| 摘要 |
<p>PURPOSE:To uniformize the distribution of cooling stop temperatures in the longitudinal direction of a steel sheet by reducing the speed of the steel sheet which is being cooled according to the passing position of the sheet in a cooling device and passing the sheet through the passing position. CONSTITUTION:A thick steel sheet, etc., are passed and cooled by a dip type water cooling device. In that process, the speed of the steel sheet which is being cooled according to the passing position of the sheet is reduced and passed. In other words, the reduction of cooling capacity by the cooling device in the dipping condition is estimated by parameters of temperature for stopping cooling and of sheet thickness and the speed of the steel sheet which is passed and cooled is reduced. For example, when the length position of the steel sheet in which reduction of cooling capacity stops advances 11m from the tip into the cooling device, the passing speed is reduced from 120mpm to 100mpm. Consequently, the temperature for stopping cooling coincides with the temperature for stopping cooling at the tip part of the steel sheet over all the length and a uniform temperature for stopping cooling in the longitudinal direction is obtained.</p> |
