Solidification Properties of CaO-SiO_2-TiO_2 Based Mold Fluxes

作     者：HE Sheng-ping HUANG Qing-yun ZHANG Guo-xing LU Yong-jian WANG Qian 

作者机构：Chongqing Key Laboratory of Metallurgical Engineering College of Materials Science and EngineeringChongqing University Chongqing 400044 China 

出 版 物：《Journal of Iron and Steel Research International》 (Journal of Iron and Steel Research)

年 卷 期：2011年第18卷第7期

页      面：15-19,52页

核心收录：

学科分类：081702[工学-化学工艺] 080602[工学-钢铁冶金] 0806[工学-冶金工程] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Item Sponsored by National Natural Science Foundation of China(50904083) 

主　　题：mold flux solidification property peritectic steel mineragraphy 

摘      要：In continuous casting of peritectic steel grades sensitive to longitudinal cracking, the solidification properties of mold fluxes play an important role in keeping smooth running of continuous casting process and achieving high surface quality of casting strands. To reduce fluorine pollution in molten slag, types of CaO-SiO2-TiO2 （CTS） based mold fluxes were investigated. The solidification and crystallization properties, including viscosity η at 1 573 K, break temperature Tbr, crystallization ratio Rc and solidification mineragraphy were measured, which were compared with those of CaO-SiO2-CaF2 based mold fluxes. The experiments show that there are unstable viscosity-high tem- perature properties and high Tbr in part of CTS slag system, which are bad for lubrication between liquid flux film and strand. And when temperature is below Tbr, the viscosities change slowly during cooling in some part of this slag system, which imply that liquid mold fluxes solidify slowly and it is easy to cause surface longitudinal cracks on strand. Major mineragraphy of the CaO-SiO2-TiO2 based mold fluxes are CaO · TiO2 or CaO · TiO2 and CaO · SiO2 · TiO2. TiN and Ti（C,N） can be formed in mold fluxes bearing high TiO2 during the continuous casting.