| 摘要 |
<p>PURPOSE:To dissolve the unevenness of temperature in the width direction of a strip and to uniformize the distribution of temperature in the width direction. CONSTITUTION:In a method for cooling a hot line of a hot-rolled strip 2, distribution of the temperature in the width direction is measured continuously by width direction temperature detectors 4, 5 installed on the outlet side of a finish rolling mill 1 on a hot rolling line and on the inlet side of a coiler 3 respectively and plural side spray nozzles 12 which face each other on both sides in the width direction of the strip 2 and can freely control spraying angle, spraying rate of water are arranged independently of a group of hot run spray headers 8. The rate of cooling water necessary to make the difference between the maximum and minimum temperatures null and the spraying angle of the side spray nozzle 12 to spray the cooling water to a position at the maximum temperature in the width direction is calculated based on the measured result of the temperature distribution in the width direction of the strip 2 to control the spraying angle and spraying rate of water of the side spray nozzle 12 based on the arithmetic result. Consequently, unevenness of the quality caused by the temperature difference between both edge parts and the central part can be prevented.</p> |
