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a572 steel grade 50 steel pipe steel plate ASTM A572 Grade 50 Pipe HYSP Steel Pipe Supplier. ASTM A572 Grade 50 Pipe. As you know, ASTM A572 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.Get Price