Analysis on clogging of submerged entry nozzle in continuous casting of high strength steel with rare earth  

作　　者：Wei Liang Jing Li Bin Lu Jian-guo Zhi Shuai Zhang Yang Liu 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China [2]Inner Mongolia Baotou Steel Union Co.,Ltd.,Baotou 014010,Inner Mongolia,China

出　　处：《Journal of Iron and Steel Research International》2022年第1期34-43,共10页

基　　金：the financial support of the Natural Science Foundation of Inner Mongolia Autonomous Region of China(No.2020MS0517);Science and Technology Project of Inner Mongolia Autonomous Region of China(No.2020GG0109).

摘　　要：The type of inclusions in tundish steel and the formation mechanism of the submerged entry nozzle(SEN)clogging in the continuous casting of the rare earth(RE)high strength steel without calcium treatment were studied based on the plant trials and thermodynamic calculation.It was found that Ce_(2)O_(3) and CeAlO_(3) in tundish molten steel were transformed into Ce_(2)O_(2)S+CaO-Al_(2)O_(3) with the size of 2-3 lm during cooling.When the flow velocity of molten steel on surface of the SEN was slow due to the boundary layer effect,Ce_(2)O_(3) inclusion in molten steel reacted with Al_(2)O_(3) in the SEN refractory to form CeAlO3.With the continuous erosion of molten steel and reaction,the compositions of CeAlO_(3),Al_(2)O_(3) and CaO were aggregated,and the clogging layers with different zones were formed on surface of the SEN.Meanwhile,a small amount of molten steel remaining in the arc zone and corner zone of the SEN formed solidified steel.When calcium treatment is canceled,the reaction probability between inclusions in molten steel and refractory should be reduced by improving the material and shape of the SEN.

关 键 词：Rare earth inclusion TUNDISH Submerged entry nozzle CLOGGING Thermodynamic calculation 

分 类 号：TF777[冶金工程—钢铁冶金]