What are the three major methods of steel pipe manufacturing?
Seamless hot rolling, high frequency welding, submerged arc welding
According to different production processes, steel pipes are generally divided into seamless steel pipes and welded pipes. According to different processes, welded pipes are divided into high-frequency straight seam welding (ERW) and submerged arc welding.
Submerged arc welded pipes are divided into spiral welded pipes and straight seam welded pipes according to different pipe diameters.
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