ASTM A572/A572M-15 pdf free.Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel. This specification covers five grades of high-strength low-alloy structural steel shapes, plates, sheet piling, and bars. Grades 42 , 50 , and 55 are intended for riveted, bolted, or welded structures. Grades 60 and 65 are intended for riveted or bolted construction of bridges, or for riveted, bolted, or...