Metall. Res. Technol.
Volume 117, Number 6, 2020
|Number of page(s)||8|
|Published online||29 October 2020|
Effect of Ce-La on inclusion evolution in Al-killed high strength steel
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing (USTB),
30 Xueyuan Road, Haidian District,
100083, PR China
2 Baotou Iron and Steel Group Corp., Kundulun District, Baotou 014010, Inner Mongol, PR China
* e-mail: email@example.com
Accepted: 5 October 2020
The mechanism of inclusion evolution after rare earth addition based on oxide metallurgy was investigated experimentally and using thermodynamic calculations, where Ce-La was added to Al-killed high strength steel during Ruhrstahl-Heraeus refining to modify the oxide inclusions within the steel. The typical inclusions observed before Ce-La addition were spherical magnesium aluminate spinel inclusions. And fewer individual Al2O3 inclusions and Al2O3–TiOx inclusions were also observed. The addition of Ce-La led to transformation of MgO · Al2O3 spinel inclusions to (Ce,La)2O3, (Ce,La)2O2S and (Ce,La)2O2S + MgO · Al2O3 inclusions. Thermodynamic calculations indicated that Ce-La combined with dissolved oxygen and sulfur in molten steel to form rare earth inclusions, while the remainder of the Ce and La modified MgO · Al2O3 to (Ce,La)2O3 and (Ce,La)2O2S.
Key words: Ce-La treatment / inclusion transformation / oxide metallurgy / thermodynamic calculation / RH refining / Al-killed steel / industrial experiments / MgO · Al2O3 spinel inclusions / rare earth inclusions / FactSage
© EDP Sciences, 2020
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