ASTM A709/A709M-21

Standard Specification for Structural Steel for Bridges

ABSTRACT
This specification covers carbon and high-strength low alloy steel structural shapes, plates and bars, and quenched and tempered alloy steel for structural plates intended for use in bridges. Heat analysis shall be used to determine the percentage of carbon, manganese, phosphorus, sulfur, silicon, and copper for the required chemical composition. A tension test shall be used to determine the required tensile properties such as tensile strength, yield strength, and elongation. Materials shall undergo: (1) an impact test for non-fracture critical and fracture critical members; and (2) a Brinell hardness test for Grades 100 and 100W. Atmospheric corrosion resistance shall also be determined.
SCOPE
1.1 This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. Twelve grades are available in five yield strength levels as follows:    
Grade U.S. [SI]  
Yield Strength, ksi [MPa]    
36 [250]  
36 [250]    
50 [345]  
50 [345]    
50S [345S]  
50 [345]    
QST 50 [QST 345]  
50 [345]    
QST 50S [QST 345S]  
50 [345]    
50W [345W]  
50 [345]    
HPS 50W [HPS 345W]  
50 [345]    
50CR [345CR]  
50 [345]    
QST 65 [QST450]  
65 [450]    
QST 70 [QST485]  
70 [485]    
HPS 70W [HPS 485W]  
70 [485]    
HPS 100W [HPS 690W]  
100 [690]  
1.1.1 Grades 36 [250], 50 [345], 50S [345S], 50W [345W], 50CR [345CR], QST 50 [QST 345], QST 50S [QST 345S], QST 65 [QST 450], and QST 70 [QST 485] are also included in Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M, A1010/A1010M (UNS S41003), and A913/A913M respectively. When the requirements of Table 11 or Table 12 or the supplementary requirements of this specification are specified, they exceed the requirements of Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M, A1010/A1010M (UNS S41003), and A913/A913M. Product availability is shown in Table 1.    
1.1.2 Grades 50W [345W], 50CR [345CR], HPS 50W [HPS 345W], HPS 70W [HPS 485W], and HPS 100W [HPS 690W] have enhanced atmospheric corrosion resistance (see 13.1.2). Product availability is shown in Table 1.            
1.2 Grade HPS 70W [HPS 485W] or HPS 100W [HPS 690W] shall not be substituted for Grades 36 [250], 50 [345], 50S [345S], 50W [345W], or HPS 50W [HPS 345W]. Grade 50W [345W], or HPS 50W [HPS 345W] shall not be substituted for Grades 36 [250], 50 [345] or 50S [345S] without agreement between the purchaser and the supplier.  
1.3 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.  
1.4 For structural products to be used as tension components requiring notch toughness testing, standardized requirements are provided in this standard, and they are based upon American Association of State Highway and Transportation Officials (AASHTO) requirements for both fracture critical and non-fracture critical members.  
1.5 Supplementary requirements are available but shall apply only if specified in the purchase order.  
1.6 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.  
1.7 For structural products produced from coil and furnished without heat treatment or with stress relieving only, the additional requirements, including additional testing requirements and the reporting of additional test results, of Specification A6/A6M apply.  
1.8 This international standard was developed in accordance with internationally recognized principles on standardizati...

General Information

• Status: Published
• Publication Date: 31-Oct-2021
• ICS: 77.140.10 - Heat-treatable steels
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.02 - Structural Steel for Bridges, Buildings, Rolling Stock and Ships

Standards Content (Sample)

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:A709/A709M −21
Standard Specification for
1
Structural Steel for Bridges
This standard is issued under the fixed designationA709/A709M; 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* tuted for Grades 36 [250], 50 [345] or 50S [345S] without
agreement between the purchaser and the supplier.
1.1 This specification covers carbon and high-strength low-
1.3 When the steel is to be welded, it is presupposed that a
alloy steel structural shapes, plates, and bars, quenched and
welding procedure suitable for the grade of steel and intended
tempered alloy steel, and stainless steel for structural plates
use or service will be utilized. See Appendix X3 of Specifica-
intended for use in bridges. Twelve grades are available in five
tion A6/A6M for information on weldability.
yield strength levels as follows:
Grade U.S. [SI] Yield Strength, ksi [MPa]
1.4 Forstructuralproductstobeusedastensioncomponents
requiring notch toughness testing, standardized requirements
36 [250] 36 [250]
are provided in this standard, and they are based upon
50 [345] 50 [345]
50S [345S] 50 [345]
American Association of State Highway and Transportation
QST 50 [QST 345] 50 [345]
Officials(AASHTO)requirementsforbothfracturecriticaland
QST 50S [QST 345S] 50 [345]
non-fracture critical members.
50W [345W] 50 [345]
HPS 50W [HPS 345W] 50 [345]
1.5 Supplementary requirements are available but shall
50CR [345CR] 50 [345]
QST 65 [QST450] 65 [450] apply only if specified in the purchase order.
QST 70 [QST485] 70 [485]
1.6 The values stated in either SI units or inch-pound units
HPS 70W [HPS 485W] 70 [485]
HPS 100W [HPS 690W] 100 [690]
are to be regarded separately as standard. The values stated in
each system may not be exact equivalents; therefore, each
1.1.1 Grades 36 [250], 50 [345], 50S [345S], 50W [345W],
system shall be used independently of the other. Combining
50CR [345CR], QST 50 [QST 345], QST 50S [QST 345S],
values from the two systems may result in non-conformance
QST 65 [QST 450], and QST 70 [QST 485] are also included
with the standard.
in Specifications A36/A36M, A572/A572M, A992/A992M,
A588/A588M, A1010/A1010M (UNS S41003), and A913/
1.7 For structural products produced from coil and fur-
A913M respectively. When the requirements of Table 11 or
nished without heat treatment or with stress relieving only, the
Table 12 or the supplementary requirements of this specifica-
additional requirements, including additional testing require-
tion are specified, they exceed the requirements of Specifica-
ments and the reporting of additional test results, of Specifi-
tions A36/A36M, A572/A572M, A992/A992M, A588/
cation A6/A6M apply.
A588M, A1010/A1010M (UNS S41003), and A913/A913M.
1.8 This international standard was developed in accor-
Product availability is shown in Table 1.
dance with internationally recognized principles on standard-
1.1.2 Grades50W[345W],50CR[345CR],HPS50W[HPS
ization established in the Decision on Principles for the
345W], HPS 70W [HPS 485W], and HPS 100W [HPS 690W]
Development of International Standards, Guides and Recom-
have enhanced atmospheric corrosion resistance (see 13.1.2).
mendations issued by the World Trade Organization Technical
Product availability is shown in Table 1.
Barriers to Trade (TBT) Committee.
1.2 Grade HPS 70W [HPS 485W] or HPS 100W [HPS
2. Referenced Documents
690W] shall not be substituted for Grades 36 [250], 50 [345],
2
50S [345S], 50W [345W], or HPS 50W [HPS 345W]. Grade
2.1 ASTM Standards:
50W [345W], or HPS 50W [HPS 345W] shall not be substi-
A6/A6M Specification for General Requirements for Rolled
Structural Steel Bars, Plates, Shapes, and Sheet Piling
A36/A36M Specification for Carbon Structural Steel
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 Nov. 1, 2021. Published November 2021. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1974. Last previous edition approved in 2018 as A709/A709M – 18. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0709_A0709M-21. the ASTM website.
*A Summary of Changes section appears at the end of this standard
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...

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: A709/A709M − 18 A709/A709M − 21
Standard Specification for
1
Structural Steel for Bridges
This standard is issued under the fixed designation A709/A709M; 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 high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered
alloy steel, and stainless steel for structural plates intended for use in bridges. Twelve grades are available in five yield strength
levels as follows:
Grade U.S. [SI] Yield Strength, ksi [MPa]
36 [250] 36 [250]
50 [345] 50 [345]
50S [345S] 50 [345]
QST 50 [QST 345] 50 [345]
QST 50S [QST 345S] 50 [345]
50W [345W] 50 [345]
HPS 50W [HPS 345W] 50 [345]
50CR [345CR] 50 [345]
QST 65 [QST450] 65 [450]
QST 70 [QST485] 70 [485]
HPS 70W [HPS 485W] 70 [485]
HPS 100W [HPS 690W] 100 [690]
1.1.1 Grades 36 [250], 50 [345], 50S [345S], 50W [345W], 50CR [345CR], QST 50 [QST 345], QST 50S [QST 345S], QST 65
[QST 450], and QST 70 [QST 485] are also included in Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M,
A1010/A1010M (UNS S41003), and A913/A913M respectively. When the requirements of Table 11 or Table 12 or the
supplementary requirements of this specification are specified, they exceed the requirements of Specifications A36/A36M,
A572/A572M, A992/A992M, A588/A588M, A1010/A1010M (UNS S41003), and A913/A913M. Product availability is shown in
Table 1.
1.1.2 Grades 50W [345W], 50CR [345CR], HPS 50W [HPS 345W], HPS 70W [HPS 485W], and HPS 100W [HPS 690W] have
enhanced atmospheric corrosion resistance (see 13.1.2). Product availability is shown in Table 1.
1.2 Grade HPS 70W [HPS 485W] or HPS 100W [HPS 690W] shall not be substituted for Grades 36 [250], 50 [345], 50S [345S],
50W [345W], or HPS 50W [HPS 345W]. Grade 50W [345W], or HPS 50W [HPS 345W] shall not be substituted for Grades 36
[250], 50 [345] or 50S [345S] without agreement between the purchaser and the supplier.
1.3 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
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 Nov. 15, 2018Nov. 1, 2021. Published December 2018November 2021. Originally approved in 1974. Last previous edition approved in 20172018
ɛ1
as A709/A709M – 17A709/A709M – 18. . DOI: 10.1520/A0709_A0709M-18.10.1520/A0709_A0709M-21.
*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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A709/A709M − 21
A
TABLE 1 Tensile and Hardness Requirements
NOTE 1—Where “. . .” appears in this table, there is no requirement.
Minimum Elongation, %
Yield Point or
C,
Structural Shape Plates and Bars Reduction of
E
Plate Thickness, in. Tensile Strength, Shapes
Yield E
C,D
Grade Flange or Leg
Area
B
[mm] ksi [MPa]
Strength, ksi
min, %
Thickness, in. [mm]
8 in. or 2 in. or 8 in. or 2 in. or
[MPa]
200 mm 50 mm 200 mm 50 mm
36 [250] to 4 [100], incl to 3 in. [75 mm], 36 [250] min 58–80 [400–550] 20 23 20 21 .
incl
over 3 in. [75 mm] 36 [250] min 58 [400] min . . 20 19 .
F
50 [345] to 4 [100], incl all 50 [345] min 65 [450] min 18 21 18 21 .
G F
QST 50 [QST 345] all 50 [345] min 65 [450] min . . 18 21 .
G H
50S [345S] all 50–65 65 [450] min . . 18 21 .
H,I
[345–450]
G
QST 50S [QST all 50–65 65 [450] min . . 18 21 .
345S [345–450]
J
50W [345W] to 4 [100], incl all 50 [345] min 70 [485] min 18 21 18 21 .
and
HPS 50W
[HPS 345W]
G
50CR [345CR] to 2 [50], incl 50 [345] min 70 [485] min 18 21 . . .
G
QST 65 [QST 450] all 65 [450] min 80 [550] min . . 15 17 .
G
QST 70 [QST 485] all 70 [485] min 90 [620] min . . 14 16 .
G B K
HPS 70W to 4 [100], incl 70 [485] min 85–110 [585–760] . 19 . . .
[HPS 485 W]
G B K L
1
HPS 100W to 2 ⁄2 [65], incl 100 [690] min 110–130 . 18 . .
[HPS 690W] [760–895]
G B K L
1
over 2 ⁄2 to 4 90 [620] mi
...