Case hardening bearing steel having excellent toughness and...

Details Case hardening bearing steel having excellent toughness and... Case hardening bearing steel having excellent toughness and...

2003-04-09

2008-08-19

Sheehan, John P. (Department: 1793)

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

C148S319000, C148S906000

Reexamination Certificate

active

07413704

ABSTRACT:
A case hardening bearing steel having an excellent rolling contact fatigue life in intermediate temperature, in addition, excellent toughness at room temperature is provided. Specific means for solving the problems are as follows. The composition contains, by mass percent, C of 0.15 to 0.30 mass percent, Si of 0.5 to 2.0 mass percent, Mn of 0.3 to 2.0 mass percent, Cr of 1.3 to 2.5 mass percent, Mo of 0.3 to 1.0 mass percent, and O of not more than 0.0012 mass percent in a range where (Si+Mo)≧1.0 mass percent is satisfied, and contains iron and inevitable impurities as remnant; the maximum size of oxide nonmetallic inclusion is not more than 12.5 μm when examined area is 320 mm2; number of the oxide nonmetallic inclusion having a diameter of equivalent circle of 3 μm or more is not more than 250 when the examined area is 320 mm2; in addition, C density of an outer layer is adjusted to be in a range from 0.7 to 1.2 mass percent by carburization.

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Davis et al., ASM Handbook, 1995 International, vol. 4, pp. 312-315.

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