Steel for gear, gear superior in strength of tooth surface and m

Details Steel for gear, gear superior in strength of tooth surface and m Steel for gear, gear superior in strength of tooth surface and m

1995-03-07

1997-01-21

Yee, Deborah

Metal treatment

Stock

Carburized or nitrided

148206, 148211, C23C 822, C23C 832

Patent

active

055956130

ABSTRACT:
A steel for gears consists essentially of 0.10-0.30 wt % of C, not more than 1.0 wt % of Si, not more than 1.0 wt % of Mn, 1.50-5.0 wt % of Cr, and balance including iron and impurity. A gear made by the steel forms a hardened surface layer by carbonizing-hardening-tempering or carbonitriding-hardening-tempering. The amount of C at the hardened surface layer is within a range 0.7 to 1.3 wt %, and the amounts of C, Si and Cr satisfies a relationship 5.5<3.times.C (wt %)+5.2.times.Si (wt %)+Cr (wt %). Therefore, the gear performs superior pitting-resistance and wear-resistance.

REFERENCES:
patent: 3640114 (1972-02-01), Foley, Jr.
Japanese Industrial Standard--Structural Steels with Specified Hardenability Bands--JIS G 4052 (1979).
JIS B 0601--Definitions and Designation of Surface Roughness--pp. 398-408.

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