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| Effects of Collision Behavior on Al2O3 Based Inclusion Modification After Calcium Treatment for Aluminium-Killed Steel |
| GUO Jing1, CHENG Shu-sen1,CHENG Zi-jian1,2, ZHANG Ying-wei1 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing,Beijing 100083, China
2. Jiuquan Iron and Steel Group Co., Ltd., Jiayuguan 735100, Gansu, China |
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Abstract The steel samples were taken out at different time after calcium-treatment, and the inclusion information in them was monitored by SEM combined with EDS to understand how Al2O3 inclusions were modified during LF refining especially after calcium-treatment for aluminium-killed steel. Another collision mechanism for Al2O3 inclusion modification was proposed: CaO based inclusions precipitate after calcium treatment due to higher calcium concentration around calcium bubble, and then CaO based inclusions and Al 2O3 based inclusion collide together and further react with each other and finally form liquid calcium aluminates. In addition, it points out theoretically that Al2O3 based inclusion could be modified by colliding with CaO based on phase diagram analysis and the mechanism. And the mechanism and rate-controlling step differ from that of Al2O3 based inclusion modification by reduced reaction with calcium. The modification rate of this manner is much fast that Al2O3 based inclusion could be modified well in several minutes. Approximating 21% of Al2O3 based inclusion is modified in this manner in present trials. Finally, it is verified by laboratorial experiment and other researchers′ industrial trials that blowing CaO based powder can also modify Al2O3 based inclusion during secondary refining.
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Received: 05 November 2012
Published: 16 September 2013
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2013, Vol. 48 
