American Society for Testing and Materials Standard - Structural Steel for Bridges

 

ASTM A709/A709M-07

 

Replacing ASTM A709/A709M-05

Scope

1.1 This standard applies to carbon steel and high-strength low-alloy structural shapes, plates, and bars for bridges, as well as quenched and tempered alloy structural steel plates. Among the nine available grades, there are four 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)
50W (345W)	50 (345)
HPS 50W (HPS 345W)	50 (345)
HPS 70W (HPS 485W)	70 (485)
100 (690)	100 (690)
100W (690W)	100 (690)
HPS 100W (HPS 690W)	100 (690)

 

1.1.1 Grades 36 (250), 50 (345), 50S (345S), 50W (345W), 100 (690), and 100W (690W) are also included in A36/A36M, A572/A572M, A992/A992M, A588/A588M, and A514/A514M, respectively. When the supplementary requirements of this standard are specified, these steels exceed the requirements of standards A36/A36M, A572/A572M, A992/A992M, A588/A588M, and A514/A514M.

 

1.1.2 Grades 50W (345W), HPS 50W (HPS 345W), HPS 70W (HPS 485W), 100W (690W), and HPS 100W (HPS 690W) have enhanced atmospheric corrosion resistance (see 14.1.2). The availability of products is shown in Table 1.

 

 

1.2 Grades HPS 70W (HPS 485W), 100 (690), 100W (690W), or HPS 100W (HPS 690W) shall not be substituted for grades 36 (250), 50 (345), 50S (345S), 50W (345W), or HPS 50W (HPS 345W). Grades 50W (345W) or HPS 50W (HPS 345W) shall not be substituted for grades 36 (250), 50 (345), or 50S (345S) without mutual agreement between the supplier and the purchaser.

 

1.3 When the steel is to be welded, it is prerequisite that a welding procedure suitable for the grade of steel and the intended or service use be employed. See Appendix X3 of this standard, A6/A6M, for weldability information.

 

 

 

 

 

 

 

 

 

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