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Effect of low basicity refining slag on evolution and removal of oxide inclusions in 55SiCrA spring steel

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Abstract

The laboratory experiments, thermodynamic analysis, dynamic analysis, and industrial trials were carried out to investigate the influence of refining slag on the evolution and removal of oxide inclusions in 55SiCrA spring steel. The reduction in basicity and Al2O3 content in refining slag can reduce the [Al]s content in the molten steel, which is conducive to the control of the low melting point of inclusions. However, the refining slag with excessively low basicity transfers the oxygen element to molten steel and increases the Al2O3 content in inclusions, which is harmful to the control of inclusions. According to the chemical compositions of inclusions and refining slag in laboratory experiments, their physical parameters were calculated. The maximum separation ratio and the moving time of inclusions to reach the maximum separation ratio (tmax) of inclusions under different laboratory experimental conditions were studied. The maximum separation ratio of inclusions is positively correlated with the overall wettability (cosθIMS) among the slag, steel, and inclusions. The maximum separation ratio of inclusions obtained by laboratory experiments is between 85% and 91%. The tmax decreases with the decline in basicity and Al2O3 content of refining slag, but excessively low basicity will increase the tmax. The basicity of refining slag in the range of 0.88–0.97 and the content of Al2O3 less than 6% is not only conducive to reducing the content of Al2O3 and the melting point of inclusions but also beneficial to removing the inclusions to the slag. The slag system shows good metallurgical results in industrial trials.

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Acknowledgements

This work was financially supported by the State Key Laboratory of Advanced Metallurgy Foundation (No. 41621005), and the Subject of Xiangtan Branch, Hunan Valin Iron & Steel Co., Ltd., China (No. 2018386).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Chen Wang, Jiang-shan Zhang, Jun-xiong Huang, Kun-rui Shen & Qing Liu

  2. Xiangtan Branch, Hunan Valin Iron & Steel Co., Ltd., Xiangtan, 411100, Hunan, China

    Wei Tang & Jun Chen

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  1. Chen Wang
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  2. Wei Tang
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  7. Qing Liu
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Correspondence to Qing Liu.

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The manuscript has not been published before and is not being considered for publication elsewhere. All authors have contributed to this manuscript for important intellectual content and review and approved the final manuscript. The authors declare no conflict of interest.

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Wang, C., Tang, W., Zhang, Js. et al. Effect of low basicity refining slag on evolution and removal of oxide inclusions in 55SiCrA spring steel. J. Iron Steel Res. Int. 30, 1755–1768 (2023). https://doi.org/10.1007/s42243-023-00941-5

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