... ST52-4JISSTKR490 SS400ApplicationOil drilling,boiler,precision machines ,petroleum,Chemical,structure pipe,fluid pipe,linepipe etcPackagingExpor packaging :in bundles,Painting ,Beveled edges, ... Test → Pipe Ends Beveling → Ultrosonic Test → X-ray Test → Appearance Inspection → CoatingThe Process of Steel pipe welding company The Certificate of Steel pipe welding company Steel pipe welding company