Application of a chamfered slab technology to reduce straight edge seam defects of non-oriented silicon electrical steel generated during flexible thin slab casting process

摘要

The mechanism which ascribes the generation of straight edge seam defects on the non-oriented silicon electrical steel hot rolled strip is proposed. To improve it and the irregular geometry of the slab corner, a chamfered mold was developed and implemented successfully in industrial production process. The temperature distribution of the rectangular and chamfered slabs was analyzed in details here. Results show that a chamfered slab can raise the temperature near the edge, and uniform the temperature distribution of chamfered slab, which will enlarge homogeneous deformation between the slab center and edge during hot rolling process. A chamfered slab technology is an effective way to reduce straight edge seam defects because of that the shape of chamfered slab before broadside rolled is more ideal, the rolling conditions is improved and the amount of bulges is decreased. Therefore, employing a chamfered mold with proper corner size can reduce the tension or stress in the corner region and simultaneously avoid straight edge seam defects effectively during hot strip rolling.