galvanized steel pipe OD:15mm*15mm-400*400mm Thickness:0.5mm to 25mm Steel tube manufacturer Goup12Cr2Mo, 15MnV, Q235, Q34 Specifications galvanized steel pipe OD:15mm*15mm-400*400mm Thickness:0.5mm to 25mm Steel tube manufacturer Goup Welded Round Steel Pipe (galvanized)Quick Details Standard: BS, GB, ASTMStandard: BS 1387, GB/T 3091-2001, ASTM A53-200... Grade: A53-A369, Q195-Q345Grade: A53(A,B ...