The quilted steel pipe is processed by rolling . Because the surface layer leaves the surface residual compressive stress , it helps to close the surface micro-cracks and hinder the expansion of corrosion. So as to improve the surface corrosion resistance, and can delay the generation or expansion of fatigue cracks, thereby improving the fatigue strength of the quilted steel pipe. Through roll forming, a cold hardened layer is formed on the rolled surface , which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thereby improving the wear resistance of the inner wall of the quilted steel pipe and avoiding burns caused by grinding. . After rolling, the surface roughness value is reduced, which can improve the mating properties. Rolling processing is a kind of chipless processing that uses plastic deformation of metal at room temperature to flatten the microscopic unevenness of the surface of the workpiece so as to achieve the purpose of changing the surface structure, mechanical characteristics, shape and size. Therefore, this method can achieve both smoothing and strengthening purposes at the same time, which cannot be achieved by grinding.