METHOD FOR CONTROLLING FLOW IN MOLD FOR WIDE WIDTH AND THIN AND MIDDLE THICKNESS CAST SLAB

摘要

PROBLEM TO BE SOLVED: To carry out the stable casting while controlling the flow in a mold, particularly at the time of casting at a low speed by changing impressing direction of electromagnetic force acted to molten steel in the mold according to the level of the casting speed. ;SOLUTION: Based on a reference value of the casting speed, the impressing direction of the electromagnetic force is changed so that the molten steel flow from an immersion nozzle 1 is decelerated in the case of being the reference value or higher, and the molten steel flow is accelerated in the case of being less than the reference value, and the casting is executed. The molten steel poured into the mold 2 from the immersion nozzle 1 forms a spouting flow 4 toward the short wall 3 side and this spouting flow 4 collides against the short wall 3 surface and divides into the ascending flow 5 and the descending flow 6. The ascending flow 5 becomes the ascending flow 8 toward the immersion 1 direction near the molten steel surface 7. The spouting flow 4 toward the short wall 3 side is decelerated with the action of the electromagnetic force impressed with an electromagnetic coil 9 arranged so as to circulate the back surface of the mold 2. Therefore, the ascending flow 5 toward the molten steel surface 7 direction is also decelerated, and the variation of the molten steel surface in the mold is restrained.;COPYRIGHT: (C)1999,JPO