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Reaction mechanism between Al2O3–MgO refractory materials and rare earth high-carbon heavy rail steel

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Abstract

Submerged entry nozzle (SEN) clogging is a major problem affecting the production quality of rare earth steel, and finding a suitable refractory outlet can significantly reduce production costs. To explore the relationship between refractory composition and interface interaction, unprotected coated Al2O3–MgO refractories and SiO2-coated Al2O3–MgO refractories were added to rare earth high-carbon heavy rail steel under laboratory conditions, and the Al2O3–MgO refractory was found to be more suitable. The results show that, from the epoxy resin side to the refractory side, the contour of the refractory interface reaction layer can be divided into two main layers: an iron-rich reaction layer and an iron-poor reaction layer. Calculations based on the spherical model suggest that the adhesion force is proportional to the size of the refractory particles and inclusions, and the same result applies to the surface tension. Controlling the inclusions at a smaller size has a specific effect on alleviating the erosion of refractories. Combined with the erosion mechanism of Al2O3–MgO refractories, the interface reaction mechanism between Al2O3–MgO refractories and molten steel was proposed, which provides ideas for solving SEN clogging.

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Acknowledgements

The authors expressed their gratitude to the State Key Laboratory of Rare Earth Resources Research and Comprehensive Utilization of Baiyun Obo for the open project (Grant No. 2022 (Kehe) 00281) and the Central Government Guidance Local Science and Technology Development Fund Project (Grant No. 2022ZY0124) for supporting this work. This work was financially supported by the National Natural Science Foundation of China (Grant No. 52074179). In addition, thanks are also given to Wuxi Krosaki Sujia Refractories Co., Ltd., China for providing commercial refractories as experimental materials.

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Authors and Affiliations

  1. Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200444, China

    Yi Wang, Guang-jie Song, Ping Shen & Jian-xun Fu

  2. State Key Laboratory of Baiyunebo Rare Earth Resources Research and Comprehensive Utilization, Baotou, 014030, Inner Mongolia, China

    Jian-zhong He & Da-xian Zhang

  3. Inner Mongolia Baotou Steel Union Co., Ltd., Baotou, 014030, Inner Mongolia, China

    Jian-zhong He & Da-xian Zhang

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  1. Yi Wang
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  2. Guang-jie Song
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Correspondence to Jian-xun Fu.

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Wang, Y., Song, Gj., Shen, P. et al. Reaction mechanism between Al2O3–MgO refractory materials and rare earth high-carbon heavy rail steel. J. Iron Steel Res. Int. 31, 1153–1163 (2024). https://doi.org/10.1007/s42243-023-01147-5

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  • DOI: https://doi.org/10.1007/s42243-023-01147-5

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