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| Effect of deoxidation technology on cleanliness of low carbon aluminum killed steel |
| MA Huan-xun1，WANG Xin-hua1，HUANG Fu-xiang1，JI Chen-xi2，PAN Hong-wei2 |
1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083， China
2. Strip Technology Department， Shougang Research Institute of Technology， Beijing 100043， China |
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Abstract Two different deoxidation methods for low carbon aluminum killed (LCAK) steel produced by KR-BOF-RH-CC process were compared： a part of aluminum were added when tapping， followed by deoxidation with carbon in RH process， and then fully deoxidated by aluminum (methodⅠ)； full deoxidation by aluminum when tapping， followed by pure cycling and alloying in RH degasser (method Ⅱ). Apart from total oxygen content measurement and analysis of top slag modification， the morphology， composition， and size of non-metallic inclusions during RH refining process and surface layer of continuously-cast slabs and hot rolled coils were analyzed with Automatic Feature Analysis (AFA) equipped on ASPEX PSEM Explorer. The results show that method Ⅱ is superior to method Ⅰin refining slag modification. Furthermore， the inclusions larger than 20 μm are well removed during RH process and method Ⅱ is also more advantageous than method Ⅰin controlling the size of inclusions in the slab and on hot rolled plate surface， as well as number density and total oxygen content.
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Received: 13 February 2015
Published: 06 January 2016
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2016, Vol. 51 
