HEAT TREATMENT UNDER A CONTROLLED PROTECTIVE ATMOSPHERE

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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Hauptverfasser: PASCAL BALDO, ERIC DUCHATEAU
Format: Patent
Sprache:eng
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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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creator PASCAL BALDO
ERIC DUCHATEAU
description 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.
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subjects 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
title HEAT TREATMENT UNDER A CONTROLLED PROTECTIVE ATMOSPHERE
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