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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 the mold powder was designed by orthogonal design principle. The influence of B2O3 on the viscosity, melting temperature and microstructure of the mold powder was studied. The suitable content of B2O3 in the mold powder was given. The results show that B2O3 can inhibit the formation of high-crystalline cerous-silica in the slag and enhance the ability of the flux to absorb rare earth oxides, ensuring the physical and chemical properties of the fluxes after absorbing the rare earth oxides. B2O3 content of 6% of the flux to absorb 15% of RExOy still ensure stable physical and chemical properties.