SA213 Seamless Steel Pipe Has Uneven Deformation During Cold Drawing

The SA213 Seamless Steel Pipe has uneven deformation during the cold drawing process, thereby generating additional stress, and the additional stress becomes residual stress in the tube after cold drawing. The degree of uneven deformation of the seamless steel tube determines the magnitude and distribution of its residual stress.

The cold drawing deformation of the LTCS Carbon Steel Seamless Pipes is determined by its deformation characteristics. Since no mandrel participates in the processing of the pipe wall during the emptying process, and the thickness of the pipe wall does not change much after deformation, the deformation condition and deformation state of the inner and outer layers of the seamless steel pipe are greatly different, resulting in uneven deformation.

During the deformation process, since the metal near the inner surface of the seamless steel pipe first enters the plastic deformation state, and the metal flows along the axial direction without being affected by the resistance generated by the friction, the unevenness of the axial deformation along the wall thickness direction occurs. The natural extension of the outer layer of seamless steel pipe is significantly lower than that of the inner layer. In this way, the axial and tangential additional tensile and additional tensile stresses produced in the outer layer of the seamless steel tube are maximized; in contrast, the axial and tangential additional compressive and compressive stresses generated in the inner layer of the seamless steel tube are also At the maximum, the additional stress becomes residual stress in the tube after deformation.