Method for gaseous carburization of steel

US4881982A · kind A · utility

Assignee

• Ipsen Industries International GmbH · DE

Inventors

• Bernd Edenhofer · Kleve, DE
• Hans Pfau · Kleve, DE

Key dates

• Filing date: Apr 25, 1988
• Grant date: Nov 21, 1989
• Expiry date: Apr 25, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C8/22
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for gaseous carburization of steel, where, in a carbon-rich gaseous atmosphere, an article that is to be carburized is, in a first carburization phase, exposed to a carbon charge that is as great as possible, at the black limit, and, in a subsequent diffusion phase, a lower carbon charge that corresponds to the desired carbon content at the surface of the article is established, with carburization being regulated via the two target values carbon content at the surface and depth of carburization. In order, independent of the carbide limit, to provide a regulation with which it is possible to achieve in a straightforward manner, reliably and reproducibly, the desired carbon content curve (carbon profile) in the article, at least one further target value that is characteristic of the carbon content curve is used to regulate the carburization. When this additional target value is reached, the carbon level that characterizes the carburization phase is reduced, and the diffusion phase is initiated.