A method of heating metal strip and apparatus therefor

C - Chemistry – Metallurgy – 21 – D

Patent

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Details

C21D 8/02 (2006.01) C21D 9/56 (2006.01) C21D 9/60 (2006.01) F27B 9/04 (2006.01) H05B 6/02 (2006.01) C21D 6/00 (2006.01)

Patent

CA 2361567

The invention concerns heating metal strips or other coilable strand metal object to an elevated temperature, wherein the metal object is passed in a heating section (5) through a furnace chamber (17) that is made at least partly of an insulating and electrically non-conductive material while being heated through transverse flux induction heating (TFIH) by means of transverse flux induction heating elements (15, 16) located outside of said chamber which contains a protective non-oxidising gas or gas mixture. The invention is characterised in that the metal object is a stainless steel object that has been cold rolled to a very high degree of surface reflectively, that the cold rolled stainless steel object is passed through said furnace chamber and is heated in said chamber to a processing temperature between 700 and 1200 ~C, that the cold rolled stainless steel object is maintained at said temperature between 700 and 1200 ~C for long enough for the steel to recrystallize completely, and that the heat treated metal object then is rapidly cooled directly from the processing temperature, in an airtight cooling section (6, 27) through which the non-oxidising gas is passed, to below a temperature of 600 ~C.

L'invention concerne un procédé permettant de chauffer, à température élevée, des bandes métalliques ou d'autres objets métalliques à brins enroulables, ces objets étant passés dans une section de chauffage (5) à travers une chambre de four (17) constituée au moins en partie d'un matériau isolant et électriquement non conducteur, tout en étant chauffés par induction en flux transversal (TFIH) au moyen d'éléments de chauffage (15, 16) par induction en flux transversal situés à l'extérieur de ladite chambre, qui contient un gaz protecteur non oxydant ou un mélange gazeux. L'invention est caractérisée en ce que l'objet métallique est en acier inoxydable qui a été laminé à froid jusqu'à présenter un brillant de surface optimisé, en ce que cet objet traverse la chambre de four et y est chauffé à une température de traitement comprise entre 700 et 1200 ·C, en ce que ledit objet est maintenu suffisamment longtemps à la température de traitement comprise entre 700 et 1200 ·C pour que l'acier se recristallise complètement, et en ce que l'objet métallique chauffé traité est ensuite rapidement refroidit, directement à partir de la température de traitement, dans une section de refroidissement étanche à l'air (6, 27) à travers laquelle passe le gaz non oxydant à une température inférieure à 600 ·C.

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