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Characteristics of SEN clogging and adhesive behavior of oxide inclusion during continuous casting of Ti-stabilized ultra-pure ferritic stainless steels

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Abstract

Submerged entry nozzle (SEN) clogging during continuous casting of Ti-stabilized ultra-pure ferritic stainless (Ti-UPFS) steels was systematically investigated via cross-sectional analysis and acid dissolution treatment. The SEN deposit profile was characterized as occurring in three major layers: (1) an eroded refractory layer; (2) an initial adhesive layer comprised  an Al2O3–ZrO2 composite sub-layer and a dense Al2O3-based deposit sub-layer; and (3) a porous multiphase deposit layer mainly consisting of MgO·Al2O3, CaO–Al2O3, and CaO–TiOx. The MgO·Al2O3-rich inclusions did not adhere directly to the eroded refractory but were entrapped during the deposit growth. Results of inclusion characterization in the tundish revealed that the MgO·Al2O3-rich particles present in the tundish served as the primary source of clogging deposits. Furthermore, a novel cavity-induced adhesion model by circular approximation was established to explain the effects of complex inclusion characteristics and refractory material type on adhesion force. A high number of small MgO·Al2O3 inclusions were expected to accelerate the buildup of clogging deposits. Improving the modification of MgO·Al2O3-rich inclusions in the size range of 2–4 µm by Ca treatment was crucial to minimizing the risk of SEN clogging during the continuous casting of Ti-UPFS steels.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51574026).

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Xue-feng Bai, Yan-hui Sun & Hui-bin Wu

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  1. Xue-feng Bai
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Correspondence to Yan-hui Sun.

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Bai, Xf., Sun, Yh. & Wu, Hb. Characteristics of SEN clogging and adhesive behavior of oxide inclusion during continuous casting of Ti-stabilized ultra-pure ferritic stainless steels. J. Iron Steel Res. Int. 30, 1939–1951 (2023). https://doi.org/10.1007/s42243-022-00858-5

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