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| Effect of RH Refining on Evolution and Control of MgO·Al2O3 Inclusion in Non-Oriented Silicon Steel |
| ZENG Ya-nan, SUN Yan-hui, CAI Kai-ke, XU Rui |
| School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing，Beijing 100083， China |
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Abstract Based on the practical production of non-oriented silicon steel, the evolution of inclusion type and the formation of MgO?Al2O3 inclusion were analyzed in the process of BOF→RH→CSP. The thermodynamic conditions for forming MgO?Al2O3 inclusion were discussed and the behavior of slag entrapment of molten steel was also simulated by CFD software during RH refining. The results showed that the value of [w([MgO])/w([Al2O3])] was in the range of 0.005?0.020 and no MgO?Al2O3 inclusion was observed at 20 and 30 min in RH refining; on the contrary, the value of [w([MgO])/w([Al2O3])] was in the range of 0.3?0.5 and the MgO?Al2O3 inclusion accounts for 58.5% of total amount of inclusions after RH refining. The compositions of slag were similar to the composition of inclusions; furthermore, the simulation results of CFD software show that the surface velocity was 0.57 m/s, which was greater than the critical velocity of 0.45 m/s. When the test steel was in equilibrium with slag, the [w([Mg])] was 0.000 24%?0.000 28% and [w([Al])] was 0.31%?0.37%, which was in theoretically calculated MgO?Al2O3 formation zone, thereby leading to formation of MgO?Al2O3 inclusion in steel. Thus, the MgO?Al2O3 inclusion was inhibited by reducing the quantity of slag entrapment and roughing slag in casting and controlling composition of slag and the MgO content in the ladle refractory.
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Received: 21 February 2014
Published: 10 September 2014
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2014, Vol. 49 
