| 摘要 |
<p>PURPOSE: To secure a prescribed temperature deviation inside a steel plate, in the controlled rolling of a thick steel plate, and also to greatly improve rolling efficiency. CONSTITUTION: Immediately in front of or behind a rolling mill 1, a cooling device 2 is arranged which is provided with one or more cooling headers in the advancing direction of both sides of a hot steel plate 3 and which is also provided with plural spray nozzles in the width direction of the steel plate. The cooling device 2 is provided with a cooling water control means for each cooling header and an on/off control means for each spray nozzle. In the case of plural pass rolling while the hot steel plate 3 is cooled, the cooling spray width in a specific rolling pass is set not more than the width of the steel plate being rolled, and also, the spray is shut off in the specific range of the front/tail part of the steel plate.</p> |
