摘要
通过SEM、EDS、CSLM等手段考察了薄带连铸低碳钢表面夹渣的形貌、组成、含量、来源及熔点特性,探讨了表面夹渣缺陷的形成机制。结果表明,表面夹渣主要由3部分组成:ZrO2、MgAl2O4、Al2O3-SiO2-MnO三元复合氧化物,其各自占比分别为3.8%、7.3%、88.7%;通过CSLM高温加热的方法,可以观察到高熔点夹渣和低熔点夹渣分离的现象,证实了表面夹渣中Al2O3-SiO2-MnO三元复合氧化物未能全部控制在低熔点区域。在薄带连铸浇铸硅锰脱氧低碳钢时,低熔点的Al2O3-SiO2-MnO液态氧化物成为高熔点夹杂物颗粒之间的'液桥',该液体连接桥会对高熔点夹杂物颗粒形成聚集力和聚集效应,从而使夹杂物颗粒聚集长大,这是薄带连铸低碳钢形成表面夹渣缺陷的主要内因。
The morphology,composition,content,source and melting point characteristics of slag on low carbon steel surface by thin-strip casting were investigated by SEM,EDS and CSLM.Results show that the surface slag is mainly composed of three parts:ZrO2,MgAl2O4 and Al2O3-SiO2-MnO ternary composite oxides,which account for 3.8%,7.3%,88.7%respectively;The separation phenomenon of high melting point slag and low melting point slag can be observed by CSLM high temperature heating method,and it is proved that the Al2O3-SiO2-MnO ternary composite oxides in the surface slag are not all controlled in the low melting point region.When thin-strip casting Si-Mn deoxidation steel,Al2O3-SiO2-MnO liquid oxides with low melting point become the'liquid connection bridge'among the high melting point inclusions particles,then the aggregation force and aggregation effect formed by the liquid connection bridge to the high melting point inclusion particles,so that the inclusion particles are gathered and grown up.This is the main internal reason for the formation of slag on low carbon steel surface by thin-strip casting.
作者
吴建春
方园
陈先锋
WU Jian-chun;FANG Yuan;CHEN Xian-feng(Advanced Technology Div.,Central Research Institute of Baowu Group,Shanghai 201900,China;Shanghai Engineering Research Center of Strip Casting and Rolling,Shanghai 201900,China;Strip Casting and Rolling Mill,Ningbo Iron and Steel Co.,Ltd.,Ningbo 315800,Zhejiang,China)
出处
《连铸》
2019年第4期26-35,共10页
Continuous Casting
基金
上海薄带连铸连轧工程技术研究中心资助项目(11DZ2282300)
关键词
薄带连铸
低碳钢
表面夹渣
形成机制
液桥
strip casting
low carbon steel
surface slag
formation mechanism
liquid connection bridge
