Metall. Res. Technol.
Volume 113, Number 2, 2016
|Number of page(s)||10|
|Published online||29 February 2016|
Effect of FeO content in Slag on formation of MgOfflAl2O3 inclusion for Al-killed steel
College of Materials Science and Engineering,
Chongqing University, Chiongqing
Accepted: 19 January 2016
In this study, experiments are carried out to investigate the effects of FeO content in slag on formation of MgOfflAl2O3 inclusion for Al-killed steel, and thermodynamic and kinetics analysis are made to explain the experimental phenomena. Result shows that the dissolved [Mg] in steel is supplied from the reduction of MgO in slag by [Al] in steel after deoxidation with Al. However, the specific [Mg] content in steel is affected largely by FeO content rather than MgO content in slag. At low FeO content, the dissolved [Mg] in steel in equilibrium with FeO in slag is enough to transform most of the Al2O3 into MgOfflAl2O3 inclusions; at high FeO content, the dissolved [Mg] in steel can be expended by FeO in slag at the slag/metal interface and the formation of MgOfflAl2O3 can be restrained. In present work, FeO content in slag should be controlled at about 5 wt-% to avoid the formation of MgOfflAl2O3 as well as minimize the reoxidation between steel and slag as much as possible.
Key words: Experiments / thermodynamic / kinetics / FeO content / MgOfflAl2O3inclusion
© EDP Sciences 2016
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