A105 THRD ELBOW Has Uneven Deformation During Cold Drawing

The cold drawing deformation of the A105 THRD ELBOW 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 Thermal Insulation Pipes For PUR 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.