Water cooling time setting method of cooling equipment in the thickness steel plate manufacturing apparatus and thick steel plate manufacturing equipment

摘要

PROBLEM TO BE SOLVED: To efficiently conduct controlling without changing the layout of a hot rolling line and causing cooling waiting time during rolling by a reversible rolling mill on the downstream side.SOLUTION: When rolling has been completed by a rough rolling mill, a cooling applicable time t0 until the time when a material to be rolled is started to be rolled by a finishing mill, and a rolling start target temperature &thetas;t in the finishing mill when the temperature of the material to be rolled is made below a non-recrystallization upper limit temperature &thetas;α when the material to be rolled has been rolled up to an optional intermediate plate thickness on the midway of rolling by the finishing mill, are estimated, and the water cooling time tw by a cooling apparatus is calculated and set on the basis of the estimated results.