【摘要】 为了研究性能稳定的低碳钢板坯连铸用无氟保护渣,在测试传统的板坯连铸用高氟保护渣(F-≥3%)性能的基础上,采用单纯形法,设计了CaO-SiO2-Al2O3-Fe2O3-MgO-Li2O-TiO2-Na2O-MnO-B2O3渣系中满足保护渣组成条件的基本实验点.通过逐步固定各组分含量,将多维空间的渣系组成转化为二维平面网格.测试无氟渣样的熔点、黏度、转折温度、玻璃体比例及转折温度时的黏度,并作性能与组成关系的等值线图.通过比较高氟保护渣和无氟渣样性能,确定了碱度、熔点、黏度、转折温度较低,且凝固后呈玻璃体的低碳钢板坯连铸用无氟保护渣的三个生成区域,其中之一的典型成分的质量分数范围是:CaO31.2%,SiO236.8%,Al2O33%,Fe2O31%,MgO2%,Li2O2%,TiO26%,Na2O7%～12%,MnO3%～8%,B2O30～3%.更多还原

【Abstract】 In order to develop fluorine-free mold fluxes into stable properties for slab continuous casting of low carbon steel,the formation regions of fluorine-free mold fluxes were investigated.Based on the test of the physical properties of traditional fluorine containing(F-≥3%)fluxes,the slag samples,fitting to the compositional characteristics of mold fluxes,were designed by using the mathematical complex method in the slag system of CaO-SiO2-Al2O3-Fe2O3-MgO-Li2O-TiO2-Na2O-MnO-B2O3.By fixing some variable components step by step,the multidimensional composition space was transformed into two-dimensional plain grids,from which the nodal points were used as compositions of fluxes.Compared with the properties of fluorine containing fluxes,three formation regions of fluorine-free fluxes,with a lower basicity,melting point,viscosity and breaking temperature,and solidified in the glassy state,were found.The typical components in one of the regions were CaO 31.2%,SiO2 36.8%,Al2O3 3%,Fe2O3 1%,MgO 2%,Li2O 2%,TiO2 6%,Na2O 7%-12%,MnO 3%-8%,and B2O3 0-3%.更多还原