FIELD: metallurgy.
SUBSTANCE: disclosed here invention refers to thermal treatment and can be implemented at tempering thin section casts of complex shape for successive fabrication of high precision parts out of them. The procedure consists in heating to 535°C and holding during 4 hours, in cooling with a furnace at rate 90-110°C per hour to 420°C, in conditioning for 1 minute, in cooling in water at temperature 90-100°C, in holding for 3 minutes and in cooling in water at temperature 20-30°C.
EFFECT: reduced deformation of casts at tempering and ageing and increased reliability and service life of casts.
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