| 摘要 |
The present invention provide a manufacturing apparatus of a hot-rolled steel sheet capable of cooling control of a steel sheet even in a case of disposing a cooling device capable of cooling from inside a finishing mill. The manufacturing apparatus of a hot-rolled steel sheet comprises: an immediate rapid-cooling device 20, which is capable of spraying cooling water with a high water volume density, at least a part thereof being disposed inside a final stand in the row of hot finishing mills; a device 45 for measuring a temperature on an entry side of a final stand, which measures a surface temperature of a steel sheet on an entry side of the final stand; a device 47 for measuring a steel sheet passing speed, which measures a passing speed of the steel sheet on the entry side of the final stand; a device 51 for predicting a rapid-cooling stopping temperature, which calculates a predicted rapid-cooling stopping temperature based on the surface temperature of the steel sheet, the steel sheet passing speed, and the water supply volume or water supply pressure of the immediate rapid-cooling device respectively measured; and an immediate rapid-cooling control device 52, which corrects the water supply volume or water supply pressure of the immediate rapid-cooling device such that the predicted rapid-cooling stopping temperature matches a targeted rapid-cooling stopping temperature. |
