... Cold rolled galvanized steel pipe 1)Thickness:1.0-6.5mm 2)OD:20-168mm 3)Certification:ISO9001:20 GB/T3091galvanized steel pipe ... Cutting head, e. Pickling, f. Grinding, g.Lubrication, h. Cold rolling, i. Degreasing, j. Solution heat treatment, k. Straightening, ... Inspection 12.Application:Water pipes, fire control, gas pipes, air pipes, sewage transport and water supply projects13.Export: Europe, ...