| 摘要 |
PROBLEM TO BE SOLVED: To accurately determine on-line the degree of center segregation varying with a final solidification shape spatially and temporally in the width direction of a continuous cast slab during 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 4b at a preset measurement position in a longitudinal direction of the slab, which is a pulling-out direction of the slab. In addition, heat flux distribution in the width direction of the slab of the heat flux is corrected so that the 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 degree of center segregation of the slab is determined by comparing a difference between a shortest final solidification position and a longest final solidification shape determined based on an estimated final solidification position and shape with a threshold value specified for each steel product. |
