Mechanical component
AssigneeNtn Corporation
InventorsKohei MIZUTA, Naoki FUJIMURA, Chikara OHKI
Life of this patent
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Abstract
A mechanical component has a surface and is made of steel subjected to quenching and tempering. The mechanical component includes a nitrided layer formed at the surface. Steel contains at least 0.95 mass % and at most 1.10 mass % of carbon, less than 0.30 mass % of silicon, less than 0.50 mass % of manganese, less than 0.0080 mass % of sulfur, at least 1.3 mass % and at most 1.6 mass % of chromium, and a remainder composed of iron and an inevitable impurity. An average nitrogen concentration at the surface is equal to or more than 0.10 mass %. A hardness at the surface is equal to or more than 850 Hv. An amount of retained austenite at the surface is equal to or less than 20 volume %.
Claims7
A mechanical component having a surface, the mechanical component being made of steel subjected to quenching and tempering, the mechanical component comprising:
- a nitrided layer formed at the surface, wherein
- the steel contains at least 0.95 mass % and at most 1.10 mass % of carbon, less than 0.30 mass % of silicon, less than 0.50 mass % of manganese, less than 0.0080 mass % of sulfur, at least 1.3 mass % and at most 1.6 mass % of chromium, and a remainder composed of iron and an inevitable impurity,
- an average nitrogen concentration at the surface is equal to or more than 0.10 mass %,
- a hardness at the surface is equal to or more than 850 Hv, and
- an amount of retained austenite at the surface is equal to or less than 20 volume %.
Dependencies are inferred from the claim text.