Electric resistance welded (ERW) pipe is manufactured by cold-forming a sheet of steel into a cylindrical shape. Current is then passed between the two edges of the steel to heat the steel to a point at which the edges are forced together to form a bond without the use of welding filler material. Initially this manufacturing process used low frequency A.C. current to heat the edges. This low frequency process was used from the 1920’s until 1970. In 1970, the low frequency process was superseded by a high frequency ERW process which produced a higher quality weld.
Over time, the welds of low frequency ERW pipe was found to be susceptible to selective seam corrosion, hook cracks, and inadequate bonding of the seams, so low frequency ERW is no longer used to manufacture pipe. The high frequency process is still being used to manufacture pipe for use in new pipeline construction.
Specifications of ERW Pipe (Electric Resistance Welded Pipe):
1) Outside Diameter: Ф219mm - 660mm
2) Wall Thickness: 6mm - 22mm
3) Length: 3m - 12m
4) Steel Grade: Q345B, API X42 - X80, L245, L555, J55, N80
5) Standard: SY/T5037-2000, GB/T9711.1-97, API Spec 5L
Features of ERW Pipe (Electric Resistance Welded Pipe):
1) Economic benefit: ERW steel pipe is less expensive than seamless steel pipe.
2) High precision: ERW steel pipe has a closer tolerance of wall thickness when compared with seamless steel pipe
Processing of ERW Pipe (Electric Resistance Welded Pipe):
Packaging of ERW Pipe (Electric Resistance Welded Pipe)
Shangahi Metal Corporation Products are packed and labeled according to the regulations and customer's requests. Great care is taken to avoid any damage which might be caused during storage or transportation. In addition, clear labels are tagged on the outside of the packages for easy identification of product and quality information.
1) Shanghai Metal Standard
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