高铝钢用低Li_2O保护渣的开发研究  

Investigation on development of low-Li_2O mold fluxes used for high aluminum steel

作　　者：张晨[1] 蔡得祥[1] 

机构地区：[1]宝山钢铁股份有限公司研究院,上海201900

出　　处：《炼钢》2017年第3期51-55,77,共6页Steelmaking

摘　　要：针对Al质量分数为0.6%的汽车双相高强钢用保护渣Li_2O含量高、成本高的问题,研究开发了无Li_2O和低含量Li_2O(2%)2种新的保护渣,对工业化多炉连浇生产试验过程中的熔渣性能变化进行了评价,并分析了渣膜结构、高温析晶行为对结晶器综合传热系数的影响。结果表明,2种试验保护渣生产的铸坯质量均达到了预期效果,但无Li_2O的高碱度保护渣使用过程黏度上升幅度偏高,润滑性能不稳定,连铸过程稳定性较差;加入质量分数2%的Li_2O,增加了保护渣使用过程中的稳定性,实现了多炉连浇的正常应用,而由于保护渣析晶能力相对弱,结晶器的综合传热系数高于目前的高Li_2O保护渣,还须进行后续的进一步优化。For mold fluxes used for the dual phase high strength automobile steel with 0.6 % A1, the addition of high content of Li2O leads to the high cost of production. This study developed two kinds of mold fluxes, including mold flux with no Li2O and mold flux with 2 % Li2O. Industrial trials for continuous casting of several heats were carried out to evaluate the properties of mold fluxes in mold. The effects of structure of mold slag film and the crystallization behavior of mold flux under high temperature on the heat transfer coefficient were analyzed. The results indicated that the expected effect of slab quality was realized when the two kinds of mold fluxes were used. However, when the mold flux with no Li2 0 was used for casting, the viscosity of mold flux increased sharply after reaction,which resulted in poor lubrication and variable behavior. When 2 % mass fraction Li2O was added into mold flux, the behavior of mold flux was stable, which was helpful for realizing sequence casting. Compared with mold flux with high Li2O, the crystallization ability of mold flux with low Li2O was inhibited,leading to the higher heat transfer coefficient. Therefore, the properties of mold flux with low Li2O needs further optimization.

关 键 词：高铝钢 连铸 保护渣 LI2O 

分 类 号：TF777.1[冶金工程—钢铁冶金]