Spiral steel pipes belong to welded pipes, which refer to seamless steel pipes with seams on the surface that are welded by electric welding after bending into a ring or a square with steel chains or thick steel plates.The ingredients selected for the welded pipe are thick steel plates or hot-rolled

Spiral steel pipe is a spiral seam steel pipe made of strip steel coils as raw material, often warm-extruded under urban pressure, spirally bent and formed by automatic double-wire double-sided submerged arc welding process for inner seam and outer seam welding. The raw materials are strip steel coi