真空吸引脱ガス法による溶鉄の低炭素濃度域における脱炭反応

概要

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A kinetic study has been made on decarburization reaction of molten iron of low carbon and oxygen concentrations with solid oxides. A new degassing method, namely Vacuum Suction Degassing (VSD) method, was applied to decarburize molten iron to an ultra-low carbon concentration. A porous oxide tube, the inside of which was evacuated, was immersed into molten iron. The initial carbon concentration was varied between 110 and 30ppm. The initial oxygen concentration was below 50 ppm. The experiments were performed under Ar atmosphere (1.01×10^5Pa). The experimental temperature was 1853 K. The VSD method can greatly increase the rate of decarburization of molten iron and the carbon concentration decreases to a very low value of a few ppm. The rate of decarburization with an Al_2O_3-SiO_2 tube is higher than that with an Al_2O_3 tube. Increase in gas permeability of a porous tube enhances the decarburization reaction. The apparent rate constant of decarburization with evacuation in the porous tube is about 10 times larger than that without evacuation.
社団法人日本鉄鋼協会の論文
1992-01-01