| 摘要 |
<p>Twin-roll casting method for casting steel strand of thickness preferably 5 to 35 mm. Immediately downstream of the twin rolls, the cast strand is cooled by directing it through a stationary cooled mold (10). Subsequent to exiting the stationary mold, the strand is directed through a series of cooling rolls thereby further cooling the strand both by contact with the rolls and by spraying with water. The level of the pool of molten steel above the twin rolls is maintained such that the surface of each twin roll located between the meniscus of the pool of molten steel and the gap between the twin rolls is preferably in the range about 30° to about 45°. The strand is directed through the stationary mold (10) at the rate of 1 to about 6 tonnes per minute. The surfaces of the twin rolls are continually lubricated, ground, and heated. Operational parameters are adjusted so that solidification of the strand occurs less than about 10 % by contact with the twin rolls and at least about 90 % downstream of the gap between the twin rolls. The metallurgical length is selected to be between about 0 and 3 m. The cast strand is subjected to soft reduction for segregation control. Downstream of the stationary mold (10), the cast strand may be reduced in thickness by a series of hard reductions to form steel strip having a thickness of about one-third or less of the thickness of the cast strand.</p> |
