The 125 t CK series of ingot has been increased in our company. The numerical simulation of mould filling and solidification has been performed, so as to estimate the possible defect area. Meanwhile, two optimization programs have been proposed.%完善了我公司空缺锭型125 t CK系列，对充型、凝固过程进行了数值模拟，对可能存在的缺陷区域进行了预判，同时也提出了两个优化方案。
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