Process for the production of clad products

Claim 1

IN THE PROCESS FOR THE PRODUCTION OF CLAD PRODUCTS IN WHICH AT LEAST ONE FERROUS BASE METAL LAYER AND ONE CLADDING METAL LAYER SELECTED FROM THE GROUP CONSISTING OF A FERROUS METAL OF DIFFERENT CHARACTERISTICS THAN THE BASE METAL LAYER, NON FERROUS METALS AND ALLOYS OF NON FERROUS METALS ARE ASSEMBLED IN A SEALED CLADDING PACKET AND SUBJECTED TO DEFORMATION AFTER HEATING, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN SAID PACKET AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF CERIUM, MANGANESE, ALUMINUM, ALLOYS AND MIXTURES THEREOF, CAPABLE OF REACTING WITH NITROGEN AND OXYGEN, AFFIXING SAID GROUP MEMBER IN THE FORM OF A THIN LAYER ADJACENT THE INNER SURFACE OF ONE OF THE OUTER WALLS OF THE CALDDING PACKET NOT CONSTITUTING A SURFACE OF ONE OF SAID METAL LAYERS, SEALING SAID CLADDING PACKET, APPLYING HEAT TO SAID METAL GROUP MEMBER FROM AN EXTERNAL HEAT SOURCE, CAUSING SAID METAL GROUP MEMBER TO BE BROUGHT TO A TEMPERATURE AT WHICH THE SAME RAPIDLY AND READILY REACTS WITH THE NITROGEN AND OXYGEN PRESENT IN SAID SEALED PACKET, SAID TEMPERATURE BEING LOWER THAN THE TEMPERATURE REQUIRED FOR THE REACTION OF SAID CLADDING LAYER AND SAID BASE METAL LAYER WITH NITROGEN AND OXYGEN BUT BEING SUFFICIENT TO EFFECT REACTION OF SAID METAL GROUP MEMBER.