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| Effect of slag composition on steel cleanliness in interstitial-free steel |
| Rui Wang1,Yan-ping Bao1,*,Yi-hong Li2,Tai-quan Li3,Di Chen3 |
1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
2 School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China
3 Handan Iron & Steel Group Co., Ltd. of HBIS, Handan 056000, Hebei, China |
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Abstract Ladle slag affects steel cleanliness at the end of the Ruhrstahl-Hereaeus (RH) and holding process. The relationship between composition of ladle slag, total oxygen (TO) and inclusions was investigated using X-ray fluorescence (XRF), infrared absorption, and SEM+EDS methods. The results indicate that TO in steel at the end of RH increases linearly with increasing FeO content in slag. TO is lower when wCaO/wAl2O3 (C/A)=1.5-2.0 than that of C/A=1.0-1.4 under an approximate content of FeO. During the holding process, irregular Al2O3 inclusions are newly generated due to slag reoxidation. Additionally, Al2O3-TixO inclusions are newly generated in the steel when the content of FeO is higher. By combining experimental and thermodynamic calculation results, it is determined that the slag has a good melting property within the zone of C/A=1.2-1.8 and adsorption capacity of Al2O3 when the content of SiO2 in slag is controlled at 4%-6%. The increase in the C/A ratio and the decrease of FeO content in slag can slow down the reoxidation rate.
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Received: 22 September 2016
Published: 06 June 2017
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| Fund:National Natural Science Foundation of China;the National Key Technology R&D Program;Doctoral Fund of Ministry of Education of China |
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Corresponding Authors:
Rui Wang
E-mail: Wangrui_1988@hotmail.com
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2017, Vol. 24 
