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ERW steel pipe is a "high-frequency resistance welded steel pipe", which is different from the welding process of ordinary welded pipe. The weld is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of general welded pipe.
ERW stands for resistance welding. Resistance welding has the characteristics of high production efficiency, low cost, material saving, and easy automation. Therefore, it is widely used in aviation, aerospace, energy, electronics, automotive, light industry and other industrial sectors. It is one of the important welding processes.
Conclusion: modern ERW-HFI welded pipes are absolutely a valid alternative to seamless pipes and help end-users reduce prices and lead times between 20 and 25%.
Pipes are, with valve, the most impactful piping cost element in plant construction (as a rule of thumb, piping covers 5-7% of the total plant cost, and pipes represent circa 60 to 70% of this cost, valves 15 to 25%). These figures are average values that refer to the oil & gas industry and refer to carbon steel materials (theweight of piping may be higher for stainless steel, duplex, and nickel-alloys piping classes).