抄録
Major losses of steel were due to edge straight crack for hot rolled IF steel strip products. A chamfered slab with 30° chamfered angle was adopted to improve the defect. The deformation and temperature change processes were simulated with dynamic explicit FEM. The temperature of chamfered slab edge and side was higher, and the distribution was more even than rectangle slab. Due to this temperature field and the chamfering shape, the ‘dog bone’ shape of chamfered slab rolled after vertical roll achieved a lower level, and the corner shape changed to circular arc shape. These deformation characteristics in turn brought the advantageous for temperature holding. The chamfered slab used in hot strip rolling experiment reduced the defect ratio from 50% to 7%.
