welded pipe 1.PROFESSIONAL MANUFACTURE 2. ASTM ,GB ,JIS ,Q235,SS400 . 3.HIGH QUALITY AND COMPETITIVE PRICE 4.GOOD SERVICE ... customer’s requiremntsInternatioanal StandardISO 9000-2001StandardsASTMA53,BS1387-1985,GB/T3091-2001,EN39,BS1139MaterialsQ195,Q215,Q235,Q345Product CategoryMetallurgy,Mineral &EnergyTechniqueWeldedPacking1.Big OD:in ...