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Viscosity and structure of CaO–BaO–SiO2–Al2O3-based mold slags for continuous casting of high titanium steel with different TiO2 absorption

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Abstract

The effect of TiO2 absorption into two different CaO–BaO–SiO2–Al2O3-based mold slags from the steel plant on the viscosity, melting performance and microstructure of slags was investigated through the measurement of the viscosity–temperature relationship, melting temperature and Raman spectroscopy. The parameter of the number of non-bridging oxygen per tetrahedrally-coordinated atom (NBO/T) was also calculated to explain the microstructure variation of molten slags with different TiO2 absorption. The variation of the actual slag consumption and the depth of the liquid slag in mold was explained through the comparison of the viscosity and the melting temperature of two different slags. The viscosity of mold slags (basicity = 0.6) decreased from 1.1 to 0.68 Pa s with the increase in the TiO2 absorption from 0 to 10%, while that of slags (basicity = 0.7) decreased from 0.76 to 0.56 Pa s with the TiO2 absorption from 0 to 6%. The activation energy of both two groups of slags had the tendency to decrease with the increasing TiO2 absorption. The network structure of both two groups of slags measured by the Raman spectra showed that the fraction of complex structure units (Q1, Q2, Q3 and Al–O–Al) decreased and simple structure units (Al–O− and Q0) increased with the increase in TiO2 absorption. NBO/T also increased with the increase in the TiO2 absorption, indicating that the absorption of TiO2 into slags resulted in the destruction of silicate/aluminate structure. Hence, the absorption of TiO2 into the current CaO–BaO–SiO2–Al2O3 mold slags decreased the degree of polymerization of these slags and then led to the decrease of viscosity.

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Acknowledgements

The authors are grateful for support from the National Natural Science Foundation China (Grant Nos. 52274317, 52074054, and 52004045), the Fundamental Research Funds for the Central Universities (Grant No. 2023CDJXY-020), and College of Materials Science and Engineering at Chongqing University, China, and the Henan Tongyu Metallurgy Materials Group Co. Ltd., Xixia, China.

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  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Ya-tao Cui, Xue-you Wang, Xu-bin Zhang, Qiang-qiang Wang & Sheng-ping He

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  1. Ya-tao Cui
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Correspondence to Xu-bin Zhang.

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Cui, Yt., Wang, Xy., Zhang, Xb. et al. Viscosity and structure of CaO–BaO–SiO2–Al2O3-based mold slags for continuous casting of high titanium steel with different TiO2 absorption. J. Iron Steel Res. Int. (2024). https://doi.org/10.1007/s42243-024-01176-8

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