·During the forming process, the deformation of the steel plate is uniform, the residual stress is small, and the surface is not scratched. The processed spiral steel pipe has greater flexibility in the size range of diameter and wall thickness, especially in the production of high-grade steel-grade thick-walled pipes, especially medium- and small-diameter thick-walled pipes, which have incomparable advantages in other processes, which can meet the needs of users. More requirements in terms of spiral steel pipe specifications.