低炭素領域における溶鉄の脱炭反応機構

概要

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The present paper deals with a kinetic study of decarburization of liquid Fe-C alloy in CO-CO_2 atmospheres at 1600℃. The study has been especially directed towards determining the rate-controlling steps at low carbon contents of the melt. In the concentration range above 0.05%C__-, the rate of decarburization is influenced by the gas flow rate. It is shown that at carbon content higher than 0.1∿0.15%, the decarburization is controlled by gaseous diffusion. In the concentration range below 0.05%C__-, the rate of decarburization no longer depends on the gas flow rate, if it is higher than 1300 cc/min. The views on the mechanism of decarburization under this condition are summarized as follows ; (1) The decarburization by blowing gas of the ratio pco_2/pco below 1/4 is controlled by chemical reaction. The reactions conceived here are ; [chemical formula]. The results can be explained reasonably well by postulating appropriate values for k_2, k_3', k_1'/k_3'. (2) At higher gas ratio (pco_2/pco≳1/4), the rate-determining factor changes gradually. It is shown that at pco_2/pco≳7/3, the decarburization is controlled by the mass transfer of carbon in liquid iron, themass transfer coefficient being 0.036 cm/sec.
社団法人日本鉄鋼協会の論文
1972-01-01