ASTM A572, specification for High-strength low-alloy Columbium-Vanadium structural steel plate. This specification covers 5 grades and 4 types of high strength low alloy structural steel shapes, plates, piling, bars. Grade 42, 50, 55, 60, 65 and type 1, 2,2 3, 5. Low alloy and high strength structural steel plate is widely used in engineering structure applications, such as building structure, construction machinery, mine machinery, truck, bridge, pressure vessel, etc.