Application of a Chamfered Slab to Reduce Risk of Edge Straight Crack on Hot Rolled Strip Surface

Abstract

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%.

Formation Mechanism and Control Strategy of Edge Seam Defects for Hot Rolling Interstitial‐Free Steel

“…The deformation shape and temperature distribution of common slab and chamfered slab have been analyzed by the slab rolling experiment and finite element software. [ 18,19 ] Results showed that chamfered slab can avoid extremely low temperature at the corner and reduce the possibility of metal folds at the corner due to the absence of a sharp corner. In addition to cause analysis, researchers have also studied the direction of equipment and process parameters to solve edge seam defects.…”