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Straight seam steel pipe is a general term for high-frequency straight seam, submerged arc straight seam, electric welding straight seam, pipeline straight seam, etc. High-frequency straight seam steel pipe uses the skin effect of high-frequency current to generate high temperature and external force at both ends of the steel plate in a short period of time. Squeeze, which is a true electrodeless base metal butt. Using hot-rolled coils as raw materials, the wall thickness of ERW pipes can be controlled to about ±0.2mm. The ends of the steel pipes adopt the American APL standard or GB/T9711.1 standard. The pipe ends are cut and the conveying length is fixed. In recent years, ERW steel pipes have been widely used as the main steel pipes in urban pipe networks in natural gas pipeline network projects and natural gas enterprises. At present, ERW high-frequency straight seam steel pipes account for 60% of the world's steel pipe usage.