中碳钢板坯保护渣结晶性能的优化  

Optimization of crystallization properties of mold flux for slab casting of medium-carbon steel

作　　者：景财良[1] 尹娜[1] 赵紫锋[1] 张炯明[1] 王新华[1] 王万军[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083

出　　处：《北京科技大学学报》2009年第S1期28-31,共4页Journal of University of Science and Technology Beijing

摘　　要：选取常规用保护渣和高拉速用优化保护渣研究了其高温结晶性能与玻璃质渣膜回温结晶性能.研究表明,优化后的高碱度保护渣具有较高的结晶温度和较低的脱玻化温度,同等实验条件下析晶能力更强,结晶相主要为枪晶石(3CaO.2SiO2.CaF2),并且晶粒粗大,凝固组织中有大量空隙,渣膜表面粗糙度大,有利于增加渣膜热阻,更适合于高拉速生产.The crystallization capability at high temperature and devitrification properties of glassy films in annealing of routine and optimized high-speed casting mold flux were studied. The results show that the optimized mold flux with high basicity has a higher crystallization temperature and a lower devitrified temperature;also,its crystal-forming abilitiy is much stronger in the same conditions. The main crystal phase of the optimized mold flux is Cuspidine(3CaO·2SiO2·CaF2)and it has larger crystalline particles. Moreover,there are a great number of gaps in the solidification structure,which can increase the roughness on the surface of flux films. Consequently,it can enhance the heat resistance of flux films and will be more suitable for high-speed casting.

关 键 词：中碳钢 结晶性能 脱玻化 

分 类 号：TF777[冶金工程—钢铁冶金]