Definition of LSAW steel pipe and SSAW steel pipe

　　SSAW steekl pipe is the low carbon carbon structural steel and low alloy structural steel strip according to certain helix Angle (also called the molding Angle) rolled into a tube billet, then pipe seam welding made up, it can use a narrow strip in the production of large diameter steel pipe. The spiral welded pipe is mainly a spiral submerged arc welded pipe (SSAW), which is widely used in the construction of various gas pipelines in China, and its specifications are indicated by the outer diameter * wall thickness. The spiral welded pipe has single side welding and double-sided welding. The welded pipe shall ensure the water pressure test, the tensile strength and the cold bending performance of the weld shall meet the requirements. Definition of straight welded pipe and spiral welded pipe.

　　LSAW steel pipe is the hot rolled plate volume after molding machine molding, the deformation of steel coil to smooth cylinder, using high frequency current skin effect and proximity effect or flux layer burning under the arc welding, the tube billet is heated to melt, and fusion under certain extrusion effect, after the final cooling forming. Among them, high frequency current melting is called high frequency straight seam welded tube (ERW), which is known as straight seam submerged arc welding (LSAW).

　　LSAW steel pipe main raw material is low carbon steel hot-rolled coil, hot rolled band, in petroleum, metallurgy, construction, coal mine, port, machinery and other industries are widely used in oil and gas transportation, low pressure water gas, mine fluid conveyor, belt conveyor roller, auto transmission shaft, etc.