Abstract
The oxygen content in liquid iron with 1∼3%C in equilibrium with carbon monoxide of 16, 8, 4 and 1 atm was studied at 1500°C.The results obtained are as follows:(1) The feature of dependence of K1′(=Pco⁄%C×%C) on %C varies with Pco when K1′ is calculated using the analytical value of oxygen which is determined by the vacuum fusion method. That is, when Pco=1 atm, K1′=constant in the range of carbon concentration studied. On the other hand, in the case of Pco=16 atm, K1′ increases with increasing %C.(2) It is considered that the above-mentioned feature is based on the existence of systematic errors included in the analytical values of oxygen. The error amounts to 5∼10 ppm and is considered to originate from the oxide film on the surface of the specimens.(3) After the correction for the systematic error, the value of K1′ is 1700 and 3000 at 2 and 3%C respectively, which is larger than the value of about 500 at %C→0 reported in literatures.(4) The activity coefficient of oxygen in the liquid iron f0 increases with increasing %C, corresponding to e0(C)=0.1.
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