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随球化剂加入不同量的稀土，处理合硫量不同的铁水，浇注阶梯试块，对全相组织分析表明；少量稀土增加石墨球数，减少铸态碳化物；超过一定量后，稀土特使碳化物量增加，最佳稀土加入量与原铁水含硫量有关．对于薄壁铸件及低硫原铁水，稀土的这种作用更明显，且其适宜的加入量范围更窄．
With the nodulizer added different amounts of rare earth, molten iron with different amounts of sulfur, pouring ladder test block, the analysis of all phases showed that a small amount of rare earth graphite balls to increase the number of reduced as-cast carbide; more than a certain amount, rare earth envoys The amount of carbides increased, the best addition of rare earth elements and the amount of sulfur content of the hot metal. For thin-walled castings and low sulfur raw water, this effect of rare earth is more obvious, and its suitable range of adding a more narrow.