对用含稀土的各种中间合金处理铁水的过程加以全面研究,观察它们对石墨球化程度和铸铁性能的影响[1],就可制订出生产蠕虫状石墨的高强铸铁的可靠工艺。结果认为,含有30%稀土(其中4～5%Y;40～50%Si;Fe和其它混合物)的中间合金是最有效的。依生产条件不同,中间合金可于1350～1400℃温度下直接加到坩埚里,或者于1430～1480℃温度下加到包底,或者加到铁水流中。稀土的最后残留量主要是根 A comprehensive study of the treatment of hot metal with various master alloys containing rare earths and their effects on the degree of graphite spheroidization and the properties of cast iron [1] have led to the development of a reliable process for the production of high-strength, vermicular graphite cast iron. As a result, it is considered that the master alloy containing 30% rare earth (4 to 5% Y; 40 to 50% Si; Fe and other mixtures) is the most effective. Depending on the production conditions, the master alloy can be directly added to the crucible at a temperature of 1350 to 1400 ° C or at a temperature of 1430 to 1480 ° C or to the hot metal stream. The final residue of rare earth is mainly the root