Hot dipped galvanized pipe Surface finish:Hot dipped galvanized Standard:GB/T3091-2001,BS138 Out Diameter: 10.3mm - 406.4mmThickness: 0.6mm – 20 ... -Q345, S235JR, S275JR, S355JR, Gr. B-DStandard: GB/T 3091-2001, BS1387-1985, DIN EN10025, EN10219, ASTM SCH40, ASTM SCH80\Surface ...