钢水过热度、拉速和二冷制度是影响铸坯内部质量的重要工艺参数。
The steel liquid superheat, velocity and rule of secondary cooling are important process parameters influence on billet internal quality.
回归分析表明偏析指数与二冷比水量的相关性最大，而与钢水过热度的相关性不强。
Regressive analysis shows segregation index has maximal relationship with water ratio in secondary cooling, and has low relationship with superheat degree of steel.
降低钢水的浇注过热度是提高连铸坯等轴晶率的有效措施。
Low superheat casting is the important method of increasing equiaxed crystal ratio of bloom.
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