Abstract
Cleanliness of aluminum-killed ultra-low carbon steel produced through BOF-RH-CC and BOF-LF-RH-CC was comparatively investigated by various test equipment. Three different heating processes were used when the converter tapping temperature was low: reheating by blowing oxygen and Al addition during RH early decarburization stage (Process-A); reheating by blowing oxygen and Al particles addition at the end of RH decarburization (Process-B); and no Al addition at RH decarburization stage but the process was BOF-LF-RH-CC (Process-C). The non-metallic inclusions can be removed obviously in three refining processes. Statistical analysis of inclusion area fraction showed Process-A was substantially less than those in Process-B. Furthermore, the proportion of single inclusion area <8 μm2 increased from Process-A level 85% to Process-C level 95%. Moreover, this study proposed an XGBoost model based on big data mining methods to investigate the computational simulation and the introduction of the XGBoost model ensured 90% accuracy rate for seeking an optimum refining process.
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Acknowledgements
This work was financially supported by National Key R&D Program of China (2017YFB0304000).
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Song, Sy., Li, J., Yan, W., Zhang, Jx. (2022). Comparative Study on the Cleanliness of Ultra-Low Carbon Al-Killed Steel by Different Heating Processes. 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_15
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DOI: https://doi.org/10.1007/978-3-030-92388-4_15
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