Patent ID: 6626229
Filing Date: 2003-09-30
Classification: B22D

Abstract:
A process for producing slabs having a thickness D>100 mm, at casting speeds v<3 m/min, in a continuous casting installation, comprising the steps of:supplying melt to a permanent mold in a flow direction from a storage reservoir via an immersion nozzle having a restrictor element at a distance upstream from an outlet end of the nozzle; withdrawing a strand shell enclosing a liquid crater from an aperture side of the permanent mold into a strand guidance frame in a slab withdrawal direction, the melt supplied entering the permanent mold at a speed (vK) whose relationship with respect to strand withdrawal speed (vB) is: vK: vB=6:1 to 60:1; and guiding the melt supplied so that, with regard to melt level, flow filaments of the melt flowing out of the immersion nozzle penetrate into the liquid crater over a length L<2 m in the slab withdrawal direction over a wide front and with a profile which is rectangular in cross section.