... & Certification1Certification: ISO, API, ASTM, DIN etc2 Mill Test Certificate: EN10204/3.1B3Third party inspection: SGS, BV, ... checks for customers4Always cooperate with china large steel pipe and pipe fittings enterprises, choose large and superior manufacturer ... steel pipe market. Steel pipe: Seamlesssteel pipe, Erw/Lsaw welded steel pipe, Ssaw/Spiral welded steel pipe, Hot galvanized steel pipe , ...