METHOD AND APPARATUS FOR DETECTING BREAKOUT IN CONTINUOUS CASTING, CONTINUOUS CASTING METHOD FOR STEEL USING THE APPARATUS, AND BREAKOUT PREVENTION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus which can detect accurately breakouts generated in a slab in continuous casting for molten steel. SOLUTION: Regarding the breakout detection method in continuous casting, a heat flux q1 of heat input to a solidified interface from when molten steel in a mold is at bath level to when it reaches a mold exit, is measured; a steady solidification interface heat input q2reg, caused by the flow of the molten steel in the mold in a steady state, is obtained based on formula (1), q2reg=h×Δθ; a heat flux profile is obtained for the difference (q1-q2reg) between the heat flux q1 and the steady solidification interface heat input q2regfrom when the molten steel is at bath level to when it reaches the mold exit; and whether a breakout occurred is determined, based on the heat flux profile; wherein, q2regis the steady solidification interface heat input (J/s×m2); h is the heat transfer coefficient (J/s×m2×°C) between the molten steel and a solidified shell; and Δθ is the degree of superheat (°C) of the molten steel. COPYRIGHT: (C)2010,JPO&INPIT