针对连铸大方坯内部存在中心疏松与裂纹缺陷的问题,通过凝固传热模型研究其凝固传热过程,从而获得铸坯温度与凝固坯壳厚度分布,以及两相区区间。在此基础上开发了大方坯轻压下工艺,确定了最佳的轻压下区间和压下量。采用优化的轻压下技术,铸坯内部质量得到了明显的提升,基本上消除了中心疏松和裂纹的问题。 Aiming at the problem of loosening and crack defects in the center of continuous casting bloom, the solidification heat transfer process was studied through the solidification heat transfer model to obtain the distribution of slab temperature and thickness of solidified shell and the interval between two phases. On the basis of this, the process of the bloom compacting was developed to determine the optimum soft reduction range and reduction. Using the optimized soft reduction technology, the internal quality of the slab has been significantly improved, basically eliminating the center of loose and crack problems.