| 摘要 |
PURPOSE:To control cooling speed of a hoop without lowering line speed by passing the hoop through plural cooling rolls and changing pushing rate or roll interval of the cooling rolls in accordance with thickness of the hoop. CONSTITUTION:The hoop is continuously passed through plural cooling rolls. In the roll cooling method for the hoop, the pushing rate of the cooling rolls and/or roll interval are changed so that the cooling speed of the steel strip becomes to the preset optimum cooling speed. By this method, contacting angle and non-contacting length between the steel strip and the cooling roll are changed. Further, by this method, the cooling speed of the hoop can be controlled without lowering the line speed. |
