| 摘要 |
A hot rolling mill for a steel plate or sheet, which is superior in terms of equipment cost, equipment maintainability, and cooling performance and is capable of efficiently manufacturing a steel plate or sheet having good characteristics by appropriately controlling the temperature of a rolling material; and a method for hot rolling a steel plates or sheet are provided. Specifically, cooling equipment 20 for supplying cooling water onto a top surface and a bottom surface of a steel plate or sheet 10 that is being conveyed is provided at a position near an entrance side and an exit side of a hot rolling mill 12. The cooling equipment 20 includes an upper header 21 having upper nozzles 22 for jetting rod-like water flows 23 onto the top surface of the steel plate or sheet 10 at an angle of depression ¸ U in the range of 30° to 60°, which is positioned such that remaining cooling water 24 supplied to the steel plate or sheet is retained by work rolls 12a. The cooling equipment 20 further includes a lower header 31 having lower nozzles 32 for jetting rod-like water flows 33 onto the bottom surface of the steel plate or sheet 10 at an angle of elevation in the range of 45° to 90°, which is positioned between the work rolls 12a and a table roller adjacent thereto. |
