Apparatus and method for forming heat treating atmospheres

Details Apparatus and method for forming heat treating atmospheres Apparatus and method for forming heat treating atmospheres

C - Chemistry, Metallurgy

21

D

C21D 1/74 (2006.01) C21D 1/76 (2006.01)

Patent

CA 2199099

The present invention is directed to a method for forming a heat treating atmosphere in which a nitrogen rich gas containing small amounts of oxygen is preheated. An oxygen-reactive gas, such as a hydrocarbon gas, is combined with the nitrogen rich gas and the mixture is reacted outside of the furnace at temperatures above which substantial sooting does not occur. The resulting heat treating atmosphere is then forwarded to the furnace for conducting the heat treating process.

Méthode pour l'obtention d'un atmosphère de traitement thermique, consistant à préchauffer un gaz riche en azote, renfermant de petites quantités d'oxygène. Un gaz réactif avec l'oxygène, comme un hydrocarbure, est combiné avec le gaz riche en azote; on fait ensuite réagir le mélange à l'extérieur du four à une température au-dessus de laquelle il ne se forme pas de grandes quantités de suie. L'atmosphère de traitement thermique ainsi obtenue est ensuite introduite dans le four où est appliqué le procédé de traitement thermique.

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