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Formation mechanism of interface reaction layer between microporous magnesia refractories and molten steel and its effect on steel cleanliness

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Abstract

The ceramic filter in continuous casting tundish can effectively improve the cleanliness of high-performance steel by regulating tundish flow field to promote the removal of inclusions and adsorbing or blocking fine inclusions in the molten steel into the mold. The interaction between microporous magnesia refractories used as tundish filter and molten interstitial-free (IF) steel at 1873 K was investigated to reveal the formation mechanism of their interface layer and its effect on steel cleanliness by laboratory research and thermodynamic calculations. The results show that the magnesium–aluminum spinel layer at the interface between the molten IF steel and the microporous magnesia refractories is formed mainly by the reaction of MgO in the refractory with the [Al] and [O] in the molten steel, significantly reducing the total O content, the size and amount of inclusions of the molten steel. In addition, the interparticle phases of microporous magnesia refractories at high temperature can adsorb Al2O3 and TiO2 inclusions in the molten steel into interparticle channels of the refractories to form high melting point spinel, impeding the further penetration of the molten steel. As a result, the consecutive interface layer of high melting point spinel between microporous magnesia refractories and molten steel can improve the cleanliness of the molten steel by adsorbing inclusions in the molten steel and avoid the direct dissolution of refractories of the tundish ceramic filter immersed in the molten steel, increasing their service life.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (Nos. U1860205 and 52174323) and Innovation Team Cultivation Funding Project of Wuhan University of Science and Technology (2018TDX08).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Wen-wen Zhang, Wan Zheng, Wen Yan & Guang-qiang Li

  2. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Wen-wen Zhang & Guang-qiang Li

  3. Hubei Provincial Key Laboratory for New Process of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Wan Zheng

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  1. Wen-wen Zhang
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Correspondence to Wan Zheng.

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Zhang, Ww., Zheng, W., Yan, W. et al. Formation mechanism of interface reaction layer between microporous magnesia refractories and molten steel and its effect on steel cleanliness. J. Iron Steel Res. Int. 30, 1743–1754 (2023). https://doi.org/10.1007/s42243-022-00889-y

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