Method of nitriding steel

Details Method of nitriding steel Method of nitriding steel

1996-05-16

1997-07-22

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148231, 148232, C23C 826

Patent

active

056500220

ABSTRACT:
A method of nitriding steel which comprises reacting the steel surface with nitrogen so as to form a hard nitrided layer, and, prior to nitriding, holding steel under a gas atmosphere containing fluorine compound gas or fluorine gas and also containing air of 0.5 to 20 volume % of the total or oxygen gas of 0.1 to 4 volume % of the total with heating, whereby occurrence of uneven nitriding is prevented and at the same time savings in consumption of expensive fluorine- or fluoride-containing gas can be realized.

REFERENCES:
patent: 5013371 (1991-05-01), Tahara et al.
patent: 5254181 (1993-10-01), Yoshio et al.
patent: 5340412 (1994-08-01), Yoshino et al.

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