高铝钢用保护渣结晶行为  

Crystallization behavior of mold flux for high aluminum steel

作　　者：李欢 杨红岗[1,2] 翟俊[1,2] 周乐君[3] LI Huan;YANG Hong-gang;ZHAI Jun;ZHOU Le-jun(State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Ironand Steel(Group)Co.,Ltd.,Taiyuan 030003,Shanxi,China;Technology Center,Shanxi Taiyuan Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China;School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]太原钢铁(集团)有限公司先进不锈钢材料国家重点实验室,山西太原030003 [2]山西太钢不锈钢股份有限公司技术中心,山西太原030003 [3]中南大学冶金与环境学院,湖南长沙410083

出　　处：《连铸》2021年第2期25-32,47,共9页Continuous Casting

摘　　要：结晶特性是保护渣最重要的理化指标之一,直接影响着连铸坯表面质量和连铸顺行。以高铝钢用传统低碱度CaO-SiO_(2)系和新型CaO-Al_(2)O_(3)系保护渣为对象,采用单丝热电偶技术和扫描电镜对保护渣液相结晶/玻璃相结晶的结晶温度、演变过程和微观形貌进行了研究。结果表明,液相结晶过程中CaO-Al_(2)O_(3)系保护渣更容易结晶,而玻璃相结晶过程中CaO-SiO_(2)系保护渣更容易析出晶体。此外,上述两种保护渣均具有较快的液相结晶速度,且液相结晶与玻璃相结晶的生长方式和形貌存在明显差异。Crystallization characteristic is one of the most important physical and chemical indexes of mold flux,which directly affects the surface quality of continuous casting billet and the running of continuous casting.The traditional low basicity CaO-SiO_(2) system and new CaO-Al_(2)O_(3) system mold fluxes for high aluminum steel were used as research objects.The crystallization temperature,evolution process and micro morphology of liquid phase crystallization/glass phase crystallization of mold fluxes were studied by using SHTT technology and scanning electron microscope.The research results show that CaO-Al_(2)O_(3) system is easier to crystallize during the liquid phase crystallization process,while CaO-SiO_(2) system is easier to crystallize during the glass phase crystallization process.The liquid phase crystallization speed of the two mold fluxes is faster,and there are also obvious differences in the growth mode and morphology of the liquid phase crystal and the glass phase crystal.

关 键 词：高铝钢 保护渣 液相结晶 玻璃相结晶 形核生长 

分 类 号：TF777[冶金工程—钢铁冶金]