초록 ▼

An outer ring, an inner ring and a ball serving as mechanical components configuring a deep groove ball bearing are formed of steel containing at least 0.77 mass % and not more than 0.85 mass % of carbon, at least 0.01 mass % and not more than 0.25 mass % of silicon, at least 0.01 mass % and not mor

An outer ring, an inner ring and a ball serving as mechanical components configuring a deep groove ball bearing are formed of steel containing at least 0.77 mass % and not more than 0.85 mass % of carbon, at least 0.01 mass % and not more than 0.25 mass % of silicon, at least 0.01 mass % and not more than 0.35 mass % of manganese, at least 0.01 mass % and not more than 0.15 mass % of nickel, at least 3.75 mass % and not more than 4.25 mass % of chromium, at least 4 mass % and not more than 4.5 mass % of molybdenum and at least 0.9 mass % and not more than 1.1 mass % of vanadium with a remainder consisting of iron and impurity, and have raceway/rolling contact surfaces, the surface being included in a region having a nitrogen enriched layer having a nitrogen concentration of at least 0.05 mass %, the nitrogen enriched layer having a carbon concentration and the nitrogen concentration, in total, of at least 0.82 mass % and not more than 1.9 mass %.

대표청구항 ▼

1. A mechanical component formed of steel containing at least 0.77 mass % and not more than 0.85 mass % of carbon, at least 0.01 mass % and not more than 0.25 mass % of silicon, at least 0.01 mass % and not more than 0.35 mass % of manganese, at least 0.01 mass % and not more than 0.15 mass % of nic

1. A mechanical component formed of steel containing at least 0.77 mass % and not more than 0.85 mass % of carbon, at least 0.01 mass % and not more than 0.25 mass % of silicon, at least 0.01 mass % and not more than 0.35 mass % of manganese, at least 0.01 mass % and not more than 0.15 mass % of nickel, at least 3.75 mass % and not more than 4.25 mass % of chromium, at least 4 mass % and not more than 4.5 mass % of molybdenum and at least 0.9 mass % and not more than 1.1 mass % of vanadium with a remainder consisting of iron and impurity, and having a surface, said surface being included in a region having a nitrogen enriched layer having a nitrogen concentration of at least 0.05 mass %, said nitrogen enriched layer having a carbon concentration and the nitrogen concentration, in total, of at least 0.82 mass % and not more than 1.9 mass % throughout all of the nitrogen enriched layer other than where carbides and nitrides are formed. 2. The mechanical component according to claim 1, wherein said nitrogen enriched layer has a thickness of at least 0.11 mm. 3. The mechanical component according to claim 1, wherein said nitrogen enriched layer has a hardness of at least 830 HV. 4. The mechanical component according to claim 1, wherein said nitrogen enriched layer, as observed with a microscope, has one or less nitride of iron having an aspect ratio of at least 2 and a length of at least 7.5 μm in five fields of view each of a square region having each side of 150 μm. 5. The mechanical component according to claim 1, used as a bearing component. 6. A rolling bearing comprising: a race member; anda plurality of rolling elements disposed in contact with said race member on an annular raceway, said race member being the mechanical component according to claim 1, said rolling elements being formed of ceramic. 7. The rolling bearing according to claim 6, provided in a gas turbine engine and supporting a rotary member that is one of a main shaft and a member rotating as said main shaft rotates, relative to a member adjacent to said rotary member rotatably.