| 摘要 |
<p>PURPOSE:To keep the finished temperature of an unsteady part at a target finished temperature after the plate thickness is changed by changing the cooling rate of the unsteady part of a strip when the plate thickness is changed while the changing point of plate thickness passes the 1st rolling stand, then, passes the final rolling stand. CONSTITUTION:After the plate thickness changing point of a strip 1 passes the 1st rolling stand 2A of a tandem mill, an amount of cooling water from a 1st strip cooling device 3A mounted between the 1st rolling stand 2A and a 2nd rolling stand 2B is changed into an amount of preset so that its temperature changes into a target finished one. Whenever the plate thick changing point passes each rolling stand, such operations are performed and while the plate thickness changing point passes the 1st rolling stand, the cooling rate of the unsteady part of the strip wherein the plate thickness is being changed is changed. In this way. since the finished temperature of the unsteady part can be maintained at the target finished temperature after the plate thickness is changed, the yield of a strip product is improved.</p> |
