The development of straight welded steel pipe production technology starts from the construction of the manufacturing industry. Due to the fact that the straight joint steel pipe is inseparable from human life and production activities, the production technology of straight joint steel pipe industry not only develops rapidly, but also brings forth new ideas through the old ones. The production of straight welded steel pipe occupies an irreplaceable position in the steel industry.Straight—seam steel tubes are not only used to transport fluids and powdery solids, to exchange heat energy, and to make mechanical parts and containers. They are also economical steel.