| 摘要 |
This bearing steel material satisfies a predetermined elemental composition, and is characterized by having, in the region (interface region) from the boundary surface of a base material and spheroidized cementite to a position 20 nm away, no greater than 0.6% (excluding 0%) of Si (interface Si), no greater than 0.10% (excluding 0%) of Ni (interface Ni), no greater than 0.10% (excluding 0%) of Cu (interface Cu), no greater than 0.03% (including 0%) of Mo (interface Mo), no greater than 0.10% (excluding 0%) of Mn (interface Mn), and no greater than 0.9% (excluding 0%) of Cr (interface Cr), and the circularity coefficient of the spheroidized cementite being at least 0.80. The bearing steel material exhibits favorable cold-workability during the production of a bearing component by means of cold working. |
