The method of ladle treatment of of the melts of chromium iron (containing 2–4 % Cr and 3.5 % C) has been developed on the base of conducted investigations; it allows to vary primary structure of iron without variation of chromium and carbon content. Using the developed method, special carbides M₇C₃ have been obtained in iron with low chromium content (less than 4 %), what was practically impossible with conventional technology. Additionally, such low chromium iron can acquire properties typical for high chromium iron: e. g. containing 15–18 % Cr, what allows to rise substantially economical parameters.