C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
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 2742661
A galvanized steel sheet is composed of a basal steel sheet containing elements C: 0.01 to 0.15%, Si: 0.001 to 2.0%, Mn: 0.1 to 3.0%, Al: 0.001 to 1.0%, P: 0.005 to 0.060%, and S<=0.01%, all in percent by mass, and Fe and unavoidable impurities as the balance; zinc plating layers formed on both sides of the basal steel sheet with the amount of plating per side in the range of 20 to 120 g/m2; one or more kinds of oxides selected from Fe, Si, Mn, Al, and P oxides and existing in steel sheet superficial portions, namely, the portions located in direct contact with the zinc plating layers and extending from each surface of the basal steel sheet to a depth of 100 µm, with the total amount of the oxides per side in the range of 0.01 to 0.5 g/m2; and a crystalline oxide existing in the regions from each surface of the basal steel sheet to a depth of 10 µm, which are also located in direct contact with the zinc plating layers, the crystalline oxide composed of Fe crystal grains in which Si and Mn atoms are so contained as to be distributed in the regions from grain boundaries to a depth of 1 µm. This steel sheet is very strong and highly capable of retaining plating during heavy-handed processing.
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 de 0,01-0,05 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 depuis la feuille d'acier de base, directement au-dessous de la couche galvanisée, et des oxydes cristallins contenant Si et Mn dans les grains de cristal de Fe jusqu'à 1 µm depuis la limite de grains cristallins de Fe dans la zone allant jusqu'à 10 µm de profondeur depuis la surface de la feuille d'acier de base, directement sous la couche galvanisée. Ladite feuille d'acier présente un niveau élevé de résistance ainsi qu'une excellente résistance au pelage de la couche galvanisée avec un degré de traitement élevé.
Fushiwaki Yusuke
Sugimoto Yoshiharu
Jfe Steel Corporation
Moffat & Co.
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