... A53 GR.BDINDIN17175 ST33DIN1629 ST52/ST52-4JISSTKR490 SS400ApplicationOil drilling,boiler,precision machines ,petroleum,Chemical,structure pipe,fluid pipe,linepipe etcPackagingExpor packaging ... the products about Hebei haiqianwei steel pipe co.,ltd The equipment of Hebei haiqianwei steel pipe co.,ltd Production Process:Plate Ultrosonic Inspection → Plate ...