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
Effect of slag composition on steel cleanliness in interstitial-free steel
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
ժҪ 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.
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.
��������: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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E-mail: Wangrui_1988@hotmail.com
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Rui Wang,Yan-ping Bao,*,Yi-hong Li,Tai-quan Li,Di Chen. Effect of slag composition on steel cleanliness in interstitial-free steel[J]. �й������ڿ���, 2017, 24(6): 579-585.
Rui Wang,Yan-ping Bao,*,Yi-hong Li,Tai-quan Li,Di Chen. Effect of slag composition on steel cleanliness in interstitial-free steel. Chinese Journal of Iron and Steel, 2017, 24(6): 579-585.
2017, Vol. 24 
