Civil Engineering Association

M 270M/M 270-23: Standard Specification for Structural Steel for Bridges

This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars and quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. Eight grades are available in four yield strength levels.

Grades 250 [36], 345 [50], 345S [50S], 345W [50W], and 345CR [50CR] are also included in ASTM A36/A36M, A572/A572M, A992/A992M, A588/A588M, A514/A514M, and A1010/A1010. When the supplementary requirements of this specification are specified, they exceed the requirements of A36/A36M, A572/A572M, A992/A992M, A588/A588M, A514/A514M, and A1010/A1010M.

Grades 345W [50W], 345CR [50CR], HPS 345W [HPS 50W], HPS 485W [HPS 70W], and HPS 690W [HPS 100W] have enhanced atmospheric corrosion resistance.

Grade HPS 485W [HPS 70W] or HPS 690W [HPS 100W] shall not be substituted for Grade 250 [36], 345 [50], 345S [50S], 345W [50W], 345CR [50CR], or HPS 345W [HPS 50W]. Grade 345W [50W], 345CR [50CR], or HPS 345W [HPS 50W] shall not be substituted for Grade 250 [36], 345 [50], or 345S [50S] without agreement between the purchaser and supplier.

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 ASTM A6/A6M for information on weldability.

For structural products to be used as tension components requiring notch toughness testing, standardized requirements are provided in this standard. These requirements are based on AASHTO requirements for both fracture-critical and non-fracture-critical members.

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