Residual Stress Analysis on Warping Deformation Tinplates after Strip Cutting

The residual stress of tinplates which warped after strip cutting was measured by X-350A type X-ray stress tester. It was found that a small amount of residual stress was released during the strip cutting, and no new residual stress was produced. And the residual stress of the tinplates in different producing stage was also measured. The results show that large residual stress was found in the cold-rolled strip before continuous annealing and leveling process. After leveling process, the residual surface stress of the strip is obviously smaller than that of the cold-rolled strip, but there still existed some residual stress. After tinning, the residual stress of the tinplates was in the same level of that of the strips after leveling process. The warping deformation was mainly caused by the uneven longitudinal extension of the upper and lower surface of the strip in the course of flat rolling. This research work was useful to solve the problem of warping deformation of tinplate during strip cutting and to improve the tinplate production process.