FIELD: thermochemical treatment of steel; applicable in cyaniding the surfaces of metal articles, particular, steel pipes. SUBSTANCE: the offered method includes heating of articles to austenitic state in mixture of carburizing and nitriding gases with holding at this temperature, cooling down to 500-600 C at the rate preventing decomposition of austenite and further cyaniding at this temperature and isothermal phase conversion of austenite and subsequent cooling. EFFECT: higher efficiency.
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