Spiral steel pipes are named after their spiral shaped inner and outer submerged arc welding seams. Spread the hot-rolled coil plate flat through the uncoiling equipment and deliver it to the next process. Before entering the next process, cut the end of the hot-rolled coil plate evenly. After the forming process, the hot-rolled coil is made into a cylindrical shape through the forming equipment, and the roundness should meet the standard. The circumference should be measured.