Hebei haiqianwei steel pipe co.,ltd OD:16-56inch Metarial:X42- ... , ASTM, API Enclosed the products about Hebei haiqianwei steel pipe co.,ltd The equipment of Hebei haiqianwei steel pipe co.,ltd Production ... → Ultrosonic Test → X-ray Test → Appearance Inspection → CoatingThe Process of Hebei haiqianwei steel pipe co.,ltd The Certificate of ...