CONSTITUENT MEMBER OF BEARING, PROCESS FOR PRODUCTION OF SAME, AND BALL-AND-ROLLER BEARING PROVIDED WITH THE CONSTITUENT MEMBER

• Main Authors: KIZAWA, Katsuhiko, ONO, Kentarou, MIKAMI, Tsuyoshi, NAKAJIMA, Chikara
• Format: Patent
• Language: English; French; German
• Published: 27.03.2019
• Subjects: ALLOYS; BEARINGS; BLASTING; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FERROUS OR NON-FERROUS ALLOYS; FLEXIBLE SHAFTS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; THERMAL INSULATION IN GENERAL; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WEAPONS

There is provided a bearing constituent member obtained by subjecting a workpiece, obtained from a steel containing 0.7 to 0.9% by mass of carbon, 0.05 to 0.70% by mass of silicon, 0.05 to 0.7% by mass of manganese, 3.2 to 5.0% by mass of chromium, 0.1 to 1.0% by mass of molybdenum, and 0.05% by mass or more to less than 0.5% by mass of vanadium and the remainder is iron and unavoidable impurities and having a polish-finished surface, wherein the content of carbon in the surface layer ranging from the polish-finished surface to 10 µm is 1.1 to 1.6% by mass, Vickers hardness at the position of a depth of 50 µm from the surface being 800 to 940, the amount of residual austenite at the position of a depth of 10 µm from the surface is 5 to 30% by volume, the content of nitrogen in the surface layer ranging from the surface to 10 µm is 0.1 to 1.0% by mass, particles composed of vanadium nitride having a particle diameter of 0.2 to 2 µm and/or particles composed of vanadium carbonitride having a particle diameter of 0.2 to 2 µm are present in the surface layer ranging from the surface to 10 µm, and the area ratio of the particles composed of vanadium nitride having a particle diameter of 0.2 to 2 µm and/or the particles composed of vanadium carbonitride having a particle diameter of 0.2 to 2 µm in the surface layer ranging from the surface to 10 µm is 1 to 10%.