Process for manufacturing corrosion resistant metal products

Details Process for manufacturing corrosion resistant metal products Process for manufacturing corrosion resistant metal products

C - Chemistry, Metallurgy

23

F

C23F 15/00 (2006.01) B21B 9/00 (2006.01) B21B 47/00 (2006.01) B22F 3/10 (2006.01)

Patent

CA 2154064

A method is disclosed of producing a corrosion resistant product from a billet comprising a core of finely divided ferrous swarf compacted into briquettes in a stainless steel jacket and in which the billet is heated to a temperature at which it becomes sufficiently plastic to be worked into a finished or semi-finished product by an operation such as rolling. An additive is pre-mixed with the swarf which, when the billet is heated, reacts to form an atmosphere inside the jacket which displaces or prevents the formation of carbon dioxide and/or other gases which at elevated temperatures would oxidise the stainless steel to form chrome oxides at the interface between the jacket and the core. The additive is preferably in powder form. Examples of suitable additives include urea and ammonium chloride.

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