低碳钢板坯连铸用无氟保护渣生成区域的研究  

Formation zone of fluorine-free mold fluxes for slab continuous casting of low carbon steel

作　　者：王谦[1] 何生平[1] 解丹[1] 黄青云[1] Z．S．LI K．C．MILLS 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]英国伦敦帝国理工学院材料系,伦敦SW7 2AZ,英国

出　　处：《北京科技大学学报》2008年第5期487-491,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金;宝钢联合基金资助项目(No.50474023)

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%.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-A12O3-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 %, AI2O3 3 %, Fe2O3 1%, MgO 2%, Li20 2%, TIO2 6%, Na2O 7%-12%, MNO 3%-8%, and B2O3 0-3%.

关 键 词：低碳钢 板坯连铸 保护渣 氟 

分 类 号：TF777.1[冶金工程—钢铁冶金]