Quantitative characterization of reaction behavior between La-bearing FeCrAl melt and CaO–Al_(2)O_(3)–La_(2)O_(3)-based slags and its guidance for design of mold flux  

作　　者：Lei Fan Tian-peng Qu De-yong Wang Cheng-jun Liu 

机构地区：[1]School of Iron and Steel,Soochow University,Suzhou,215000,Jiangsu,China [2]School of Metallurgy,Northeastern University,Shenyang,110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2025年第3期646-658,共13页钢铁研究学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52174321,52274339 and 52074186).

摘　　要：The reaction behavior between CaO–Al_(2)O_(3)–La_(2)O_(3)-based slags and La-bearing FeCrAl melt was quantitatively characterized,which was further compared with the reaction behavior of CaO–SiO_(2)-based slags.Based on this,the new type of mold flux for La-bearing FeCrAl alloy continuous casting was designed and its basic properties were evaluated.The results showed that the order of reaction degree of fluxing agents in CaO–Al_(2)O_(3)–La_(2)O_(3)-based slags is(Na_(2)O)>(B_(2)O_(3))>(Li_(2)O),and the percentages of mass change of fluxing agents were 85.8,54.29 and 42.35 wt.%,respectively.Moreover,the addition of(Li_(2)O)and(Na_(2)O)promoted the reaction between(CaO)and[Al],and the reaction degree of the former was weaker than that of the latter,which was due to the greater effect of(Na_(2)O)on the activity of(CaO)and(Al_(2)O_(3))than(Li_(2)O).Compared with the reactivity of CaO–SiO_(2)-based slags,the percentages of mass change of Al and La caused by slag–steel reaction decreased by 10.63–14.36 and 39.78–50.49 wt.%,respectively.The percentages of mass change of(Al_(2)O_(3)),(La_(2)O_(3))and(CaO)in slags highest increased by 17.71,17.98,and 7.81 wt.%,respectively.The reactivity of CaO–Al_(2)O_(3)–La_(2)O_(3)-based slags was significantly weakened.Ultimately,the new type of mold flux was designed and the composition range was determined.The fundamental properties of new mold flux basically meet the theoretical requirements for La-bearing FeCrAl alloy continuous casting.

关 键 词：La-bearing FeCrAl melt CaO-Al_(2)O_(3)-La_(2)O_(3)-based slag Reaction behavior Quantitative characterization Mold flux design 

分 类 号：TF777[冶金工程—钢铁冶金]