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| Investigation on Non-Metallic Inclusions in LCAK Steel Produced by BOF-LF-FTSC Production Route |
| YANG Wen1,CAO Jing1,WANG Xin-hua1,XU Zhi-rong2,YANG Jie2 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083,China
2. No.1 Steelmaking Plant, Tangshan Iron and Steel Co Ltd, Tangshan 063000, Hebei, China |
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Abstract The behavior of non-metallic inclusions in LCAK (low carbon aluminum killed) steel produced by BOF (basic oxygen furnace)-LF (ladle furnace) refining-FTSC (flexible thin slab continuous caster) production route was investigated. The results showed that, LF refining for LCAK steel could decrease the wT[O] significantly, and the inclusions were modified by Ca treatment, which prevented nozzle clogging efficiently. However, owing to the unstable casting condition in the earlier stage of casting, a severe reoxidation occurred, accompanied with mold slag entrapment. The transformation of non-metallic inclusions during the steelmaking process was Al2O3��MgO-Al2O3 type inclusion��MgO-Al2O3-CaO type inclusion with a CaS ring, and the mechanism of the transformation was proposed and discussed via thermodynamic and kinetic analysis. Besides, to avoid CaS precipitation, the product of w2[Al]��w3[S] in steel should be less than 2.0��10-10 at 1873 K, which remands higher desulfurization ratio during LF refining.
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Received: 01 June 2010
Published: 26 September 2011
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2011, Vol. 18 
