RATES OF NITROGEN ABSORPTION BY LIQUID Fe-Cr AND Fe-Cr-Ni ALLOYS.

Nitrogen absorption rates were measured at 1600 C by the Sieverts method. The apparent mass transfer coefficient of nitrogen absorption decreased with increasing oxygen concentration. The surface tension of liquid Fe-Cr and Fe-Cr-Ni alloy was estimated from the experimental results of nitrogen absorption to ascertain the behavior of adsorbed oxygen at the gas-metal interface. Comparisons are made with the corresponding behavior of liquid iron. The differences of the apparent mass transfer coefficient of nitrogen absorption among Fe-18Cr, Fe-18Cr-8Ni, and Fe-25Cr-20Ni alloys were negligibly small. Silicon, vanadium, and manganese had little effect on the behavior of Fe-18Cr-8Ni.