In the experiment of producing 25CrMoBVRE and U76CrRE, the ladle input method was used to add rare earth alloy. After pretreatment of hot metal, converter smelting, deoxidization and alloying process, deep desulfurization process in LF ladle refining, the sulfur and oxygen contents in molten steel were very low, which had positive effects on improving the yield of rare earth. The rare earth La-Si-Ca-Fe alloy and Ce-Fe alloy were added into ladle before and after VD by effectively controlling the oxygen and sulfur contents in molten steel as well as the amount added were 0.012% and 0.003% respectively. The test results showed that there was no nozzle clogging, the production process was trouble－free, operations were convenient, yields of rare earth could reach 15% and 40% respectively as well as costs were reduced by 60% and 50% respectively by taking corresponding protective pouring measures. The distribution of rare earth in steel is uniform, which can improve inclusions. The properties of products can fully meet the requirements of product standards and customer use.

rare earth  /  addition process  /  microalloying