This paper deals with the salt bath chromizing techniques and the effect of RE as a catalytic agent in salt bath on T12A steel chromizing technique, layer microalloying, structure and properties.

• 研究了熔盐被覆铬碳化物的工艺过程，着重探讨了稀土对T12A钢熔盐渗铬的催渗及微合金化作用机理。