Electric Resistance Welded Steel Pipe Usage:Used for low pressure liquid delivery, such as water, gas, and oil. Oil drilling and machinery manufacturing, etc. ERW: Electric Resistance Welded pipe HFI :High Frequency Induction weld pipe EFW :Electric Fusion Welded Pipe Standard :API 5L, API 5CT, ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387 Certificate :API 5L PSL1/ PSL2, API 5CT Out Diameter :21.3mm - 610mm Wall Thickness :1.8 - 22mm Length :0.3 ¡¡ìC 12m Steel Grade :API 5L : GR B, X42, X46, X56, X60, X65, X70 ASTM A53 : GR A, GR B, GR C EN : S275, S275JR, S355JRH, S355J2H