Galvanized Welded Steel Pipe 1.Technique: GI 2 ... 4.Standard: GB, BS, ASTM A53-2007, API5L Galvanized Welded Steel Pipe1. Out Diameter: 25.4mm - 304.8mm2. ... EN10025, EN10219, ASTM SCH40, ASTMSCH804. Surface Finish: Galvanized, electro galvanized, black1)Weld form: Longitudinal 2)Technology: ERW 3 ... inside coated with cement mortar. Steel pipes are welded from outside after erectioning.Flanged joint: The ...