BEARING PART AND ROLLING BEARING
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United States of America Patent
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Issued Date -
Dec 3, 2020
app pub date -
Dec 5, 2018
filing date -
Dec 18, 2017
priority date (Note) -
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Abstract
A bearing part according to one embodiment of the present invention is a bearing part composed of a chromium molybdenum steel, the bearing part including a diffusion layer in a surface of the bearing part. The diffusion layer includes a plurality of compound grains and a plurality of martensite blocks. An average grain size of the compound grains is less than or equal to 0.3 μm. An area ratio of the compound grains in the diffusion layer is more than or equal to 3%. A maximum grain size of the plurality of martensite blocks is less than or equal to 3.8 μm.
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