本文研究三种稀土孕育剂的孕育效果及其影响因素,分析了稀土孕育剂的组分、基铁的化学成分及稀土孕育灰铸铁的组织和性能的特征,报导了生产浇注铸件的数据,论述了稀土孕育的机理。文中指出,与常用硅铁孕育剂相比,各种稀土孕育剂均有较强的降低白口、抗衰退、改善不同大小断面组织及机械性能的能力。 In this paper, the inoculation effects of three rare earth inoculants and their influencing factors were studied. The composition of rare earth inoculants, the chemical composition of iron and the microstructure and properties of rare earth pregnant gray cast iron were analyzed. The data of casting castings were reported. Rare earth breeding mechanism. The article pointed out that compared with the commonly used ferrosilicon inoculants, all kinds of rare earth inoculant have a strong ability to reduce the white mouth, anti-recession, improve the cross-sectional tissue and mechanical properties of different sizes.