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Through the study of the slab continuous casting production process and laboratory simulation, the mechanism of transverse corner cracks on a micro-alloyed high-strength steel slab was explored. Then, a chamfered mold was developed and tested on the caster. The results show that on one hand, the chamfered mold could raise the temperature of the corner in the mold, and on the other hand, the higher temperature of the corner of the slab was an effective way to decrease the corner stress at the straightening point. The straightening deformation rate on the chamfered slab was lower than that on the square slab. Using the large chamfer mold technology, the optimization design of the foot roll structure and second cooling, the transverse corner crack was improved effectively. The hot transporting ratio was increased without the cutting angle.

Application of a chamfered mold to improve corner defects of HSLA during slab continuous casting