Abstract
The determination of oxygen in steel is highly important for the study of steel making reactions, and the most appropriate, means of determination is the vacuum-fus on method.Among several types of vacuum-fusion furnaces the authors adopted a carbon-spiral-furnace which was not so expensive, and examined the accuracy of our apparatus. The results was satisfactory as follows:The graphite crucible is heated and degassed at 2000-2100°C for 2·5-3 hours till the pressure in the furnace becomes the order of 10-4mm Hg. When the temperature is lowered to the experimental temperature of 1600-1700°C, the pressure in the furnace reaches the order of 10-5mm Hg, and shows the blank value of 0·10-0·05cc CO/15mn at room temperature By the use of the present earbon-spiral furnace, the 98% oxygen inclusion of the pure Fe2O3 powder and the 97% of the pure SiO2 powder may be extracted.
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