| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a control method by which the control accuracy of the width of a hot-rolled steel sheet is improved which sheet is hot-rolled using a heating device provided between a roughing mill and a finishing mill. SOLUTION: Sheet width control is performed by changing the opening degree of the rolls of a vertical rolling mill 30 on the basis of either the estimated value of the temperature of a rough-rolled stock when it is reduced breadthwise with the vertical rolling mill 30, which value is estimated on the basis of the measured value of the temperature of the rough-rolled stock on the outlet side of the heating device 20, or the estimated value of the temperature of the rough- rolled stock when it is reduced breadthwise with the vertical rolling mill 30, which value is estimated on the basis of the rough-rolled stock on the inlet side of the heating device 20 taking the temperature rise due to the heating device 20 into consideration. It is permitted to perform the sheet width control by the change of the tension between the stands 31-37 of the finishing mill in place of breadthwise reduction with the vertical rolling mill 30.</p> |
