Application of Continuous Casting Mold Fluxes in Crack Sensitive Steel

According to the solidification characteristics of crack sensitive steel,the physical and chemical properties of the mold fluxes which could be applied in the steel are analyzed,and the improvement of the crystallization rate of the mold fluxes and the control of heat transfer are the main measures to solve the defects such as the longitudinal defects,the depression and the leakage of the steel.Based on the tested performance of mould slag and experimental results,two kinds of measures have been put forward,ie,high basicity high crystallization rate（S1） and low basicity high crystallization rate（S2） With implement of S1,the crystallization rate of the mould slag has reached 80%,the surface of the billet is flat,and the ratio of longitudinal cracks is controlled to 0.87%. The crystallization rate of the mould slag used in scheme 2 reaches 80%,which well solves the problem that the low basicity slag is not easy to crystallize. The surface of the cast slab after optimization is flat,and the problems such as longitudinal cracks and pits are well controlled.