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| Analysis of aluminum consumption from deoxidation of ladle argon stirring steels and effect of deoxidization technology on inclusions |
| WANG Duo-gang1,2，YU Da-jun3，ZUO Kang-lin1 |
（1. Technology Center， Shanghai Meishan Iron and Steel Co.， Ltd.， Nanjing 210039， Jiangsu， China
2. Center of Efficient Utilization of Resources by Low-Temperature Metallurgy， China Iron and Steel Research Institute Group，Beijing 100081， China
3. Steelmaking Plant， Shanghai Meishan Iron and Steel Co.， Ltd.， Nanjing 210039， Jiangsu，China） |
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Abstract Through the production data of ladle argon stirring steel smelting in 250 t converter，it was found that deoxidization technology during the tapping process had significantly affected the deoxidization consumption. Compared with the incomplete-deoxidization technology during the tapping process，the unit aluminum consumption of the complete-deoxidization technology was about 0.28 kg/t higher，but the utilization of aluminum deoxidization was about 8.3% lower. The unit aluminum consumption of deoxidization increased gradually with the increase of converter end-point temperature and dissolved oxygen content. Meanwhile the increase of converter end-point temperature would promote the increase of dissolved oxygen content. Through the inclusion analysis of SPHC slabs in the two deoxidization technologies，it was found that the total oxygen contents in slabs were equivalent about 0.002 0% in both deoxidization technologies at the macro aspect，the nitrogen content was about 0.002 0% in incomplete-deoxidization technology，whereas the nitrogen content was about 0.002 5% in complete-deoxidization technology. The main inclusions in slabs included Al2O3，Al2O3-MnS，Oxide and[MnS/MnS-CuxS]at micro aspect. Compared with incomplete-deoxidization technology， the average size of Al2O3 inclusion of complete-deoxidization technology decreased about 0.6 μm，the proportion of Al2O3 inclusion and sulfide inclusion decreased about 25% and 5% respectively，and the proportion of Al2O3-MnS inclusions increased about 20%. The decrease of Al2O3 inclusion size was available to formation of Al2O3-MnS inclusion.
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Received: 30 September 2016
Published: 09 June 2017
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2017, Vol. 52 
