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研究了RE－Ca及RE－Ca－Ti两种复合变质处理方法对改善ZG55钢组织与性能的影响。结果表明，加入适量的RE、Ca及Ti，可使钢的铸态一次晶细化．魏氏组织消除．铁素体由条状大块分布变为均匀的小块分布；非金属夹杂由不规则大块状聚集分布变为点状弥散分布。从而使钢具有较高的机械性能并克服了原钢种的热裂倾向大的缺点。此外，研究还表明，采用RE－Ca－Ti处理比RE－Ca处理效果好，但两者差值并不大，因此，一般情况下，只采用RE－Ca处理即可。
The effects of RE-Ca and RE-Ca-Ti composite modification on the microstructure and properties of ZG55 steel were studied. The results show that, adding an appropriate amount of RE, Ca and Ti, the steel can cast a fine grain refinement. Wei’s organization to eliminate. Ferrite changes from a strip-shaped block into a uniform patch. Non-metallic inclusions change from an irregular massive agglomeration distribution to a point-like diffuse distribution. So that the steel has a high mechanical properties and overcome the shortcomings of the hot cracking tendency of the original steel. In addition, the study also shows that, RE-Ca-Ti treated with RE-Ca treatment effect, but the difference between the two is not large, therefore, under normal circumstances, only the RE-Ca treatment can be.