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Evolution of Inclusions in Fe-13Cr Treated by CaO-SiO2-Al2O3-Based Top Slag

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Abstract

Experiments were carried out to determine the effect of Al2O3 in the slag of the CaO-SiO2-Al2O3-MgO-CaF2 system on the cleanness of Fe-13Cr stainless steel deoxidized by ferrosilicon. Increasing the Al2O3 content in basicity = 2.28 slag can reduce the usage of CaF2 and benefit the obtainment of a good kinetic condition for inclusion removal, but over 21 pct would lead to a higher total oxygen content in the melt and make the inclusion composition more complex. It is found that increasing basicity in 16 pct Al2O3 slag would have a good deoxidation ability and accelerate the transformation from high Al2O3 inclusions to low melting point CaO-Al2O3-SiO2-MgO system inclusions, but basicity over 2.58 would lead to high content of [Al] in liquid steel, which would promote the formation of MgO-Al2O3 inclusions. Therefore, it is not suitable to add a high content of Al2O3 into high-basicity slag. Adding Al2O3 into slag of 2.28 in basicity until a content of 16 pct could achieve inclusion plastication within 45 minutes without Ca treatment, which has potential application in industrial production.

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Acknowledgments

The authors express their appreciation to the National Nature Science Foundation of China (Grant Nos. 51104013, 51174022, and 51374020), the Fundamental Research Funds for the Central Universities (Grant No. FRF-TP-15-052A3), the Beijing Higher Education Young Elite Teacher Project (Grant No. YETP0349), and the China Postdoctoral Science Foundation (Grant No. 2014M560046).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 10083, People’s Republic of China

    Qi Wang, Lijun Wang & Kuo-Chih Chou

  2. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 10083, People’s Republic of China

    Qi Wang, Lijun Wang & Kuo-Chih Chou

  3. Technical Center, Taiyuan Iron and Steel (Group) Co., Ltd, Taiyuan, 030003, Shanxi, People’s Republic of China

    Jun Zhai & Jianmin Li

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  1. Qi Wang
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  2. Lijun Wang
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  3. Jun Zhai
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  4. Jianmin Li
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  5. Kuo-Chih Chou
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Correspondence to Lijun Wang.

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Manuscript submitted June 7, 2016.

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Wang, Q., Wang, L., Zhai, J. et al. Evolution of Inclusions in Fe-13Cr Treated by CaO-SiO2-Al2O3-Based Top Slag. Metall Mater Trans B 48, 564–572 (2017). https://doi.org/10.1007/s11663-016-0852-1

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  • DOI: https://doi.org/10.1007/s11663-016-0852-1

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