| 摘要 |
PURPOSE:To stabilize molten steel flow at early stage and to prevent the development of uneven solidification by widely opening roll gap at the time of starting pouring the molten steel, reducing the roll gap after stabilizing the molten steel flow flowed down and regulating the roll gap in accordance with rising of the molten steel surface. CONSTITUTION:The flowing rate is adjusted so that the molten steel quantity supplied into the gap between the cooling rolls 1 from a tundish 4 comes to more than the molten steel flowing quantity flowed downward from the roll gap 6. At the same time of starting to form the molten steel pool 3 at the gap between the cooling rolls 1, the molten steel 5 flowed down from the roll gap 6 forms continuous film-state to the longitudinal direction of the cooling roll 1 and the molten steel 5 flow is stabilized. By reducing the roll gap 6, the surface of the molten steel pool 3 formed at upper part of both cooling rolls 1 is raised and also the roll gap 6 is opened and when the molten steel surface 8 reaches to the prescribed height, the roll gap 6 is adjusted to stationary state. By this method, the molten steel flow is stabilized at the early stage of starting the pouring and the development of the uneven solidification in the cast slab can be prevented. |
