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Effects of FeO and CaO/Al2O3 Ratio in Slag on the Cleanliness of Al-Killed Steel

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Abstract

The slag composition plays a critical role in the formation of inclusions and the cleanliness of steel. In this study, the effects of FeO content and the C/A (CaO/Al2O3) ratio in the slag on the formation of inclusions were investigated based on a 10-minute slag–steel reaction in a MgO crucible. The FeO content in the top slag was shown to have a significant effect on the formation of MgO·Al2O3 spinel inclusions, and critical content exists; when the initial FeO content in the slag was less than 2 pct, MgO·Al2O3 spinel inclusions formed, and the T.O (total oxygen) was 20 ppm; when the initial FeO content in the slag was more than 4 pct, only Al2O3 inclusions were observed and the T.O was 50 ppm. It was clarified that the main source of Mg for the MgO·Al2O3 spinel inclusion formation was the top slag rather than the MgO crucible. In addition, the cleanliness of the steel increased as the initial FeO content in the top slag decreased. As regards the effects of the C/A ratio, the MgO amount in the observed inclusions gradually increased, whereas the T.O content decreased gradually with the increasing C/A ratio. Slag with a composition close to the CaO-saturated region had the best effect on the inclusion absorption.

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Acknowledgments

The authors are grateful for financial support from the National Key R&D Program of China (2017YFB0304000 & 2017YFB0304001).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, P.R. China

    Yunqing Ji, Huixiang Yu & Xinhua Wang

  2. Department of Metallurgy, Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan

    Chunyang Liu & Yan Lu

  3. Steelmaking Plant of Beijing Shougang Co., Ltd., Qian’an, 100041, Hebei, P.R. China

    Fuxiang Huang

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  1. Yunqing Ji
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  2. Chunyang Liu
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  3. Yan Lu
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  4. Huixiang Yu
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  5. Fuxiang Huang
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  6. Xinhua Wang
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Correspondence to Huixiang Yu.

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Manuscript submitted May 1, 2018.

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Ji, Y., Liu, C., Lu, Y. et al. Effects of FeO and CaO/Al2O3 Ratio in Slag on the Cleanliness of Al-Killed Steel. Metall Mater Trans B 49, 3127–3136 (2018). https://doi.org/10.1007/s11663-018-1397-2

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  • DOI: https://doi.org/10.1007/s11663-018-1397-2

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