| Title |
Decarburization of Molten Stainless Steel by Slag Containing Cr2O3 |
| Authors |
장용익(Yong Ik Jang); 손호상(Ho Sang Sohn); 김용환(Yong Hwan Kim); 강영조(Young Jo Kang) |
| DOI |
https://doi.org/10.3365/KJMM.2014.52.7.519 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
stainless steel; decarburization; slag; Cr2O3; calcium chromite |
| Abstract |
During refining of stainless-steel melt using the AOD (Argon Oxygen Decarburization) process, slag composition and melt stirring can significantly affect the decarburization behavior and reduction of Cr2O3 in slag. An 18 wt%Cr-8 wt%Ni stainless-steel melt containing 0.2 wt%C was decarburized at 1650 ℃ by different types of slag containing Cr2O3. Melt stirring by Ar or Ar+O2 gas bubbling through a submerged nozzle enhanced the decarburization rate significantly. Pure solid Cr2O3 and liquid slag containing Cr2O3 were far more effective than a solid CaO-Cr2O3 mixture for decarburization. The formation of a stable CaO? Cr2O3 phase in the slag was confirmed by XRD analysis after the decarburization experiment with CaOCr2O3 slag. Therefore, in order to improve the decarburization of stainless-steel melt in low-carbon-content regions, it is essential to increase the liquid fraction of slag. †(Received September 24, 2013) |