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›› 2010, Vol. 10 ›› Issue (6): 1053-1057.

• 过程与工艺 • 上一篇    下一篇

F-对高铝钢连铸保护渣理化性能的影响

于雄 文光华 唐萍 王欢   

  1. 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院 重庆大学材料科学与工程学院
  • 收稿日期:2011-01-11 修回日期:1900-01-01 出版日期:2010-12-20 发布日期:2010-12-20
  • 通讯作者: 文光华

Effect of F- on Physico-chemical Properties of Mold Slag Used for High-Al Steel

YU Xiong WEN Guang-hua TANG Ping WANG Huan   

  1. College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University
  • Received:2011-01-11 Revised:1900-01-01 Online:2010-12-20 Published:2010-12-20
  • Contact: WEN Guang-hua

摘要: 高铝钢连铸过程中,为了避免或减轻钢液中Al与保护渣中SiO2发生反应,设计了低SiO2、高Al2O3含量的高铝钢连铸保护渣,通过添加适量的F-调节熔渣理化性能,实验考察了F-含量对高铝钢保护渣熔点、粘度特性及渣膜传热特性的影响. 结果表明,F-含量在5.8%~8.8%内,渣系中平均增加1%的F-,熔化温度降低4.5℃,保粘度降低0.004 Pa×s;随F-含量增加,渣膜热流密度增加,特征时间降低;对于5.8%和8.8% F-含量保护渣,保护渣最少孕育时间均为6 s,晶体生长需要的最短时间由46 s缩短为30 s;实验条件下,结晶动力学分析表明其按照1维方式生长.

关键词: 高铝钢, 保护渣, 热流, 动力学

Abstract: In order to avoid or alleviate the reaction between Al in liquid steel and SiO2 in slag during the continuous casting of high-Al steel, a new mold slag with low content of SiO2 and high content of Al2O3 was designed. F- was used to adjust the physico-chemical properties of mold slag. The influence of F- content on melting point and viscosity property of slag, and heat flux through slag film in high-Al steel slag was studied by experiment. The results show that the melting point decreased by 4.5℃, and viscosity decreased by 0.004 Pa×s with F- increasing by 1% each time in the range from 5.8% to 8.8%. With the increase of F- content, heat flux through slag film increased, and the characterization time decreased. As for the slag with the F- content of 5.8% and 8.8%, the minimum incubation time of them was both 6 s, but the minimum crystallization time was deduced from 46 s to 30 s. Under this experiment condition, it developed in accordance with one dimension style, based on the analysis of crystallization kinetics.

Key words: high-Al steel, mold slag, heat flux, kinetics