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ASTM A709/A709M-26

Standard Specification for Structural Steel for Bridges
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ASTM A709/A709M-26

Standard Specification for Structural Steel for Bridges

PUBLISH DATE 2026
PAGES 9
ASTM A709/A709M-26

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.

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 [

SDO ASTM: ASTM International
Document Number A709
Publication Date April 1, 2026
Language en - English
Page Count 9
Revision Level 26
Supercedes
Committee A01.02
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