... -220mm Standard: GB, BS, ASTM A53-2007, AP spiral welded steel tube1. Out Diameter: 20mm - 220mm2. Thickness: 0.8mm ... ASTM, BS, GB/T9711.1-1997 Low pressure liquid pipe:1) Nominal OD: 21.3 - 194mm (1/2" ... , ASTM A-53, GB/T3091-2001 other standard pipe, complete product specifications.Exports to Europe, North America, ... customer demand production of special specification pipe. spiral welded steel tube