Casting blank center segregation control method

The invention belongs to the technical field of metallurgy, and particularly relates to a casting blank center segregation control method which is particularly suitable for control over center segregation of a marine corrosion-resisting steel rib casting blank. The control method comprises a secondary cooling process and a soft reduction process in continuous casting, weak cooling is adopted in the secondary cooling process, and the specific water flow ranges from 0.4 L/kg to 1.2 L/kg; the solid phase rate of the reduction interval in the soft reduction process is 0.3-0.8, and the reduction amount is 8-14 mm. According to the control method, segregation of the sulfur element and the manganese element in the casting blank can be remarkably reduced, and through inspection, the center segregation level reaches 1.0 level, and the center segregation index is smaller than 1.10. 本发明属于冶金技术领域，具体涉及一种铸坯中心偏析的控制方法，尤其适用于海洋耐蚀钢筋铸坯中心偏析的控制。该控制方法包括连铸中的二冷过程和轻压下过程，其中二冷过程采用弱冷，比水量为0.4L/kg-1.2L/kg；轻压下过程的压下区间固相率为0.3-0.8，压下量为8mm-14mm。