Effect of slag composition on steel cleanliness in interstitial-free steel  

作　　者：Rui Wang Yan-ping Bao Yi-hong Li Tai-quan Li Di Chen 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing [2]School of Materials Science and Engineering,Taiyuan University of Science and Technology [3]Handan Iron & Steel Group Co.,Ltd.of HBIS

出　　处：《Journal of Iron and Steel Research International》2017年第6期579-585,共7页

基　　金：financially supported by National Natural Science Foundation of China (Nos.51574019 and 51404018);the National Key Technology R&D Program (2015BAF30B1);Ph.D. Early Development Program of Taiyuan University of Science and Technology(No.20152008)

摘　　要：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）=I. 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 Ti, O 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：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）=I. 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 Ti, O 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：

关 键 词：IF steelLadle slagReoxidationInclusionHolding process 

分 类 号：TF769.4[冶金工程—钢铁冶金]