... hot-rolled, cold-rolled, cold-drawn Surface treatmentgalvanizedgalvanizes steel pipe:OD20mm-219mmStandardASTM A53A, BS1387-1985,GB/T3091-2001Spec ... Q235 Q345packing:in bundlegalvanized steel pipemainly trades in all kinds of welded Steel Pipes and Tubes such as OCTG, ... , Square & Rectangular Tubes, Conduit Pipes, Stainless and Relevant Pipe Fittings and Valves under world standard of ASTM / ASME, ...