METHOD FOR HEAT TREATMENT OF SURFACE HARDENING OF STEEL, STEEL SUITABLE FOR THIS TREATMENT AND TREATED STEEL OBTAINED

摘要

P WE OBTAIN A STEEL PRODUCT HAVING A SURFACE LAYER OF MARTENSITY AND A LOWER BATH HEART HAVING A VICKERS HARDNESS OF AT LEAST 600HV, SUBMITTING ALLOY STEEL WITH AN AVERAGE CARBON CONTENT, WEIGHT 0.45 TO 0 , 60 DE C, UP TO 0.50 DE SI, 0.40 TO 1.30 DE MN, UP TO 4.00 DE NI, 0.35 TO 0.55 DE CR, UP TO 0.70 DE MO, THE REST BEING IRON AND ACCIDENTAL IMPURITIES, TO A CARBONITRURATION TREATMENT AT A TEMPERATURE OF 800 TO 900C, SUBMITTING THE CARBONITURE STEEL RESULTING FROM AN ISOTHERMAL QUENCH IN A HOT BATH FROM 230 TO 300C DURING A SUITABLE DURATION TO TRANSFORM THE HEART OF STEEL INTO A LOWER AND INSUFFICIENT BATH TO CAUSE SOME CONVERSION OF THE SURFACE LAYER OF THE STEEL, THEN COOLING THIS STEEL THEREFORE. /P