... ST33DIN1629 ST52/ST52-4JISSTKR490 SS400ApplicationOil drilling,boiler,precision machines ,petroleum,Chemical,structure pipe,fluid pipe,linepipe etcPackagingExpor packaging :in bundles,Painting ,Beveled edges ... ,ISO9001,StandardJIS, GB, DIN, ASTM, API Enclosed some pictures about API steel pipe company The equipment of API steel pipe company Production Process:Plate Ultrosonic ...