Effect of electromagnetic stirring at secondary cooling area on central segregation of a continuously cast slab

Using layer-by-layer shave steel scrap, the effect of electromagnetic stirring frequency parameter at secondary cooling area on the central segregation and equiaxed crystal ratio of a 1 450 mmx 230 mm slab was investigated by chemical analysis and macrostructure. On the basis of data analysis, three conclusions are drawn:(1) the central segregation is obviously improved when electromagnetic stirring is applied at secondary cooling area, and the positive segregation coefficients of C, P and Mn are lower than those of no electromagnetic stirring; (2) the level of central segregation is all 130.5 when the electromagnetic stirring frequencies are 2, 5 and 8 Hz; and (3) electromagnetic stirring frequency has slight influence on the central equiaxed crystal ratio, and the largest equiaxed crystal ratio appeased in the case of 5 Hz frequency.