| 摘要 |
<p>PURPOSE:To easily improve the accuracy of cooling stop temperature through a simple equipment constitution by lowering and controlling the flow rate density of the final cooling zone to control the material to the cooling stop temperature in the operation at a low volumetric velocity. CONSTITUTION:On/off valves 6 are provided by one for each header at the latter half part of a cooling equipment installed between a finishing mill 1 and a coiler 2 and in the final zone 3 used to adjust the final cooling shutdown temperature of a steel sheet. Further, flow rate adjusting valves 4 are provided in the midst of branch tubes from the main tubes 5 to supply cooling water at a coiling temperature to each cooling header to the cooling zone, especially, when a kind of steel requiring a highly accurate cooling shutdown temperature is rolled at such a low volmetric velocity as in a threading time, the flow rate adjusting valves 4 in the cooling zone are throttled. In this way, the cooling increment of the cooling zone is lowered and the accuracy of the cooling stop temperature can be improved.</p> |
