Hot forged product with excellent fatigue strength, method...

Metal treatment – Stock – Ferrous

Reexamination Certificate

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C148S639000, C148S643000, C148S644000, C148S649000, C148S902000

Reexamination Certificate

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07806992

ABSTRACT:
A hot forged product including hardened areas introduced by partial cooling after hot forging, and unhardened areas, wherein Vickers hardness V1of the hardened areas on the surface and Vickers hardness V2of the unhardened areas satisfy the following formula (1): (V1−V2)/V2: 0.1 to 0.8.

REFERENCES:
patent: 5759309 (1998-06-01), Watts et al.
patent: 3100492 (2000-08-01), None
patent: 2002-226938 (2002-08-01), None
patent: 2003-193139 (2003-07-01), None
patent: 2004-060003 (2004-02-01), None
patent: 2004-60003 (2004-02-01), None
patent: 2003-76396 (2003-09-01), None
Machine- English translation of Japanese patent 2002-226938, Kitano Shuhei, Aug. 14, 2002.
Machine-English translation of Japanese patent 2004-060003, Morishima Takeshi, Feb. 26, 2004.
“Martensite Transfomation in iron-carbon alloys”, pp. 141-142, Structure and Properties of Engineering Materials, Brick et al. 1977.
English abstract of Japanese patent 408176733, Koji Izumi et al., Jul. 9, 1996.
“Denko Giho,” Denki Kogyo Co., Ltd., vol. 37, 2003, pp. 52-56 w/English translation and Verification of Translation.

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