通过对ZG32Cr06铸钢粗晶成因的分析及消除粗晶的工艺性能试验，探讨了粗晶导致铸件断裂的机理。试验证明，由于浇铸温度过高，水爆清砂时开箱过早而产生的粗晶可以用热处理方法消除，同时提出了铸件在浇铸时防止粗晶的措施。

The relation between coarse grain and rupture of casts was found through analyzing the formation of coarse grains and tests for eliminating coarse grains on ZG32Cr06 cast steel. The results of tests show that the coarse grains, as a results of too high casting temperature and the premature trunk opening in water explosion blast cleaning , can be eliminated by heat treatment. The measures for preventing coarse grains in casts were proposed.