Inclusion Evolution for SPCC in JISCO During CSP Process
In present manuscript,the evolution of inclusion for SPCC during CSP process was studied for inclusion control.Steel samples were taken at the converter endpoint,the start,intermediate and end of LF,tundish and casting slab respectively.In addition,SEM-EDS was applied to explore inclusion information such as morphology,size and composition in the samples.Inclusion observed at BOF endpoint is of multi-component inclusion with large size(>5um) which is usually removed during tapping.At the start and the middle of LF,inclusions observed are mainly Al2O3 inclusion with irregular morphology as well as some MgO Al2O3 spinel inclusion.After Ca-treatment,inclusions were modified into Alumina Calcium multi-component inclusions.The inclusions in slab are universally larger than that in LF and tundish.Furthermore,it was found that inclusions with lower melting point were of smaller diameter and higher spherical rate,which meant the size and morphology of inclusions can be controlled by inclusion composition control.Finally,the mechanism of inclusion modification was analyzed by SEM-Mapping.The multi-component inclusions surrounded by CaO or CaS ring were both detected while their forming mechanism were different.The former is due to the chemical reaction between Ca and MgO·Al2O3 spinel with reducing the Mg in spinel and the latter is because CaS precipitates in solidification due to the segregation of S and temperature decrease.
inclusion CSP process modification Ca-treatment
CHENG Zi-jian GUO Jing CHENG Shu-sen
State Key Laboratory of Advanced Metallurgy&School of metallurgy and ecology engineering,University State Key Laboratory of Advanced Metallurgy&School of metallurgy and ecology engineering,University
国际会议
Asia Steel International conference 2012(第五届亚洲钢铁大会)
北京
英文
1-6
2012-09-23（万方平台首次上网日期，不代表论文的发表时间）