Steel material to be starting material of carbonitrided bearing component

1. A steel material comprising 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, in its microstructure, a total area fraction of ferrite and pearlite is 10.0% or more, and the balance is bainite, and

a proportion of a content of V (mass %) in electrolytic extraction residue to the content of V (mass %) in the chemical composition is 10.0% 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 %).

2. The steel material according to claim 1 , wherein at least one of the elements selected from the group consisting of Cu, Ni, B, Nb and Ti is present in the following amount:

Cu: 0.01 to 0.20%,

Ni: 0.01 to 0.20%,

B: 0.0001 to 0.0050%,

Nb: 0.005 to 0.100%, and

Ti: 0.005 to 0.100%.

3. The steel material according to claim 1 , wherein the Ca content is 0.0001 to 0.0010%.

4. The steel material according to claim 2 , where the CA content is 0.0001 to 0.0010%.