B_2O_3在稀土钢连铸保护渣中作用机制的研究

Research on Mechanism of B_2O_3 in Mold Powder during Continuous Casting of Rare Earth Steel

采用正交实验设计原理设计保护渣的组成,研究B2O3对稀土钢连铸保护渣的粘度、熔化温度和组织结构的影响,提出了B2O3在稀土钢连铸保护渣中的合适含量。结果表明,B2O3可抑制熔渣中高熔晶体铈钙硅石的生成,增强保护渣吸收稀土氧化物的能力,保证保护渣吸收稀土氧化物后理化性能的稳定。B2O3含量为6%的保护渣吸收15%的RExOy后仍能保证稳定的理化性能。

The composition of mould fluxes was designed according to the principle of orthogonal design. Effects of B2O3 content on viscosity, melt temperature and structure of mold powder mixture were investigated. The optimum content of B2O3 in the mixture was also suggested. The results show that B2O3 can prevent precipitation of crystalline phases RE2O3· CaO· 2SiO2 from the melt, increase the absorption capability of the molten mixture for RExOy and enhance the stability of the physical-chemistry properties in the mold powder. After absorbed 15% RExOy, the mold powder with 6% B2O3 can still keep the stability of the physicalchemistry properties.