Cold rolled galvanized steel pipe 1)Thickness:1.0-6.5mm 2)OD:20-168mm 3)Certification:ISO9001:20 GB/T3091galvanized steel pipe Details1.Product ... , d. Cutting head, e. Pickling, f. Grinding, g.Lubrication, h. Cold rolling, i. Degreasing, j. Solution heat treatment, k. Straightening, l ... 4 10.851255140 4 13.421506165 4.5 17.81 Cold rolled galvanized steel pipe