Straight seam pipe is a steel pipe whose weld seam is parallel to the length direction of the pipe. It is usually divided into metric electric welded steel pipe, electric welded thin-walled pipe, transformer cooling oil pipe, etc. Longitudinal welded pipe production process is simple, high production efficiency, low cost, rapid development. Used for conveying low-pressure fluids. Steel pipe need to carry out water pressure, bending and other experiments, the surface quality has certain requirements. Usually, the delivery length is 4-10m, usually need to be fixed length (or double length) delivery, welded pipe specifications in nominal diameter (mm or inch). The nominal diameter is different from the actual diameter. According to the specified wall thickness, welded pipe is divided into ordinary steel pipe and thickened steel pipe.
