Abstract:According to the transverse corner cracks in micro-alloyed steel, the formation reasons of transverse corner cracks in continuous casting slab were determined focusing on continuous casting process parameters, and the control measures were proposed. Through optimizing secondary cooling water, stabilizing mould level, enhancing equipment precision accuracy, adjusting the width of secondary cooling nozzle, employing chamfered mould corner, and controlling nitrogen absorption in molten steel, the slab surface quality is increased. And the transverse corner cracks in continuous casting slab were improved with the occurrence of such defects decreasing from 24% to 2%.