| abstract |
The present invention relates to improvements to methods of treatment under a controlled atmosphere.n n n An atmosphere formed of a carrier gas constituted by or containing industrially pure nitrogen and an active gas constituted by a hydrocarbon such as CH 4 , C 4 H 10 , C 3 H 8 , C 2 H 4 , is used, C 2 H 2 , C 2 H 6 and with carbon monoxide introduced in the form of pure gas or obtained by decomposition of methanol, the treatment being carried out between 750 ° and 1150 ° C.n n n The invention applies to heating before quenching, annealing, carburetion and carbonitriding of steels. |