| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a steel plate having desired material characteristics with an excellent yield, by eliminating a temperature difference in the longitudinal direction of the steel plate after acceleration cooling.SOLUTION: In a method of manufacturing a thick steel plate by using hot rolling equipment having a reversible type rolling mill and cooling device and an accelerated cooling device arranged on the downstream side of the hot rolling equipment, in the hot rolling equipment, a conveyance speed when the thick steel plate passes through the cooling device, is increased toward an upstream side end part from a downstream side end part of the thick steel plate, the temperature of the upstream side end part of the thick steel plate just before the downstream side end part of the thick steel plate enters the accelerated cooling device, is set to be higher than the temperature of the downstream side end part to compensate a temperature drop in the upstream side end part until the upstream side end part enters the accelerated cooling device after the downstream side end part of the thick steel plate enters the accelerated cooling device, and a difference between the surface temperature of the thick steel plate when the downstream side end part of the thick steel plate enters the acceleration cooling device and the surface temperature of the thick steel plate when the upstream side end part enters the accelerated cooling device, is set to be 10°C or less. |
