ERW (Electric Resistance Welded) steel pipe HFI (High Frequency Induction weld pipe) Size: Outer Diameter: 21.3 - 610mm Wall Thickness: 1.8 - 22mm Length:5.8 to 12 meters Quality standard: API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387 Steel Grade: API 5L : GR B, X42, X46, X56, X60, X65, X70 ASTM A53: GR A, GR B, GR CEN: S275, S275JR, S355JRH, S355J2H GB: Q195, Q215, Q235, ...