CARBONITRIDING OF PARTS FROM DIE STEELS Russian patent published in 2013 - IPC C23C8/76 

FIELD: metallurgy.

SUBSTANCE: proposed method comprises preparation of paste by mixing, application of said paste on parts and heating with curing. In paste mixing, additionally added are paste-forming anger, a NC 222 nitrocellulose lacquer, and charcoal black DG-100 at the following ratio of components, wt %: ferricyanic potassium K₄Fe(CN)₆ - 20-30, NC 222 nitrocellulose lacquer - 15-20, charcoal black DG-100 making the rest. Heating is performed to 680°C with holding at said temperature for 3 hours, then parts are cooled in oil and subjected to low-temperature annealing at 200°C for 2 hours.

EFFECT: higher ductility of carbonitrided diffusion layers and impart strength, die longer life.

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