Metal treatment – Stock – Ferrous
Patent
1996-10-17
1998-09-08
Yee, Deborah
Metal treatment
Stock
Ferrous
148328, 148573, 148587, 148588, 148651, C22C 3804, C22C 3806, C21D 800
Patent
active
058039937
ABSTRACT:
The present invention provides an outer ring for a high strength constant velocity joint which has an excellent torsional strength and torsional fatigue strength and can provide an improved processability, and a process for producing the same. An outer ring used for a high strength constant velocity joint having an involute serration part and a screw part, the outer ring made of a steel containing:
C: 0.45 to 0.53%, Si: 0.05 to 0.25%, Mn: 0.7 to 1.0%, Al: 0.01 to 0.05%, Mo: 0.2 to 0.4%, N: 0.003 to 0.012%, the remainder being Fe and inevitable impurities, the inevitable impurities including:
Cr: 0.05% or less than 0.05%, P: 0.015% or less than
0.015%, S: 0.01% or less than 0.01%, and O: 0.002% or
less than 0.002%,
wherein an old austenite crystal grain at the involute serration end is 8 or more in JIS grain size classification; a surface hardness at the end is 720 or more in Hv; and a ratio (CD/R) is 0.35 to 0.60 where CD is an effective hardened layer depth at which a hardness at the end is 450 in Hv and R is a radius of a shaft part.
REFERENCES:
patent: 2774106 (1956-12-01), Bethe
patent: 3181199 (1965-05-01), Voelker
patent: 4201321 (1980-05-01), Patzelt et al.
Goto Tatsuhiro
Hasegawa Toyofumi
Kawasaki Toshio
Suwa Toshiki
Takeshita Hideo
NTN Corporation
Yee Deborah
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