Carburized roller member made of high carbon chromium steel

Details Carburized roller member made of high carbon chromium steel Carburized roller member made of high carbon chromium steel

2007-04-24

2007-04-24

Bryant, David P. (Department: 3726)

Roll or roller

Single annular member, per se

Specific metallic composition

C492S059000, C148S225000, C148S233000, C148S906000

Reexamination Certificate

active

10628305

ABSTRACT:
A roller member comprising high carbon chromium bearing steel having a carburization treatment. The bearing steel comprising a surface portion defined as a range between a surface of a rolling face of the roller member to a depth where a maximum shearing stress acts thereon, the surface portion containing carbon in a total amount comprising a range of 1.0 to 1.6 wt % and an amount of residual austenite comprising a range of 20 vol % to 35 vol % wherein a compression residual stress of the surface portion comprises a range of 150 to 1000 MPa, wherein a surface hardness of the surface portion comprises a range of 64 or higher in Rockwell C hardness, wherein an amount of carbide precipitate on the surface portion comprises a range of 10% to 25% in an area rate and each carbide particle size comprises a range of 3 μm or less.

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Chinese Office Action dated Oct. 20, 2006 with English translation.

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