Abstract
To better understand the clogging mechanism of the submerged entry nozzle, clogging materials were analyzed using scanning electron microscopy and energy dispersive spectrometer. The clogging material was divided into several layers, including the alumina inclusion layer, solidified steel layer, and nozzle matrix layer. Due to the difference in the morphology and composition of oxides, observed clogging materials presented different morphologies. Steel droplets were observed at the interface between the nozzle and the clogging materials, indicating that insufficient preheating may lead to the solidification of the molten steel. Alumina inclusions were easy to adhere to the solidified steel layer, which was the starting of the nozzle clogging behavior. The alumina inclusions continuously collided and sintered, resulting in the formation of the alumina inclusion layer. Besides, the reoxidation might also lead to the clogging of the submerged entry nozzle of Al-killed steels.
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Acknowledgements
The authors are grateful for support from the National Nature Science Foundation of China (Grant No. U1860206, No. 51725402), the S&T Program of Hebei (Grant No. 20311004D, 20591001D), the High Steel Center (HSC) at Yanshan University, and Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM) and the High Quality Steel Consortium (HQSC) at University of Science and Technology Beijing (USTB), China.
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Liu, F., Zhou, Q., Zhang, L., Ren, Y. (2022). Observation on Clogging Behavior of Submerged Entry Nozzle of Al–Killed Steels. In: Peng, Z., et al. 12th International Symposium on High-Temperature Metallurgical Processing. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-92388-4_28
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DOI: https://doi.org/10.1007/978-3-030-92388-4_28
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