Straight seam steel pipe is a welded steel pipe with one longitudinal weld line on the pipe body. GB / 9711.1 specifies that the straight seam steel pipe can have two straight welds when the diameter is over 914.4, and the angle of the weld is 180 degrees. Weld quality requires the same technical parameters as straight seam steel pipe.

According to the production process, it is divided into: ERW high-frequency straight seam steel pipe, JCOE straight seam steel pipe, rolled straight seam steel pipe. Straight seam steel pipe is a general term for high-frequency straight seam, submerged arc straight seam, electric welding straight seam, pipeline straight seam and other production process products.

The high-frequency straight seam steel pipe use the skin effect of high-frequency current to cause high temperature at both ends of the steel plate in a short time and squeeze and fused together by external force. It is a true buttless base metal butt joint. ERW high-frequency straight seam steel pipe uses hot-rolled coil as the raw material, and the uniform wall thickness can be controlled to about ± 0.2mm.The ends of the steel pipe are according to the American APl standard or GB / T9711.1 standard. Delivery and other advantages. In recent years, various natural gas pipeline network projects and gas companies have widely adopted ERW steel pipes as the main steel pipes of urban pipeline networks. At present, ERW high-frequency straight seam steel pipe accounts for 60% of the world's steel pipe use ratio.

Straight seam steel pipe in Hebei refers to the double-sided submerged arc straight seam steel pipe produced by JCOE. It formed by JCOE cold forming. The welding seam uses welding wire and submerged arc with granular flux. Submerged arc welded straight seam steel pipe is mainly flexible production process, can produce any size and wall thickness in the middle of 325mm-1420mm. It is meet the use of steel pipe size standards in various countries in the world, and high frequency straight seam steel pipe is usually used in the production of specifications.