The solubility products of vanadium carbide and nitride in ferritic iron of Fe-V-C and Fe-V-N systems were studied in the temperature range from 700 to 800°C. The specimens, after solution treating and subsequent quenching into ice water, were heat-treated in the ferrite range to precipitate the vanadium carbide or nitride sufficiently. The contents of dissolved carbon, nitrogen and vanadium in these specimens were determined by the internal friction measurement and chemical analysis respectively. As the results, the solubility products are represented by the following equations;
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\ oindentThese results show that solubility preducts of vanadium carbide and vanadium nitride in ferritic iron come to the lower value of about one-tenth than those in austenitic iron, and that the solubility product of vanadium carbide in ferritic iron is about one hundred times greater than that of vanadium nitride.