Galvanized steel sheet and method for manufacturing the same

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 2/06 (2006.01) C21D 9/46 (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)

Patent

CA 2745195

A galvanized steel sheet includes a zinc plating layer which is disposed on a steel sheet containing 0.01% to 0.15% C, 0.001% to 2.0% Si, 0.1% to 3.0% Mn, 0.001% to 1.0% Al, 0.005% to 0.060% P, and 0.01% or less S on a mass basis, the remainder being Fe and unavoidable impurities, and which has a mass per unit area 20 g/m2 to 120 g/m2. An oxide of at least one selected from the group consisting of Fe, Si, Mn, Al, and P is present in a surface portion of the steel sheet that lies directly under the zinc plating layer and that extends up to 100 µm from the surface of a base steel sheet. The amount of the oxide per unit area is 0.05 g/m2 or less in total. The steel sheet has excellent corrosion resistance, anti-powdering property during heavy machining, and strength.

L'invention concerne une feuille d'acier galvanisée à chaud qui comporte une couche galvanisée formée sur les surfaces de la feuille d'acier et contient, en % en poids, C: 0,01- 0,15%, Si: 0,001-2,0%, Mn: 0,1-3,0%, Al: 0,001-1,0%, P: 0,005-0,060%, S: 0,01%, le reste comprenant du Fe et des impuretés inévitables. La valeur d'adhérence superficielle de la couche galvanisée est de 20-120 g/m2. On trouve une valeur totale égale ou inférieure à 0,05 g/m2 par surface d'un ou de plusieurs types d'oxydes sélectionnés dans le groupe comprenant des oxydes de Fe, Si, Mn, Al et P à l'intérieur de la partie de couche de surface de la feuille d'acier, à une profondeur de 100 µm au maximum de la depuis la feuille d'acier de base, directement au-dessous de la couche galvanisée. Cette feuille d'acier présente d'excellentes propriétés de résistance à la corrosion et de résistance au pelage de la couche galvanisée avec un degré élevé de traitement, et une excellente résistance.

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