Danieli Automation LPCS Liquid Pool Control System to improve quality of continuously cast slabs

摘要

The casting stand is divided into cooling sectors, and each sector into a finite number of transversal sections. The estimation of the mushy and liquid pool length permits real-time updating of the roll gap configuration for Dynamic Soft Reduction (DSR) control. The main achievement of this is to prevent internal defects, such as centerline porosity, segregation, and chemical discontinuity. This improves the final slab quality. Soft reduction is the increased reduction in roll gap, above the normal thermal contraction rate, to provide a gradual "squeezing" of the strand in order to compress the centerline of the slab at the final point of solidification and thus improve the final slab internal quality. It is applied in the mushy zone, and thereby prevents the suction of solute rich material into the center of the slab at the final point of solidification. In this way, it minimizes centerline segregation.