
ends machined to fit the grips on the tensile testing machine to
7.2 The content of carbon, manganese, silicon, and alloying
be used. Suggested types of ends for standard round tension
elementsmay,byagreement,beprescribedbythepurchaser.If
test specimens are shown in Fig. 5 of Test Methods and
not specified, the content may be selected by the manufacturer
to obtain the required mechanical properties. Definitions A370.
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A148/A148M−20
8.4 To determine conformance with the tension test casting’s thickness, T, in A781/A781M, S15.2 equal to the
requirements, an observed value or calculated value shall be ruling section, T, from 4.1.5. For investment castin
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