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：
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)
