| 摘要 |
PURPOSE:To restrain fishtails caused by rolling and to improve the product yield by controlling cooling water flow rates at the outlet side of a continuous casting machine not to excessively cool the central region in the width direction than edge parts in the width direction of a slab. CONSTITUTION:A cooling water rate injected onto the slab 15 at the outlet side of a continuous casting machine 10 is controlled so that the central region in the width direction of the slab 15 is not excessively cooled than edge regions in the width direction. Then, the slab 15 is insulated by an insulation zone 27 and a surface temp. of the slab 15 is raised by recuperative heat. Hence, a temp. distribution in the width direction of a slab surface is substantially uniformized. The slab 15 is directly carried to a rolling mill 30, through no furnace and is rolled. In that time, differences in elongation of the edge regions and central region in the width direction of a slab 15a are eliminated and no fishtail in edge parts in the rolling direction of the slab 15a is substantially generated because a temp. distribution in the width direction of the slab surface is substantially uniform. |
