Steel gear

Details Steel gear Steel gear

1995-09-29

1998-05-05

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

420105, 420108, 420109, C22C 3822, C22C 3844

Patent

active

057468427

ABSTRACT:
Steel for forming a gear by carburizing and quenching consisting essentially of: 0.1 to 0.35 wt. % C, 0.5 to 2.5 wt. % Si, 0.2 to 2.5 wt. % Mn, 0.01 to 2.5 wt. % Cr, 0.01 to 0.7 wt. % Mo, and the balance being Fe and inevitable impurities. The steel has an Ac.sub.3 point parameter (Ac.sub.3) and an ideal critical diameter (D.sub.I), the Ac.sub.3 point parameter being in a range of 850.degree. to 960 .degree. C., the ideal critical diameter (D.sub.I) being in a range of 30 to 250 mm, and the Ac.sub.3 point parameter (Ac.sub.3) and the ideal critical diameter (D.sub.I) being defined by the following equations.

REFERENCES:
patent: 1544422 (1925-06-01), Becket
patent: 3713905 (1973-01-01), Philip et al.
patent: 4175987 (1979-11-01), Rice
patent: 4773947 (1988-09-01), Shibata et al.
Patent Abstracts of Japan, vol. 17, No. 394 (C-1088) 23 Jul. 1993 of JP-A-05 070 924 (Nippon Steel Corp.), 23 Mar. 1993.
Patent Abstracts of Japan, vol. 12, No. 297 (C-519), 12 Aug. 1988 of JP-A-63 065 053 (Kobe Steel Ltd.), 23 Mar. 1988.
Patent Abstracts of Japan, vol. 16, No. 198 (C 0939), 13 May 1992 of JP-A-04 032 537 (Nissan Motor Co., Ltd.), 4 Feb. 1992.
Patent Abstracts of Japan, vol. 14, No. 304 (C-734), 29 Jun. 1990 of JP-A-02 101 154 (Kawasaki Heavy Ind. Ltd.), 12 Apr. 1990.

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