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Seamless pipe as the name suggests is a pipe without a seam or a weld-joint in contrast to Seam or Welded pipe. In a Seam or Welded pipe, the seam or the weld-joint is the weaker part of the pipe limiting the strength of the pipe to the strength of the weld-joint.
ERW pipes means Electric Resistance Welded Pipe. API 5L ERW pipes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW pipes are available in various qualities, wall thicknesses, and diameters of the finished pipes. China Hua Yuan Steel Pipe is one of the best ERW Pipe manufacturer.