51 steel pipe network tells you what is really seamless

The seamless pipe is a round, square, rectangular steel with a hollow section and no joints around it. The seamless pipe is made by punching a steel ingot or solid pipe, and then made by hot rolling, cold rolling or cold drawing. The seamless pipe has a hollow section and is used in a large number as a pipe for conveying fluids. Compared with solid steel such as round steel, the steel pipe has lighter weight when subjected to the same torsional and torsional strength, and is an economical sectional steel material widely used for manufacturing structures. Parts and mechanical parts such as oil drill pipes, automobile drive shafts, bicycle racks, and steel scaffolds used in construction.
Simply put, it is made of round steel perforated into tube blanks, after calibrating by cold drawing or hot rolling, and then the finished seamless tube. The fake seamless tube appearing on the market is basically the welded tube directly welded or expanded by the welded tube. Most of the welded pipe wall thickness is thin-walled steel pipe, so false seamless is basically thin-walled.
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