FIELD: ferrous metallurgy, namely heat strengthening of reinforcement of carbon and low-alloy steel, mainly of reinforced-concrete sleepers.
SUBSTANCE: method comprises steps of heating moving reinforcement at least in one inductor until temperature exceeding austenization temperature by value up to 300 C; heating reinforcement until termination of austenite conversion before introducing it in flow of cooling fluid; intensified cooling successively in air flow, water flow, water-steam mixture flow for super-cooling reinforcement until temperature of beginning martensite conversion and preferably lower than 100 C. Plant for performing the method includes two inductors for heating before quenching; pairs of drive rollers arranged in front of first inductor, between inductors and after last inductor; apparatus for intensified successive cooling of reinforcement by means of air, water and water-steam mixture in nozzle unit placed inside quenching reservoir; inductor for tempering and straightening apparatus.
EFFECT: enhanced efficiency of heat strengthening process, significantly improved mechanical properties of reinforcement.
10 cl, 3 dwg, 3 tbl
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