CONTINUOUS CASTING METHOD OF STEEL

摘要

PURPOSE:To prevent central segregation, etc. by stirring electromagnetically a residual molten steel which is not solidified yet to attain specific regular system crystal grain percentage, disposing a small-diameter roll group having a prescribed pitch and shape in the final solidifying part and executing further cooling with specific cooling intensity. CONSTITUTION:An electromagnetic stirrer 1 is disposed to a continuous casting installation and the residual molten steel which is not solidified yet is electromagnetically stirred so as to attain <=25% regular system crystal grain percentage. The small-diameter roll group having <=275mm pitch is provided in the range of >=3m just before the final solidifying part to provide taper alignment to the ingot to the extent corresponding to the rate of shrinkage on solidification and temp. drop. The force cooling is further executed from right under the mold up to the final solidifying part of the ingot at the cooling intensity of >=1.7l/kg.steel specific water flow rate. The central segregation of the ingot is prevented by the electromagnetic stirring and the generation of the V segregation is also prevented by the force cooling and the small-diameter roll group according to the above-mentioned method.