... -304.8mm 4.Standard: GB, BS, ASTM A53-2007, API5L ERW Welded Steel Pipe1. Out Diameter: 25.4mm - 304.8mm2. Thickness ... Finish: Galvanized, electro galvanized, black1)Weld form: Longitudinal 2)Technology: ERW 3)Application: FluidQuality standard: API 5L Gas and petroleum pipelines ... , Elongation), Technical Properties ( Bending Test, Blow Test, Impact Test), Exterior ERW Welded Steel Pipe