Melting Efficiently Rare Earth Steel by Whole Scrap Steel

Aimed to efficiently recycle and utilize the scrap steel to produce highend micro-alloyed rare earth steel, this study proposed an integrated process of SiMn deoxidation, Al-enhancing deoxidation, and rare earth micro-alloying based on the high alkalinity refining slag, achieving efficient control of sulfur and oxygen impurities in scrap steel, and producing 7CrSiMnVMo rare earth steel by rare earth Ce alloying. The results show that the sulfur concentration of the 7CrSiMnVMo rare earth steel is only 0.0023%; meanwhile, the total oxygen concentration of scrap steel can reach below 0.0018% after combining Si-Mn deoxidation, Al-enhancing deoxidation, and rare earth micro-alloying with high alkalinity refining slag. And it can form finely dispersed Ce2O3 and Ce2O2S rare earth inclusions by the addition of Ce after sulfur and oxygen control, and the rare earth recovery rate can reach over 80%.