FIELD: metallurgy; thermal and chemical thermal treatment of parts made from magnetically soft high-chromium steel.
SUBSTANCE: proposed method includes machining of parts followed by stabilizing annealing; in the course of annealing, carbo-nitriding is performed in charcoal mixtures with activating nitrogen- and carbon-containing additives at stepped heating first at temperature above Curie point 780-820 C continued for 3-4 h and then at temperature above Curie point 680-700 C continued for 2-3 h followed by cooling in container at rate of 50-80 C/h. Sometimes, abrasive jet treatment may be used instead of machining.
EFFECT: enhanced wear resistance of valve pair parts; increased service life of valves at retained corrosion resistance.
2 cl, 5 dwg, 1 tbl, 3 ex
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