OPERATING METHOD IN PRODUCING PROCESS FOR STEEL AND OPERATING APPARATUS THEREFOR

PROBLEM TO BE SOLVED: To provide an operating method in a producing process for steel with which the molten steel pouring temperature can be obtained in the desired temperature range while considering the unevenness of the molten steel pouring temperature. SOLUTION: A temperature dropping range ΔTd of the molten steel in a ladle, from the time point when the molten steel treatment is finished to the time point when the molten steel pouring is started, is predicted. Then, the maximum unevenness range ΔTdu at high temperature side, and the maximum unevenness range ΔTdd at the lower temperature side, in the temperature dropping range, are predicted. Further, the molten steel treating facility is operated so that the treating finishing temperature Th1 of the molten steel in the ladle as the molten steel temperature at the time point when the molten steel treatment is finished, simultaneously satisfies a formula; Th1≤Tcmax+ΔTd(t)-ΔTdu(t) and a formula; Th1≥Tcmin+ΔTd(t)+ΔTdd(t). Tcmax is the upper limit value in the molten steel pouring temperature range and Tcmin is the lower limit value in the molten steel pouring temperature range, as for the suitable temperature range when the molten steel is poured into the mold. COPYRIGHT: (C)2007,JPO&INPIT