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Formation Mechanism of Large CaO-SiO2-Al2O3 Inclusions in Si-Deoxidized Spring Steel Refined by Low Basicity Slag

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Abstract

During the refining of Si deoxidized spring steel by low-basicity slag, with the addition of BaCO3 to refining slag, many BaO-containing CaO-SiO2-Al2O3 inclusions existed in steel, which were with approximate chemical compositions to other CaO-SiO2-Al2O3 inclusions. Thermodynamic calculation revealed that (BaO) in slag can be hardly reduced by [Si] in steel, which meant that CaO-SiO2-Al2O3-BaO inclusions in Si-deoxidized spring steel cannot be produced by chemical reactions among slag-steel-inclusion, viz., they were originated from entrapped slag.

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The authors are grateful to support of Fundamental Research Funds for Central Universities (No. FRF-DF-20-08). And on behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Min Jiang, Ji-Chen Liu, Kai-Lun Li, Rui-Gang Wang & Xin-Hua Wang

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  1. Min Jiang
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  2. Ji-Chen Liu
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  3. Kai-Lun Li
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  4. Rui-Gang Wang
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  5. Xin-Hua Wang
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Correspondence to Min Jiang.

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Manuscript submitted February 15, 2020; accepted May 18, 2021.

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Jiang, M., Liu, JC., Li, KL. et al. Formation Mechanism of Large CaO-SiO2-Al2O3 Inclusions in Si-Deoxidized Spring Steel Refined by Low Basicity Slag. Metall Mater Trans B 52, 1950–1954 (2021). https://doi.org/10.1007/s11663-021-02230-6

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