FIELD: metallurgy.
SUBSTANCE: item is heated and tempered at low temperature. Also, the long-length item is continuously transferred on a transporter at rate 3-10 mm/sec. The item passes through a local zone of heating with alternative electro-magnetic field of 8-20 kHz frequency. In the local zone the item is heated to temperature 800-1000°C. Further tempering is performed to temperature 300-200°C. Local intensive cooling with a jet of compressed air facilitates formation of martensite structure of metal, where upon temperature of the item is brought to temperature of environment.
EFFECT: high efficiency and manufacture of items with different strength characteristics along section.
2 cl, 1 dwg
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