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Conclusions

Based on the comparison between the selected traditional basicity mold flux (TB slag) and ultrahigh-basicity mold flux (HB slag), and the large-scale application in industrial processes, some conclusion can be drawn:

  • (1) Compared with TB slag films, the thickness and growth speed of HB slag film are smaller, which is expected to improve the lubrication capacity of mold fluxes.
  • (2) Pores contribute to the surface roughness of slag films. HB films have higher roughness at the earlier stage of solidification, which decreases when the probe immersion time exceeds 15 s. For TB films, the effect of probe immersion time on roughness is not obvious.
  • (3) The overall porosity of HB films is higher than TB films have.
  • (4) Based on two years of industrial use, the HB slag improved the surface quality of slabs. No exceptional conditions like sticking breakout occurred.

References

  • 1. K. C. Mills, A. B. Fox, “The Role of Mould fluxes in continuous casting-so simple yet so complex.” ISIJ International, 43(10) (2003), 1479.
  • 2. H. Nakada et al., “Mechanism of heat transfer reduction by crystallization of mold flux for continuous casting.” ISIJ International. 48 (4) (2008), 446.
  • 3. J. Chi and Y. Gan, Mold fluxes. (Shen yang, China: Northeast University Press, 1992), 5-25.
  • 4. S. Seetharaman, ed., Treatise on process metallurgy (Oxford: Elsevier, 2013), 435-475.
  • 5. K. Tsutsumi, T. Nagasaka and M. Hino. “Surface roughness of solidified mold flux in continuous casting process.” ISIJ International, 39(11) (1999), 1150.
  • 6. M. Susa et al., “Effects of both crystallisation and iron oxides on the radiative heat transfer in mould fluxes.” ISIJ International, 49 (11) (2009), 1722.
  • 7. X. Long et al., “Properties of High Basicity Mold Fluxes for Peritectic Steel Slab Casting.” Journal of Iron and Steel Research International, 19(7) (2012), 39-45.
  • 8. X. Long et al., “Effects of Crystallization of Mould Fluxes on Property of Liquid Slag Film and Its Impact on Peritectic Steel Slab Continuous Casting” in 4th International Symposium on High-Temperature Metallurgical Processing, (Warrendale, PA: TMS, 2013), 155-162.
  • 9. S. He et al., “Effects of crystallisation behaviour of mould fluxes on properties of liquid slag film” Ironmaking & Steelmaking, 39(2012), 593-598.
  • 10. K. Lara Santos Assis, “Heat transfer through mold fluxes: a new approach to measure thermal properties of slags” (Ph. D. Thesis, Carnegie Mellon University, Pittsburgh, 2016).
  • 11. H. Ryu et al., “Crystallization behaviors of slags through a heat flux simulator.” ISIJ International. 50(8) (2010), 1142.
  • 12. Y. M. He et al., “Application of high-basicity mould fluxes for continuous casting of large steel slabs” Ironmaking & Steelmaking, 43(8) (2016), 588-593.
 
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