IMPROVEMENT OF INTERNAL QUALITY IN CONTINUOUSLY CAST SLAB

摘要

PURPOSE: To concentrate the plastic deformation into the center part of a cast slab and to eliminate the segregation and the porosity by executing partial rolling reduction to the center part in the width direction of the cast slab just after solidifying with a projecting tool forming the flattened surface at the center part of the tip end surface and the tapered surfaces at both sides from the flattened surface. ;CONSTITUTION: The partial rolling reduction is executed to the center part in the width direction of the cast slab 1 just after solidifying, produced by a continuous casting method, with the projecting tool 10 forming the flattened surface 11 at the center part of the tip end surface and the tapered surfaces 12 at both sides from the flattened surface so as to gradually increase the width as being apart from this flattened surface. By this method, the same rolling reduction is secured with the small rolling force and the large rolling reduction can be obtd. by the same rolling reduction capacity of the rolls and also, spread into the width direction of the cast slab 1 is restrained and the plastic deformation can be concentrated to the center part of the cast slab. In this result, the elimination of the defective internal quality of the segregation, porosity, etc., in the inner part of the cast slab can effectively be executed.;COPYRIGHT: (C)1994,JPO