Alloys or metallic compositions – Ferrous – Lead – bismuth – selenium – tellurium or calcium containing
Patent
1995-03-02
1996-05-21
Yee, Deborah
Alloys or metallic compositions
Ferrous
Lead, bismuth, selenium, tellurium or calcium containing
420109, C22C 3844
Patent
active
055186858
ABSTRACT:
A steel for darburized gear having softening resistance, consisting essentially of, in weight percentages, 0.18 to 0.25% C, 0.45 to 1.00% Si, 0.40 to 0.70% Mn, 0.30 to 0.70% Ni, 1.00 to 1.50% Cr, 0.30 to 0.70% Mo, up to 0.50% Cu, 0.015 to 0.030% A1, 0.03 to 0.30% V, 0.010 to 0.030% Nb, up to 0.0015% O, 0.0100 to 0.0200% N and the balance consisting of Fe and inevitable impurity elements, wherein quenching at 820.degree. C. or higher after carburization does not cause any ferrite to be formed in a hardened structure of the core part of the carburized steel, and wherein, while tempering is generally performed at 160.degree. to 180.degree. C. after the quenching, reheating at any of temperatures inclusive of the tempering temperature and up to 300.degree. C. does not cause the hardness of a carburized case of the carburized steel to decrease by HV 50 or more from the one after the carburization, quenching and tempering.
REFERENCES:
patent: 4773947 (1988-09-01), Shibata et al.
Fukuzumi Tatsuo
Sakamoto Kazuo
Ueno Hideo
Mitsubishi Steel Mfg. Co. Ltd.
Yee Deborah
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