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Description

ERW Steel Pipe (ELECTRIC RESISTANCE WELDING)

ERW Steel Pipe (ELECTRIC RESISTANCE WELDING)
ERW Steel Pipes are manufactured using steel coils: the coil is first uncoiled, then smoothed, cut and, finally formed into a pipe shape by joining its two extremities electrically.
ERW Steel Pipes are available in sizes between 1/2 and 20 inches, in carbon steel (ASTM A53 is the most common specification) and stainless steel (ASTM A312). In terms of dimensions, the ASME B36.10 and ASME B36.19 are the key reference specifications (API 5L for welded ERW line pipes).
The ASME and API dimensional charts show typical combinations of pipe nominal size and wall thickness (designated as "schedule"), and show ERW Steel Pipe weight in kg (or pounds).

In the last few years, ERW Steel Pipes are have become an efficient alternative to seamless pipes, both in terms of price and performance, due to the modern welding technologies adopted by ERW Steel Pipe manufacturers (example HFI and HFW, high-frequency welding). These advancements in welding technologies have reduced, over time, the technical superiority of seamless pipes vs ERW Steel Pipes, making them interchangeable at least in some applications (low/medium pressure and temperature). Of course, seamless pipes will always benefit from the intrinsic superior mechanical strength of steel billets vs. coils and plates.



ERW Steel Pipe
ERW Steel Pipe MANUFACTURING PROCESS
ERW Steel Pipes are manufactured starting from steel coils, that are at first uncoiled, cut, processed, welded and tested as shown in the picture below.
The most common welding technique used for oil and gas pipes is the so-called "high-frequency induction technology" (ERW-HFI), consisting in the application of an induction current on the outer surface of the pipe able to generate a robust seam weld and join the two sides of the steel coil very tightly.

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Cangzhou Datang Steel Pipe Co., Ltd All Right Resevered.