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Effects of Li2O and Na2O on the Crystallization Behavior of Lime-Alumina-Based Mold Flux for Casting High-Al Steels

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Abstract

With the development of advanced high strength steel (AHSS), a large amount of aluminum was added into steels. The reaction between aluminum in the molten steel and silica based mold flux in the continuous-casting process would tend to cause a series of problems and influence the quality of slabs. To solve the above problems caused by the slag–steel reaction, nonreactive lime-alumina-based mold flux system has been proposed. In this article, the effect of Li2O and Na2O on the crystallization behavior of the lime-alumina-silica-based mold flux has been studied by using the single hot thermocouple technology (SHTT) and double hot thermocouple technology (DHTT). The results indicated that Li2O and Na2O in the above mold flux system play different roles as they behaved in traditional lime-silica based mold flux, which would tend to inhibit general mold flux crystallization by lowering the initial crystallization temperature and increasing incubation time, especially in the high-temperature region. However, when their content exceeds a critical value, the crystallization process of mold fluxes in low temperature zone would be greatly accelerated by the new phase formation of LiAlO2 and Na x Al y Si z O4 crystals, respectively. The crystalline phases precipitated in all samples during the experiments are discussed in the article.

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Acknowledgments

The financial support from NSFC (51274244 and 51322405) and the Fundamental Research Funds for the Central Universities (2011JQ010) is greatly acknowledged.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, P.R. China

    Boxun Lu, Kun Chen (Graduate Student), Wanlin Wang (Professor) & Binbin Jiang (Graduate Student)

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  1. Boxun Lu
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  2. Kun Chen
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  3. Wanlin Wang
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Corresponding author

Correspondence to Wanlin Wang.

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Manuscript submitted November 17, 2013.

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Lu, B., Chen, K., Wang, W. et al. Effects of Li2O and Na2O on the Crystallization Behavior of Lime-Alumina-Based Mold Flux for Casting High-Al Steels. Metall Mater Trans B 45, 1496–1509 (2014). https://doi.org/10.1007/s11663-014-0063-6

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  • DOI: https://doi.org/10.1007/s11663-014-0063-6

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