CaO-Al2O3基高铝高锰钢保护渣理化性能研究

以L25(65)正交试验为基础配置CaO-Al_2O_3基保护渣,研究了不同组分对高铝高锰钢保护渣理化性能的影响。结果表明,不同组分对CaO-Al_2O_3基连铸保护渣熔化温度的影响均是随其含量的增加,熔化温度降低,对熔化温度影响的主次顺序为Li_2ONa_2OB_2O_3BaOCaF_2MgO;各不同组分在一定含量范围内,对CaO-Al_2O_3基连铸保护渣黏度整体上均有降低的作用;结晶难易程度由难到易的顺序依次为3#、4#、23#、19#、20#及5#保护渣;利用热力学软件计算得到冷却析出物质中,大部分都含Ca_3B_2O_6,而该物质熔点比较低,且玻璃形态好,不易结晶,可以满足部分高铝高锰钢连铸使用要求。

Study on Physicochemical Properties of CaO-Al2O3 Basis Slag for High Aluminum and Manganese Steel Mold Powder

CaO-Al2O3 based protective slag was prepared based on L25(65) orthogonal experiment. Influence of different components on physical and chemical properties of casting powder of high aluminum and manganese steel was studied and analyzed. The results show that melting temperature of molten slag of CaO-Al2O3-based castings powder drops with increase of different components. The sequence of influence on melting temperature is Li2O>Na2O>B2O3>BaO>CaF2>MgO. Content of each component within a certain range weakens viscosity of CaO-Al2O3-based continuous casting powder. Order of crystallinity of protective slag from difficulty to easiness is No.3, No.4, No.23, No.19, No.20, and No.5. Ca3B2O6, with low melting point, good glass formation and difficulty to crystallize, exists in most cooling precipitates calculated by thermodynamic software and meets the requirement of high aluminum and manganese steel continuous casting.