METHOD FOR MANUFACTURING CONTINUOUS CAST SLAB

摘要

PROBLEM TO BE SOLVED: To control casting conditions on the basis of a result obtained by accurately estimating a final solidification position and a final solidification shape in continuous casting.SOLUTION: A solidification state of the cast slab in continuous casting is estimated by a heat transmission model using a heat flux based on a cooling condition of at least secondary cooling. Temperature distribution in a width direction of the slab is measured by a thermometer 4 at a preset measurement position in a longitudinal direction of the slab, which is a pulling-out direction of the slab. Heat flux distribution in the width direction of the slab of the heat flux is corrected so that an estimated temperature at the measurement position estimated by the heat transmission model and the temperature distribution in the width direction of the slab measured by temperature distribution measurement means coincide. The center segregation of the slab is reduced by changing the amount of light rolling reduction in a light rolling-reduction zone from a predetermined amount of light rolling reduction on the basis of the estimated final solidification shape and controlling a difference between a shortest final solidification position and a longest final solidification position in a casting direction to be within a reference range.