稀土处理钢(rare earth streated steel)是加入适量稀土元素以改变其组织和性能的钢。稀土元素包括周期表中第Ⅳ周期的钪，第V周期的钇和第Ⅵ周期的镧族元素镧、铈、镨、钕等总共17个元素。这些元素具有相似的电子层结构，在外面的d和s层都有3个价电子，因而它们有相似的化学、物理性质，且在矿石中往往是共生的，提炼时不易分离。在冶金工业中应用也常为混合稀土金属。
应用新型的稀土处理钢用保护渣没有发生拉漏事故，并提高了铸坯表面质量。
Break out accidents have never occurred and surface quality of slabs has been improved since introduction of this new type of mould flux into continuously casting the rare earth treated steel.
总结了碳钢和不锈钢以及铝、锌、铜、镁等金属及其合金稀土钝化处理的国内外研究状况。
The research status worldwide of rare earth passivation treatment of carbon steel and stainless steel, aluminum, zinc, copper, magnesium and its alloy were summarized.
利用冲击疲劳试验，研究了稀土变质及热处理对低铬半钢抗冲击疲劳性能的影响。
The effect of re modification and heat treatment on impact fatigue property of low chromium cast semi steel was studied by means of impact fatigue test.
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