HEAT TREATMENT UNDER A CONTROLLED PROTECTIVE ATMOSPHERE

Process for the heat treatment of low-alloy steels at temperatures higher than 600 DEG C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon CxHy and optionally hydrogen, with a control...

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Bibliographische Detailangaben
Hauptverfasser:	PASCAL BALDO, ERIC DUCHATEAU
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
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Beschreibung
Zusammenfassung:	Process for the heat treatment of low-alloy steels at temperatures higher than 600 DEG C., such as annealing or heating before hardening, etc., said treatment being carried out in a protection atmosphere produced by the injection of nitrogen, hydrocarbon CxHy and optionally hydrogen, with a control of the atmosphere. According to the invention, the composition of the residual species CH4, CO, H2O, and the temperature of the gaseous mixture in the furnace are controlled in order to control the carburization and the decarburization of the treated steels.