ASTM A572 Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel.ASTM A572 specifiation covers the standard requirements for Grades 42 [290], 50 [345], 55 [380], 60 [415], and 65 [450] of high-strength low-alloy columbium-vanadium structural steel shapes, plates, sheet piling, and bars for applications in bolted, welded, and riveted structures in bridges and buildings.ASTM A572Standard main steel grade:A572GR.42,A572GR.50.