... ASTM A53TechniqueWelded, hot-rolled, cold-rolled, cold-drawn Surface treatmentgalvanizedgalvanizes steel pipe:OD20mm-219mmStandardASTM A53A, BS1387-1985,GB/T3091-2001Spec.Q195 ... Q215 Q235 Q345packing:in bundlegalvanized steel pipemainly trades in all kinds of welded Steel Pipes and Tubes such as OCTG ...