| 摘要 |
PURPOSE:To reduce the center segregation by detecting the most end position of remained molten steel pool, operating solidification shinkage quantity and the compensating quantity by the surface temp. and next, adjusting water cooling zone length, cooling water quantity and cooling pattern. CONSTITUTION:A moving type rig 2 providing the most end detecting instrument 3 for remained molten metal pool is arranged at downstream side of pinch rolls 4, 9. The detecting 3 is composed of ultrasonic transmitter 11 and receiver 12 facing to both sides of the cast slab 1 and the most end position for remained molten metal is detected, while shifting the longitudinal direction of cast slab 1 through automatic driving carriage 13. The detected signal is inputted to a water quantity control device for cast slab water cooling zone, to obtain solidified profile. Next, by a heat conduction analysis program, the solidification shrinkage quantity and the surface temp. compensating it are calculated to adjust the spray nozzle 5. By optimumly controlling the cooling zone length, cooling water quantity and pattern, the center segregation of cast slab 1 is reduced.
|
