減圧下における溶融高クロム鋼の脱炭反応

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Decarburization of molten Fe-C-Cr steels by oxygen top blowing under reduced pressure has been studied in a 100kg capacity vacuum induction furnace. The results are summarized as follows : (1) Decarburization process could be devided into three stages; the first stage in which decarburization reaction proceeds by the preferential oxidation of carbon, the second stage in which carbon and chromium in the bath are oxidized simultaneously, and the third stage in which the reaction proceeds by the preferential oxidation of chromium. The relationship between carbon and chromium in the last stage was approximated by the following equation. log([%Cr]/[%C])=-12500/T+9.04 (2) The oxygen efficiency for the decarburization reaction in the first stage was found between 74% and 78% for the Fe-C heats and between 37% and 64% for the Fe-C-Cr heats. The efficiency for the Fe-C heats was hardly effected by the bath temperature and blowing condition, but that for the Fe-C-Cr heats increased with increasing in bath temperature and in the size of oxygen lance diameter and with decreasing in oxygen flow rate. (3) Experimental data concerning oxygen balance and activation energy suggested that the decarburization reaction resulted from the reduction of iron and chromium oxides which were formed by oxygen jet at the surface of molten metal cavity. It could be stated that the rate of decarburization was affected not only by the oxygen flow rate but also by physical and chemical properties of oxide and metal splashing behavior resulted from CO boiling.
社団法人日本鉄鋼協会の論文
1973-06-01

減圧下における溶融高クロム鋼の脱炭反応

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