The production of spiral submerged arc welded steel pipes, according to the welding principle of submerged arc welding, each weld seam should have a starting and extinguishing point, but this condition cannot be achieved when each straight seam welded pipe is in the circumferential seam. The alloy content (carbon equivalent) of spiral submerged arc welded steel pipe coils is often lower than that of similar grade steel plates. This also improves the weldability of spiral submerged arc welded steel pipes.