Process for avoiding surface oxidation in the carburization of s

Details Process for avoiding surface oxidation in the carburization of s Process for avoiding surface oxidation in the carburization of s

1994-10-06

1996-03-12

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148207, 148218, 148225, 148280, C21D 900, C21D 174

Patent

active

054982995

ABSTRACT:
The surface oxidation under carburization temperatures of steels during the carburization with carbon-containing gas mixtures is avoided by heating the steels to the carburization temperature under a nitrogen/hydrogen mixture or pure hydrogen. For carburization, these gases are replaced by a carbon-containing gas mixture whose oxygen activity is smaller than that required for the formation of manganese(II) oxide or chromium(III) oxide.

REFERENCES:
patent: 4049473 (1977-09-01), Davis
patent: 4175986 (1979-11-01), Ewalt
patent: 4769090 (1988-09-01), Queille
patent: 4935073 (1990-06-01), Bartlett
patent: 5045126 (1991-09-01), Comier
patent: 5143558 (1992-09-01), Smith

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