In this study it was aimed to analyse refining processes such as decreasing
reducible oxide content of ladle slag with affecting parameters in low carbon
aluminum killed grades and for the research Erdemir low carbon steel grades 7112K
and 7110K are selected. There was a negative correlation between reducible oxide
amount in ladle slag and desulphurization capacity of ladle slag with metal-slag
reaction and steel internal cleanliness. To refine these properties of slag, aluminium
dross, which was aluminium production discard and has a metallic content around
%30-35 was used and after ladle treatment operation, decrease in reducible oxides
such as FetO, MnO, SiO2, P2O5 was analysed. After the study it was observed that
653 kg. of converter slag leaked during tapping of steel and SiO2 ve P2O5 content of
ladle slag had negligible change after ladle treatment. According to the results, it is
observed that initial %10-12 (FetO + MnO) content was reduced to % 4.5-5.0 (FetO
+ MnO) after ladle treatment with use of aluminium dross. Beside of this, in order to
see the effect of this slag reduction on steel cleanliness, low carbon aluminium killed
grades were compared with ultra-low carbon aluminium killed grades having (FetO +
MnO) content of %16-17 in slag. It was seen that reoxidation of aluminium (loss of
dissolved aluminium) during continuous casting for ULC (ultra-low carbon) gradesis 144 ppm but for LC grades it was 94 ppm and it was being expected that ULC
steel group would have higher inclusion content after casting.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12608132/index.pdf |
| Date | 01 January 2007 |
| Creators | Aydemir, Onur |
| Contributors | Geveci, Ahmet |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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