Oblon, McClelland, Maier & Neustadt, L.L.P.
Bearing steel excellent in rolling-contact fatigue properties and method for producing same
A bearing component having increased rolling-contact fatigue life, the bearing component being made of a bearing steel that satisfies a predetermined chemical composition, and Si (boundary Si), Mn (boundary Mn), Cr (boundary Cr), Cu (boundary Cu), Ni (boundary Ni), and Mo (boundary Mo) included in a matrix phase region (boundary surface region) from the surface of spheroidized cementite to 20 nm away satisfy the formula:9.0≦1.4×boundary Si+1.8×boundary Mn+5.5×boundary Cu+4.2×boundary Ni+4.8×boundary Cr+5.5×boundary Mo.
Kobe Steel, Ltd.
C C F C C C C C F C C C C C C C C C
C21D C22C F16C C22C C22C C22C C21D C21D F16C C22C C21D C22C C22C C21D C22C C21D C21D C21D
inventional inventional additional inventional inventional inventional inventional inventional additional inventional inventional inventional inventional additional inventional inventional inventional inventional
Yosuke Masaki Manabu
Shindo Kaizuka Fujita