Abstract: A method for producing hardened parts of steel from an air-hardening steel comprising the steps of heating the steel is heated to a temperature above 1,100° C., hot-working the steel parts until they reach the A1 emperature, cooling the steel parts in air to about 280° C. under simultaneous thermo-mechanical sizing treatment, then cooling the steel parts in air to room temperature, stress relief treating the steel parts at 150-250° C., and hard-machining the steel parts.

Abstract: In a method for producing machine elements of steel having a carbon content of 0.3 to 1.1%, blanks are heated to austenitizing temperature and austenitized, quenched for the formation of martensite, heated from room temperature to a maximum tempering temperature, and immediately after reaching said maximum temperature cooled to room temperature to attain a hardness of 45 to 65 RHC and finish-machined to machine elements.

Abstract: Steel for ball and roller bearings and similar applications, containing, in % by weight:______________________________________ 0.70-0.95% Carbon 0.01-0.30% Silicon 0.15-0.50% Manganese 0.5-2.5% Chromium 0.10-1.5% Molybdenum max. 0.25% Vanadium ______________________________________the rest up to 100% being iron and other residual elements normally present in steel, andwith the further proviso that the total area percentage of oxide inclusions must not exceed 0.0012%, that the area percentage of titanium-carbonitrides must not exceed 0.0015%, and that the area percentage of sulphide inclusions must not exceed 0.030%, the respective area percentages being measured according to the inclusion rating method defined in the Swedish Standard SS111116, wherein the field of vision shall be 0.8 mm and the number of fields of vision to be surveyed shall be at least 1000.

Abstract: In a process for case-hardening rolling bearing elements of low-alloy nickeliferous steel, the rolling bearing elements are carburized in a dissociating carburizing gas, cooled down, heated to hardening temperature, austenitized in the carburized layer and, lastly, quenched.So that no brittleness of the rolling bearing elements takes place upon carburization due to dissociated hydrogen, the bearing elements are cooled from carburizing heat down to about 300.degree. C. in agitated inert gas and then held at this temperature, so that sufficient dissociated hydrogen escapes from the carburized layer of the rolling bearing elements. Subsequent heating of the said elements to hardening temperature or to intermediate annealing temperature is advantageously effected after holding at 300.degree. C.