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孕育铸铁的强度白口比BI是反映孕育剂对铸造薄壁高性能铸件适应程度的一项重要判据。本文以75SiFe孕育剂为比较对象，对三种常用的含稀土的孕育剂的BI进行了对比试验研究，同时就孕育剂加入量、铁水温度、铁水碳当量、硅碳比以及含硫量对使用不同孕育剂孕育的铸铁的强度白口比BI的影响规律进行了分析。
The strength of cast iron The white ratio BI is an important criterion to reflect the adaptability of inoculants to cast thin-wall, high-performance castings. In this paper, 75SiFe inoculants were compared to compare the BI commonly used rare earth-containing inoculants BI, while inoculant dosage, hot metal temperature, molten iron carbon equivalent, silicon carbon ratio and sulfur content of the use of The effects of different inoculants on the strength of white cast iron than that of BI were analyzed.