Method for producing gears and/or shaft components with...

Details Method for producing gears and/or shaft components with... Method for producing gears and/or shaft components with...

2008-06-10

2008-06-10

King, Roy (Department: 1793)

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

C148S218000, C148S225000, C148S230000

Reexamination Certificate

active

07384488

ABSTRACT:
A conventional aluminum killed alloy steel for case hardening of gear(s) and/or shaft components consisting of 0.10 to 0.30 weight % Carbon, 0.15 to 0.35 weight % Silicon, 0.8 to 1.5 weight % Chromium, 0.6 to 1.5 weight % Manganese, 0.017 to 0.040 weight % Aluminum, and balance iron including impurities, produced by vacuum degassing and alike routes. Gear(s) and/or shaft components made by the above steel when treated by modified carbonitriding followed by hard shot peening process provide both superior bending fatigue strength and pitting fatigue life, capable of withstanding higher torque levels and speeds.

REFERENCES:
patent: 5019182 (1991-05-01), Arimi
patent: 5595610 (1997-01-01), Maeda et al.
patent: 5595613 (1997-01-01), Hatano et al.
patent: 6309475 (2001-10-01), Takayama et al.
patent: 6413328 (2002-07-01), Takayama et al.
patent: 6447619 (2002-09-01), Takayama et al.
patent: 2002/0119858 (2002-08-01), Kino et al.

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