Abstract
The removal of alumina inclusions from steel melts is characterized both qualitatively and quantitatively. Two specific types of filters have been used in this investigation: (1) tabular alumina having 0.2 to 0.5 cm particle size, and (2) extruded cellular monolithic alumina having 400 square cells per in2. The starting steel melts contained alumina inclusions of the order of 1 to 5Μm in size. Both chemical analyses and quantitative metallography of samples before and after filtration were carried out; in the latter, volume fraction and the size distribution of the inclusions were evaluated. It was found that alumina inclusions greater than 2.5Μm were completely removed by filtration and those smaller than 2.5Μm were substantially reduced in terms of number of inclusions per mm2. A good correlation has been found between filtration performance data evaluated by quantitative metallographic techniques and those evaluated by chemical analysis.
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