... -114.3mm 3)Application:Structure 4)Certification:ISO9001:2000 Hot-dip Galvanized steel pipe 1)Thickness:2.77-6.02mm 2)OD ... :Structure 4)Certification:ISO9001:20001)Product Name:ASTM A53 Hot-dip Galvanized steel pipe2)Place of Origin:Nantong China(Mainland)3)OD ... , d. Cutting head, e. Pickling, f. Grinding, g. Lubrication, h. Cold rolling, i. Degreasing, j. Solution heat treatment, k. Straightening, l ...