Melting Efficiently Rare Earth Steel by Whole Scrap Steel

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