低酸素分圧の Ar-O_2 混合ガス吹付けによる低炭素濃度溶鉄の脱炭および酸素吸収

概要

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Kinetics of decarburization and oxygen absorption of molten iron of low carbon and oxygen concentrations has been studied. The decarburization and oxygen absorption experiments were performed by blowing Ar-O_2 mixture (oxygen partial pressure 1.0×10^<-5><P_<O_2>(atm)<5.5×10^<-2> and gas-flow rate 1000 (and 1900) Ncm^3/min) onto the melt surface. The rates of decarburization and oxygen absorption increase with increasing oxygen partial pressure (P_<O_2>>1.0×10^<-2>atm). At oxygen partial pressures of P_<O_2><1.0×10^<-4>atm, the oxygen concentration is kept almost constant. The total reaction rate of oxygen with the melt (=decarburization rate+oxygen absorption rate) is larger than the rate of oxygen absorption without decarburization and smaller than the rate calculated from a reaction model of oxygen diffusion in the gas phase. It is presumed that formation of oxide film on the melt surface has influence on the decarburization and oxygen absorption rates. A mathematical model is proposed to explain the rates of decarburization and oxygen absorption.
社団法人日本鉄鋼協会の論文
1991-03-01