扼要地回顾了稀土钢及其合金化研究的发展历程；阐明了合金化、合金化内耗及用内耗研究合金化的基本思想和铁内耗谱及其机制等理论基础；介绍了用内耗方法研究钢中稀土合金化取得的进展；最后，从钢中稀土的作用和结构材料的发展，展望了用稀土处理钢的前景 The development history of rare earth steel and its alloying is briefly reviewed. The basic theory of alloying and alloying internal friction and alloying with internal friction is elaborated. Theoretical basis of iron internal friction and its mechanism are also introduced. In the rare earth alloy obtained progress; Finally, from the role of rare earth steel and the development of structural materials, prospects for the treatment of rare earth steel prospects