| 摘要 |
PROBLEM TO BE SOLVED: To provide a bearing steel material exhibiting good cold-workability when bearing components are manufactured by cold-working.SOLUTION: A bearing steel material satisfies a predetermined elemental composition, and further satisfies, in a parent phase region (interface region) from the surface of spheroidized cementite to a position of 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 is characterized in that the circularity coefficient of the spheroidized cementite is at least 0.80. |
