Inclusions in 430 Stainless Steelmaking During AOD-LF-CC Process
FU Bang-hao1,CHEN Chao1,CHENG Guo-guang1,PAN Ji-xiang2,LI Yan2,PAN Wei2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. Jiuquan Iron and Steel Co., Jiayuguan 735100, Gansu, China
Abstract：Samples taken from the end of AOD, LF and tundish casting operations of the AOD-LF-TD process during 430 stainless smelting process were investigated and identified through the scanning electron microscope with an EDS X-ray analyzer to characterize the inclusions in terms of the chemical composition, size and morphology. The results show that the total oxygen content, the inclusion content and size decrease throughout the AOD-LF-TD process. Additionally, the types of inclusions change at different stages of the process; the inclusions in AOD are mainly CaO-SiO2-MgO compounds, while in LF and tundish, it is detected mostly CaO-SiO2-MgO-Al2O3 inclusions, besides, inclusions with MnO compound are also found in tundish. Meanwhile, the inclusions in AOD with the compounds of CaO-SiO2-MgO are found to be close to the slag composition. The variation of the composition of the inclusions in LF and tundish are related to the refining process, continuous casting protection as well as temperature drop.
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2012, Vol. 47 
