Morrison Law Firm
Bearing race member and method of fabrication
 A bearing race member composed of steel containing 0.60 to 0.85% carbon by weight, 0.5 to 1.0% by weight in a single content or total contents of Si and Al, and 13 ppm or less oxygen, wherein said bearing race member is quenched and subsequently tempered to contain 15% or less retained austenite therein. Even though basically made of structural carbon steel, the bearing race member has a long life equal to that of high-carbon chromium bearing steel and is superior in dimensional stability and crack fatigue strength. 
N.T.N. Corporation
F C Y C F Y C
F16C C22C Y10S C21D F16C Y10S C22C
additional inventional additional inventional inventional additional inventional
Hiroshi Hirokazu Noriyuki Hirotsugu
Yamada Nakajima Tsushima Hamaoka