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高铝钢连铸会发生剧烈的钢渣界面反应，影响连铸顺行。为了抑制钢渣反应，开发低反应性保护渣已成为高铝钢保护渣研究的重要方向，而不同工艺类型高铝钢对保护渣性能有着各异的要求。因此使用高温物性综合测定仪和偏光显微镜，系统研究了高铝钢圆坯和方坯传统保护渣的理化性能及渣膜矿相导热性能，为设计性能更加稳定的高铝钢低反应性保护渣奠定了基础。研究结果表明，高铝钢圆坯和方坯保护渣都具有低碱度、低熔点和低黏度的特性，圆坯保护渣的熔点和黏度相对更低。圆坯保护渣的结晶温度为1 250℃，而方坯保护渣的结晶温度为1200℃。它们的临界冷却速率分别为10℃/s和7℃/s。圆坯和方坯渣膜的结晶矿物都以枪晶石和霞石为主，方坯渣膜结晶率在50%左右，圆坯渣膜结晶率则高达70%以上。在100℃～300℃的温度范围内，圆坯和方坯的渣膜导热系数集中在0.35～0.8 W·(mK)-1，圆坯渣膜的导热系数低至0.5 W·(mK)-1以下，控制传热的能力较好。
Abstract：The continuous casting of high-alumina steel will undergo a violent steel slag interface reaction,which will affect the continuous casting anterograde.In order to inhibit the reaction of steel slag,the development of low reactivity mold flux has become an important direction in the research of mold flux for high alumina steel,and different process types of high alumina steel have different requirements for the performance of mold flux.Therefore,the physical and chemical properties and the thermal conductivity of the slag membrane mineral phase of the traditional mold flux of high-alumina steel round billet and billet were systematically studied by using a high-temperature comprehensive physical property tester and polarizing microscope,which laid a foundation for the design of low-reactivity mold flux of high-alumina steel with more stable performance.The research results show that high alumina steel round billet and billet mold flux have the characteristics of low alkalinity,low melting point and low viscosity,and the melting point and viscosity of round billet mold flux are relatively lower.The crystallization temperature of round billet mold flux is 1 250℃,while that of billet mold flux is 1 200℃.Their critical cooling rates are 10℃/s and 7°C/s,respectively.Round billet and billet slag film of crystalline minerals are mainly cuspidine and nepheline,billet slag film crystallization rate of about 50%,round billet slag film crystallization rate is as high as 70%or more.In the temperature range of 100℃ to 300℃,the thermal conductivity of the round billet and billet slag film is concentrated in the range of 0.35 to 0.8 W·(mK)-1,and the thermal conductivity of the round billet slag film is as low as 0.5 W·(mK)-1,and the ability to control heat transfer is better.
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基本信息:
DOI：
中图分类号:TF777
引用信息:
[1]孙昌奇,刘磊,韩秀丽等.高铝钢圆坯和方坯保护渣性能及渣膜矿相[J].华北理工大学学报(自然科学版),2025,47(02):20-28+46.
基金信息:
河北省自然科学基金面上项目（E2024209062）：基于微观结构重构的无氟保护渣宏观性能调控研究; 唐山市科技计划项目（24130206C）：含硼无氟保护渣的熔化结晶行为与润滑传热机理