ASTM A709/A709M Standard Specification for Structural Steel for Bridges.

ASTM A709/A709M Standard Specification for Structural Steel for Bridges. ASTM A709/A709M 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.
A709 gr 50 has high strength, even at very low temperatures, it can still maintain the mechanical a709 steel properties of the steel plate itself. Good fatigue resistance; high toughness and low brittle transition temperature; good cold forming performance and welding performance; good corrosion performance and certain wear resistance.