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Characterics of Deoxidation and Desulfurization during LF Refining Al-killed Steel by Highly Basic and Low Oxidzing Slag

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Abstract

Steel and slag samples were taken at the start and the end of LF refining for steel plate cold common (SPCC), in the compact strip production (CSP) process, and at the same time, the temperature and oxygen activity aioi were measured by using an oxygen sensor. Furthermore, inclusions in steel samples were monitored by scanning lectron microscopy (SEM) combined with energy dispersive spectroscopy (EDS). It was confirmed that a[o] in liquid steel was in equilibrium with inclusion rather than with top slag during LF refining. Desulfurization was rlated to deoxidation since a[o] at slag-steel interface was clarified to be very close to that in liquid steel under the specfic condition in LF with intense stirring by argon blowing and refined by highly basic low oxidizing lag for Al-killed steel. Sulfur partition ratio (Ls) was very sensitive to a[o]. Since a[o] increased rapidly with temperature rise, it not only offset promotion to desulfurization reaction with temperature rise but decreased Ls. For Al-killed steel, the modification of Al2O3 for lowering the activity of Al2O3 in inclusion was bieved to be favorable for both deoxidation and desulfurization during LF refining.

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Authors and Affiliations

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

    Jing Guo (Doctor Candidate), Shu-sen Cheng & Zi-jian Cheng

  2. Jiuquan Iron and Steel (Group) Co., Ltd., 735100, Jiayuguan, Gansu, China

    Zi-jian Cheng

Authors
  1. Jing Guo
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  2. Shu-sen Cheng
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  3. Zi-jian Cheng
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Correspondence to Jing Guo.

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Foundation Item: Item Sponsored by National Natural Sience Foundation of China (61271303)

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Guo, J., Cheng, Ss. & Cheng, Zj. Characterics of Deoxidation and Desulfurization during LF Refining Al-killed Steel by Highly Basic and Low Oxidzing Slag. J. Iron Steel Res. Int. 21, 166–173 (2014). https://doi.org/10.1016/S1006-706X(14)60026-1

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60026-1

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