API 5L PSL1 X42 Welded Steel Pipe use for construction black pipe

The process of high-frequency welded pipe production depends on the product variety, from raw materials to finished products need to go through a series of processes, the completion of these processes require a variety of mechanical equipment and welding, electrical control, detection devices, these devices and devices in accordance with different processes with a variety of reasonable layout of the process, high-frequency welded pipe typical process: open book – strip leveling – head and tail shear – steel butt welding – live storage – forming – welding – remove the burr – sizing – initial inspection – straightening of pipe – pipe section processing – water pressure test – flaw detection – printing and coating – finished product.

Therefore, the high-frequency welding production of general-purpose steel pipe has a high productivity because of high-frequency welding speed, to the pipe to remove the burrs difficult, which is the current high-frequency welded steel pipe is not acceptable for the chemical industry, nuclear industry one. From the welding material, high-frequency welding can be welded all types of steel pipe.

ERW 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 pipe weight in kg (or pounds).
In the last few years, ERW 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 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 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.