Examination of desulfurization behaviour of ladle furnace slags of a low-sulfur steel
The aim of this research was mainly to investigate desulfurization behaviour of
ladle furnace slags of a low-sulfur steel. First, the change of the amount of unstable
oxides (FetO and MnO) in slags was studied from the converter till the end of ladle
furnace treatment for different steel quality groups. It was found that the change in
the amount of unstable oxides could be examined best with low-C steel qualities.
Then, the change of activity of iron oxide was investigated for a member of low-C
steel quality group, namely 4937K, a low-S steel. The relation between the degree
of desulfurization at the ladle furnace, % DeS (measured), and the change in
activity of iron oxide, % Decrease in FetO a , was examined first using an empirical
expression obtained from literature. Then, this relationship was studied using steel
oxygen activity measurements conducted at the ladle furnace. With this method, a
regression formula was proposed for 4937K slags relating activity coefficient of
iron oxide, FetO
γ , with the major slag components. The results obtained from steel
oxygen activities were found to be representative for 4937K steel-slag system
showing similar behaviour with the ones from the empirical expression obtained
from literature. Similar results were found using Temkin equation and the
polymeric anion model. In relation to formation of less harmful inclusions to
suppress adverse effects of sulfur, morphological studies of some steels produced
in ERDEMİR plant were performed. D-type globular inclusions with severity
values of 1-2 were observed.
Ender Keskinkılıç
Examination of desulfurization behaviour of ladle furnace slags of a low-sulfur steel · 2007 · 177 sayfa.
Danışman: Prof. Dr. Ahmet Geveci ; Prof. Dr. Yavuz Topkaya
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