Electric Resistance Welded Steel Pipe Usage:Used for low pressure liquid delivery, such as water, ... , etc. ERW :Electric Resistance Welded pipe HFI:High Frequency Induction weld pipe EFW:Electric Fusion Welded Pipe Standard:API 5L, API 5CT, ASTM ... - 610mm Wall Thickness:1.8 - 22mm Length:0.3 – 12m Steel Grade:API 5L : GR B, X42, X46, X56, X60, X65 ...