Rectangular pipes are divided into seamless steel pipes and welded steel pipes (seamed pipes) hot-rolled seamless square pipes, cold drawn seamless square pipes, extruded seamless square pipes, and welded square pipes. The seam square tube is a profile with square cross-section shape and size made of Q235 hot-rolled or cold-rolled strip or coil as the base material, which is formed by cold bending and then is welded by high-frequency welding. The company has rich experience in pipe making, and can produce square pipes/rectangular pipes of various special specifications according to customer requirements. The product specifications are complete; the diameter of 20mm-800mm can be arbitrarily modified.