ASTM A913/A913M-19
(Specification)Standard Specification for High-Strength Low-Alloy Steel Shapes of Structural Quality, Produced by Quenching and Self-Tempering Process (QST)
Standard Specification for High-Strength Low-Alloy Steel Shapes of Structural Quality, Produced by Quenching and Self-Tempering Process (QST)
ABSTRACT
This specification covers high-strength low-alloy steel shapes of structural quality, produced by quenching and self-tempering process (QST). The chemical analysis of the heat and of the steel product analysis shall conform to the chemical requirements prescribed by the reference materials. The Charpy V-notch test shall be performed to determine if the material conforms to the required tensile properties.
SCOPE
1.1 This specification covers high-strength low-alloy structural steel shapes in Grades 50 [345], 60 [415], 65 [450], 70 [485], and 80 [550], produced by the quenching and self-tempering process (QST). The shapes are intended for riveted, bolted or welded construction of bridges, buildings and other structures.
1.2 The QST process consists of in line heat treatment and cooling rate controls which result in mechanical properties in the finished condition that are equivalent to those attained using heat treating processes which entail reheating after rolling. A description of the QST process is given in Appendix X1.
1.3 Due to the inherent characteristics of the QST process, Grade 50 [345], 60 [415], 65 [450], and 70 [485] shapes shall not be formed nor post weld heat treated at temperatures exceeding 1100°F [595°C] and Grade 80 [550] shapes shall not be formed nor post weld heat treated at temperatures exceeding 1000°F [540°C].
1.4 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use or service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
1.6 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:A913/A913M −19
Standard Specification for
High-Strength Low-Alloy Steel Shapes of Structural Quality,
1
Produced by Quenching and Self-Tempering Process (QST)
This standard is issued under the fixed designationA913/A913M; 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* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers high-strength low-alloy struc-
tural steel shapes in Grades 50 [345], 60 [415], 65 [450], 70
2. Referenced Documents
[485], and 80 [550], produced by the quenching and self-
2
2.1 ASTM Standards:
tempering process (QST). The shapes are intended for riveted,
A6/A6M Specification for General Requirements for Rolled
bolted or welded construction of bridges, buildings and other
Structural Steel Bars, Plates, Shapes, and Sheet Piling
structures.
A673/A673M Specification for Sampling Procedure for Im-
1.2 The QST process consists of in line heat treatment and
pact Testing of Structural Steel
cooling rate controls which result in mechanical properties in
A898/A898M Specification for Straight Beam Ultrasonic
the finished condition that are equivalent to those attained
Examination of Rolled Steel Structural Shapes
using heat treating processes which entail reheating after
rolling.Adescription of the QST process is given in Appendix
3. General Requirements for Delivery
X1.
3.1 Material furnished under this specification shall con-
1.3 Due to the inherent characteristics of the QST process,
form to the applicable requirements of the current edition of
Grade 50 [345], 60 [415], 65 [450], and 70 [485] shapes shall
Specification A6/A6M.
not be formed nor post weld heat treated at temperatures
4. Materials and Manufacture
exceeding1100°F[595°C]andGrade80[550]shapesshallnot
beformednorpostweldheattreatedattemperaturesexceeding
4.1 The shapes shall be produced by the quenching and
1000°F [540°C].
self-tempering process (QST). Following rapid quenching to
achieve a surface temperature below the martensite start
1.4 When the steel is to be welded, it is presupposed that a
temperature, Ms, the shapes shall be allowed to auto-temper to
welding procedure suitable for the grade of steel and intended
a self-tempering temperature (STT) that shall be 1100°F
use or service will be utilized. See Appendix X3 of Specifica-
[595°C] minimum and 1300°F [705°C] maximum for Grades
tion A6/A6M for information on weldability.
50[345],60[415],65[450],and70[485];and1000°F[540°C]
1.5 The values stated in either inch-pound units or SI units
minimum and 1250°F [680°C] maximum for Grade 80 [550].
are to be regarded separately as standard. Within the text, the
The STT shall be reported on the mill test report.
SI units are shown in brackets. The values stated in each
4.2 For Grades 60 [415], 65 [450], 70 [485], and 80 [550],
system are not exact equivalents; therefore, each system must
the requirements for fine austenitic grain size in Specification
be used independently of the other. Combining values from the
A6/A6M shall be met.
two systems may result in nonconformance with this specifi-
cation.
5. Chemical Composition
1.6 This international standard was developed in accor-
5.1 The chemical analysis of the heat shall conform to the
dance with internationally recognized principles on standard-
requirements prescribed in Table 1.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.2 The steel shall conform on product analysis to the
requirements prescribed in Table 1 subject to the product
analysis tolerances in Specification A6/A6M.
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
2
A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 1, 2019. Published September 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1993. Last previous edition approved in 2015 as A913/A913M – 15. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0913_A0913M-19. 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 Co
...
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: A913/A913M − 15 A913/A913M − 19
Standard Specification for
High-Strength Low-Alloy Steel Shapes of Structural Quality,
1
Produced by Quenching and Self-Tempering Process (QST)
This standard is issued under the fixed designation A913/A913M; 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 high-strength low-alloy structural steel shapes in Grades 50 [345], 60 [415], 65 [450] and [450],
70 [485], and 80 [550], produced by the quenching and self-tempering process (QST). The shapes are intended for riveted, bolted
or welded construction of bridges, buildings and other structures.
1.2 The QST process consists of in line heat treatment and cooling rate controls which result in mechanical properties in the
finished condition that are equivalent to those attained using heat treating processes which entail reheating after rolling. A
description of the QST process is given in Appendix X1.
1.3 Due to the inherent characteristics of the QST process, the Grade 50 [345], 60 [415], 65 [450], and 70 [485] shapes shall
not be formed andnor post weld heat treated at temperatures exceeding 1100°F [600°C].[595°C] and Grade 80 [550] shapes shall
not be formed nor post weld heat treated at temperatures exceeding 1000°F [540°C].
1.4 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended use
or service will be utilized. See Appendix X3 of Specification A6/A6M for information on weldability.
1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units
are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used
independently of the other. Combining values from the two systems may result in nonconformance with this specification.
1.6 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:
A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling
A673/A673M Specification for Sampling Procedure for Impact Testing of Structural Steel
A898/A898M Specification for Straight Beam Ultrasonic Examination of Rolled Steel Structural Shapes
3. General Requirements for Delivery
3.1 Material furnished under this specification shall conform to the applicable requirements of the current edition of
Specification A6/A6M.
4. Materials and Manufacture
4.1 The shapes shall be produced by the quenching and self-tempering process (QST). Following rapid quenching to achieve
a surface temperature below the martensite start temperature, Ms, the shapes shall be allowed to auto-temper to a self-tempering
temperature (STT) that shall be 1100°F [595°C] minimum and 1300°F [705°C] maximum. maximum for Grades 50 [345], 60
[415], 65 [450], and 70 [485]; and 1000°F [540°C] minimum and 1250°F [680°C] maximum for Grade 80 [550]. The STT shall
be reported on the mill test report.
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 A01.02
on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.
Current edition approved July 1, 2015Sept. 1, 2019. Published August 2015September 2019. Originally approved in 1993. Last previous edition approved in 20142015
as A913/A913M – 14a.A913/A913M – 15. DOI: 10.1520/A0913_A0913M-15.10.1520/A0913_A0913M-19.
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’sstandard’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
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A913/A913M − 19
4.2 For gradesGrades 60 [415], 65
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