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Characteristics of Nozzle Clogging and Evolution of Oxide Inclusion for Al-Killed Ti-Stabilized 18Cr Stainless Steel

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Abstract

Characteristics of nozzle clogging and evolution of oxide inclusion were studied by sampling the deposits of submerged entry nozzle (SEN) and the molten steel in tundish during Al-killed Ti-stabilized 18Cr stainless steelmaking process. The deposits found in the clogging of SEN were mainly composed of frozen steel and inclusions. The inclusions in the deposits and tundish were both mainly (MgO-Al2O3)rich-CaO-TiOx. The compositions of most inclusions were Liquid+Spinel or Liquid+TiSp phase. The (MgO-Al2O3)rich-CaO inclusions that were not effectively modified by calcium treatment could be a source of clogging. By combining both the experimental results and thermodynamic calculation, (MgO-Al2O3)rich-TiOx inclusions (TiSp inclusions) would be formed with the decreasing temperature in steel during continuous casting, which could be transported and accumulated on the inner wall of the SEN. Increasing the calcium content in the molten steel could decrease the formation of TiSp inclusions. During continuous casting, these inclusions accumulated on the inner wall of the SEN and gradually formed porous network of clog. Molten steel would gradually solidify in the porous space of the clog due to the increased residence time of the molten steel when flowing through it. The clogging gradually increased and caused the shutdown of continuous casting.

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Acknowledgments

The authors gratefully express their appreciation to the National Natural Science Foundation of China (Grant No. 51374020), the State Key Laboratory of Advanced Metallurgy at the University of Science and Technology Beijing (USTB), and to Jiuquan Iron and Steel Co. for supporting this study.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Jingyu Li & Guoguang Cheng

  2. Hongxing Iron & Steel Jiuquan Iron and Steel Co., Ltd., Jiayuguan, 735100, Gansu, P.R. China

    Qiang Ruan, Jixiang Pan & Xingrun Chen

Authors
  1. Jingyu Li
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  2. Guoguang Cheng
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  3. Qiang Ruan
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Correspondence to Jingyu Li.

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Manuscript submitted May 6, 2019.

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Li, J., Cheng, G., Ruan, Q. et al. Characteristics of Nozzle Clogging and Evolution of Oxide Inclusion for Al-Killed Ti-Stabilized 18Cr Stainless Steel. Metall Mater Trans B 50, 2769–2779 (2019). https://doi.org/10.1007/s11663-019-01708-8

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  • DOI: https://doi.org/10.1007/s11663-019-01708-8

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