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Investigation on Non-Metallic Inclusions in LCAK Steel Produced by BOF-LF-FTSC Production Route
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Investigation on Non-Metallic Inclusions in LCAK Steel Produced by BOF-LF-FTSC Production Route
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Journal Article
Investigation on Non-Metallic Inclusions in LCAK Steel Produced by BOF-LF-FTSC Production Route
2011
Overview
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 O3-CaO type inclusion with a CaS ring, and the mechanism of the transformation was pro posed and discussed via thermodynamic and kinetic analysis. Besides, to avoid CaS precipitation, the product of W[Al] ×w3[S] in steel should be less than 2.0 × 10 10 at 1873 K, which remands higher desulfurization ratio during LF refining.
