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›› 2014, Vol. 14 ›› Issue (3): 500-505.

• 材料工程专栏 • 上一篇    下一篇

CaO/Al2O3比对高铝钢连铸保护渣凝固结晶行为的影响

刘奇 谭文奉 周振宇 黄雅萍 唐萍 文光华   

  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 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:2014-06-19 修回日期:1900-01-01 出版日期:2014-06-20 发布日期:2014-06-20
  • 通讯作者: 文光华

Effect of CaO/Al2O3 Ratio on Solidification and Crystallization Behavior of Mold Fluxes for High-Al Steel

LIU Qi TAN Wen-feng ZHOU Zhen-yu HUANG Ya-ping TANG Ping WEN Guang-hua   

  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 College of Materials Science and Engineering, Chongqing University College of Materials Science and Engineering, Chongqing University
  • Received:2014-06-19 Revised:1900-01-01 Online:2014-06-20 Published:2014-06-20
  • Contact: WEN Guang-hua

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被引次数

7

摘要： 针对目前高铝钢用常规结晶器保护渣中SiO2易被钢液中Al还原导致连铸坯质量缺陷及非反应性保护渣消耗量偏低和润滑差的问题，基于CaO-SiO2-Al2O3三元系相图设计了SiO2含量为20%(w)的CaO-SiO2-Al2O3连铸保护渣，并采用热丝法模拟研究了CaO/Al2O3比对该渣系凝固结晶行为的影响. 结果表明，随CaO/Al2O3比的增加，保护渣的结晶性能增强；CaO/Al2O3比在0.7~1.3范围内其凝固固相分数较小，与现用工业渣具有相似的润滑作用. 综合考虑保护渣的传热和润滑作用，高铝钢保护渣中CaO/Al2O3比范围应为0.7~1.3.

关键词: 高铝钢, 结晶器保护渣, CaO-SiO2-Al2O3渣系, CaO/Al2O3比, 凝固, 结晶

Abstract: For the current problems that SiO2 in conventional mold flux for high-Al steel production can be easily reduced by Al in liquid steel, causing quality defects for the continuous casting strand, and the non-reactive mold flux has disadvantages of low consumption and poor lubrication, based on the phase diagram of CaO-SiO2-Al2O3 ternary system, the CaO-SiO2-Al2O3 mold flux with 20%(w) SiO2 was designed, and the effect of mass ratio of CaO to Al2O3 (C/A) on the solidification and crystallization behavior of experimental slag simulated by hot thermocouple technique examined. The results showed that the crystallization tendency of mold fluxes was enhanced with increasing of C/A, and the mold flux with C/A from 0.7 to 1.3 had smaller solidification fraction and expected to have the similar lubrication action with the conventional mold flux. Comprehensively considering the heat transfer and lubrication, the C/A of mold flux for high-Al steel should be in the range from 0.7 to 1.3.

Key words: high-Al steel, mold flux, CaO-SiO2-Al2O3 slag system, CaO/Al2O3 ratio, solidification, crystallization

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