Abstract: In order to solve the problems such as corner cracks, surface depressions and slag entrapment defects of cast billet during continuous casting of ML08Al cold heading steel produced by a steel mill in China, the theoretical analysis and field experiment methods were adopted. The results show that the surface quality of ML08Al cold heading steel continuous casting slab is related to multiple parameters of field production. By optimizing the water distribution in the secondary cold zone, the physicochemical properties of the mold flux, the composition of the steel, and the current mold electromagnetic stirring parameters can effectively reduce the surface defects of the ML08Al cold heading steel and its surface quality has been significantly improved.

Key words: ML08Al steel, cold heading steel, continuous casting slab, surface quality