Method for improving slab segregation

The invention discloses a method for improving plate blank segregation, and belongs to the technical field of continuous casting, the method comprises the following steps: a plate blank with the Ni mass fraction larger than or equal to 3% is subjected to dynamic reduction, the plate blank is in the range of fs = 1.0-1.1, and the reduction is 0.5-3 mm. According to the method provided by the invention, dynamic soft reduction is carried out on the high-nickel steel plate blank in the interval of fs = 1.0-1.1 during continuous casting, and the reduction is controlled to be 0.5-3mm, so that molten metal near the positions of 1/4 and 3/4 parts of the plate blank can be fully pressed into surrounding dendritic crystals, solute redistribution is realized, and meanwhile, shrinkage cavities are pressed; and the segregation and looseness problems of the high-nickel steel plate blank near the positions of one fourth and three of four parts are reduced, and the internal quality of the high-nickel steel plate blank is imp