METHOD AND DEVICE FOR HARDENING OF STEEL PARTS AND STEEL PARTS THUS HARDENED Russian patent published in 2015 - IPC C23C8/20 C23C8/24 C23C8/30 F27B5/00 

FIELD: process engineering.

SUBSTANCE: set of invention relates to hardening of steel parts. Steels parts are heated to 950-1200°C, some 30-100% of part surface being heated by direct heat radiation falling at spatial angle of 0.5-2 srad of the heater. Part is subjected to carbon- or nitrogen-bearing gas at 950-1200°C and pressure under 100 mbar. Parts are held in atmosphere of said gas at pressure lower than 100 mbar and 950-1200°C. If necessary, previous steps are reiterated and parts are cooled down. Device for parts hardening comprises two or more carbonisation chambers, at least one cooling chamber and parts racks transfer system. Said cooling chamber can be coupled with every carbonisation chamber via one or several vacuum valves. Every carbonisation chamber has rack intake element and at least two heaters arranged to direct radiation to part surface at medium spatial angle of 0.5-2 srad.

EFFECT: efficient hardening of parts with decreased thermal flexure, decreasing slip or friction losses.

40 cl, 11 dwg, 2 ex