Coated steel sheet and method for manufacturing the same

Details Coated steel sheet and method for manufacturing the same Coated steel sheet and method for manufacturing the same

C - Chemistry, Metallurgy

23

C

C23C 2/06 (2006.01) C22C 38/00 (2006.01) C22C 38/06 (2006.01) C22C 38/58 (2006.01) C23C 2/02 (2006.01) C23C 2/28 (2006.01) C23C 22/12 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2459134

A coated steel sheet having a coated layer on surfaces of a steel sheet of a composition containing not less than 0.1 mass% and under 3 mass% of Al, wherein a following condition A or B is met: A: An AlN precipitate layer exists on a matrix side near an interface between said steel sheet and said coated layer B: Oxide of Al exists in said matrix right under said surfaces of said steel sheet.

L'invention concerne une plaque d'acier à surface traitée, qui comporte une plaque d'acier possédant une composition chimique qui contient au moins 0,1 % en masse et moins de 3 % d'Al et une couche de traitement de surface formée sur sa surface, caractérisée en ce qu'elle satisfait les besoins A ou B suivant: A: une couche de précipitation A1N est présente du côté de la fonte de base à proximité de l'interface située entre la plaque d'acier supérieure et la couche de traitement de surface supérieure, ou B: un oxyde d'Al est présent dans la fonte de base directement sous la surface de la plaque d'acier supérieure.

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