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Effect of K2O and Na2O in Refining Slag on Non-metallic Inclusions in Tire Cord Steel

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Abstract

In order to understand the effect of K2O and Na2O in refining slag on the non-metallic inclusions in LX72A tire cord steel, steel–slag interaction experiments were conducted at 1873 K (1600 °C), and the properties of the low-basicity (w(CaO)/w(SiO2) ≈ 1) K2O\Na2O-containing (0 to 10 pct) slags were measured at 1773 K (1500 °C) in laboratory. The results show that the addition of K2O and Na2O in refining slag does not result in significant changes in the composition of inclusions in steel, and K and Na elements are not found in the inclusions. Since K2O and Na2O are basic oxides, their addition increases the risk of non-deformable inclusions in steel. According to the measurement of surface tension of the slags, it is estimated that K2O and Na2O are theoretically beneficial in the removal of liquid inclusions in tire cord steel, but the effect is still not remarkable in the experiments. The K2O and Na2O in refining slags cause serious corrosion of refractory, and their volatilization is also evident. Considering these disadvantages, it is not recommended to add K2O and Na2O in refining slag to control the inclusions in tire cord steels.

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Acknowledgments

The present study was financially supported by the Natural Science Foundation of China (52074073, U20A20272).

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, P.R. China

    Guodong Song, Zhiyin Deng & Miaoyong Zhu

  2. School of Metallurgy, Northeastern University, Shenyang, P.R. China

    Guodong Song

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  1. Guodong Song
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  2. Zhiyin Deng
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Correspondence to Zhiyin Deng or Miaoyong Zhu.

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Song, G., Deng, Z. & Zhu, M. Effect of K2O and Na2O in Refining Slag on Non-metallic Inclusions in Tire Cord Steel. Metall Mater Trans B 54, 2383–2394 (2023). https://doi.org/10.1007/s11663-023-02840-2

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  • DOI: https://doi.org/10.1007/s11663-023-02840-2

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