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...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：展开更多
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)
文摘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：
