Abstract
Laboratory-scale experiments were conducted to investigate the oxygen content of Si-deoxidized H13 die steel by ferrous oxide-containing slags at 1873 K. The calculation of thermodynamics and kinetics was performed to evaluate the oxygen level of molten steel through [Si]–[O] equilibrium and [Fe]–[O] equilibrium. The results show that as the FeO content in slag increases, the oxygen content with [Si]–[O] equilibrium (w([O])Si) has almost no change. When both the oxygen content with [Fe]–[O] equilibrium (w([O])Fe) and w([O])Si are less than the initial oxygen content in steel (w(TO)i), the oxygen content in steel (w([O])) depends on the higher value between w([O])Si and w([O])Fe. In the case of w([O])Fe > w(TO)i, the value of w([O]) is the difference between the sum of w(TO)i and w([O])Si and the value of w([O])Fe. The reaction rates of [Si]–[O] and [Fe]–[O] are equal, which are controlled by the mass transfer of oxygen in molten steel. The evaluation method is suitable to the whole smelting process of Si-deoxidized H13 die steel.
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Acknowledgements
The authors are thankful for the support from the National Natural Science Foundation for Young Scientists of China (51704021), and Fundamental Research Funds for the Central Universities (FRF-TP-20-004A3, FRF-TP-19-030A2, and FRF-TP-16-079A1). The authors wish to thank the timely help given by Li-hui Han in University of Science and Technology Beijing and Dr. Min Liu in Xin Steel in experimental operation.
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Li, Sy., Li, B., Zhao, Xm. et al. Evaluating oxygen level of Si-deoxidized H13 die steel using ferrous oxide-containing slags at 1873 K. J. Iron Steel Res. Int. 28, 978–989 (2021). https://doi.org/10.1007/s42243-020-00532-8
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DOI: https://doi.org/10.1007/s42243-020-00532-8