Carbonitrided bearing component

A carbonitrided bearing component comprising:

• a carbonitrided layer formed in an outer layer of the carbonitrided bearing component;
• and
• a core portion inner than the carbonitrided layer, wherein
• the core portion has a chemical composition consisting of, in mass %:
• C:
• 0.15 to 0.45%,
• Si:
• 0.50% or less,
• Mn:
• 0.20 to 0.60%,
• P:
• 0.015% or less,
• S:
• 0.005% or less,
• Cr:
• 0.80 to 1.50%,
• Mo:
• 0.17 to 0.30%,
• V:
• 0.24 to 0.40%,
• Al:
• 0.005 to 0.100%,
• N:
• 0.0300% or less,
• O:
• 0.0015% or less,
• Cu:
• 0 to 0.20%,
• Ni:
• 0 to 0.20%,
• B:
• 0 to 0.0050%,
• Nb:
• 0 to 0.100%,
• Ti:
• 0 to 0.100%,
• Ca:
• 0 to 0.0010%, and
• the balance being Fe and impurities, and
• satisfying Formula (1) to Formula (4), wherein
• a concentration of C of a surface of the carbonitrided bearing component is, in mass %, 0.70 to 1.20%,
• a concentration of N of the surface of the carbonitrided bearing component is, in mass %, 0.15 to 0.60%,
• a Rockwell hardness C scale HRC of the surface of the carbonitrided bearing component is 58.0 to 65.0, and
• in the core portion, when a precipitate containing V is defined as a V-based precipitate, and the V-based precipitate having an equivalent circle diameter of more than 150 nm is defined as a coarse V-based precipitate, an area ratio of an area of coarse V-based precipitates to a total area of V-based precipitates is 15.0% or less:
• 1.50<0.4Cr+0.4Mo+4.5V<2.45 (1)
• 2.20<2.7C+0.4Si+Mn+0.45Ni+0.8Cr+Mo+V<2.80 (2)
• Mo/V≥0.58 (3)
• (Mo+V+Cr)/(Mn+20P)≥2.40 (4)
• where each symbol of an element in Formula (1) to Formula (4) is to be substituted by a content of a corresponding element (mass %).