Bearing material

Details Bearing material Bearing material

2005-05-17

2005-05-17

Jenkins, Daniel (Department: 1742)

Alloys or metallic compositions

Ferrous

One percent or more carbon containing, but less than 1.7...

C420S100000, C420S101000

Reexamination Certificate

active

06893609

ABSTRACT:
A long-life bearing steel for general purpose use is provided at low cost with no use of specific secondary refining process. Specifically, a bearing material having a component composition in which C: 0.95 to 1.10 mass %, Si: 0.15 to 0.70 mass %, Mn: 1.15 mass % or less, Cr: 0.90 to 1.60 mass %, and P: 0.025 mass % or less are contained, S and O, that are elements forming nonmetallic inclusions, are contained at S: 0.025 mass % or less and O: 0.0012 mass % or less, and the rest is composed of Fe and incidental impurities, wherein the maximum diameter of the oxide-based nonmetallic inclusion is more than 10 μm, but 15 μm or less in an inspection area: 320 mm2, the number of oxide-based nonmetallic inclusions having an equivalent circle diameter of 3 μm or more is 250 or less in the inspection area: 320 mm2, while in the material, AlN is contained at 0.020 mass % or less, and or the number of sulfide-based nonmetallic inclusions having a thickness of 1 μm or more is 1,200 or less in the inspection area: 320 mm2.

REFERENCES:
patent: 5256213 (1993-10-01), Narai et al.
patent: 5960250 (1999-09-01), Yasumoto et al.

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