China HFW/ERW Pipe Mill Manufacturers, Suppliers,
API Standard Straight Seam High Frequency 219mm ERW Welded Tube Making Mill. Electric resistance welded pipe is manufactured by cold-forming a sheet of steel into a cylindrical shape 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.
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