High strength galvanized steel sheet excellent in...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/38 (2006.01) C21D 9/46 (2006.01) C22C 38/02 (2006.01) C22C 38/06 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C22C 38/34 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2712096

A high strength galvanized steel sheet having a TS of 780 MPa or more and exhibiting excellent stretch frangeability and bendability and a method for manufacturing the same are provided. The component composition contains C: 0.05% to 0.15%, Si: 0.8% to 2.5%, Mn: 1.5% to 3.0%, P: 0.001% to 0.05%, S: 0.0001% to 0.01%, Al: 0.001% to 0.1%, N: 0.0005% to 0.01%, Cr: 0.1% to 1.0%, Ti: 0.0005% to 0.1%, B: 0.0003% to 0.003%, and the remainder composed of iron and incidental impurities, on a percent by mass basis. The microstructure includes 30% or more of ferrite phase and 30% or more, and 70% or less of martensite phase on an areal fraction basis, wherein regarding the above-described martensite phase, the proportion of a tempered martensite phase is 20% or more relative to the whole martensite phase and the proportion of a martensite phase having a grain diameter of 1 µm or less is 10% or less relative to the whole martensite phase.

L'invention concerne une tôle d'acier galvanisée par immersion à chaud de résistance élevée ayant une valeur de TS supérieure ou égale à 780 MPa et ayant d'excellentes propriétés de dilatation de trous et une excellente aptitude au pliage. L'invention concerne également un procédé pour produire la tôle d'acier. La tôle d'acier a la composition chimique suivante (en % en masse) : C : 0,05-0,15 %, Si : 0,8-2,5 %, Mn : 1,5-3,0 %, P : 0,001-0,05 %, S : 0,0001-0,01 %, Al : 0,001-0,1 %, N : 0,0005-0,01 %, Cr : 0,1-1,0 %, Ti : 0,0005-0,1 % et B : 0,0003-0,003 %, le reste étant du fer et des impuretés inévitables. La tôle d'acier a une structure composée d'une phase de ferrite en proportion surfacique supérieure ou égale à 30 % et d'une phase de martensite en proportion surfacique de 30 à 70 % (inclus), une phase de martensite revenue représentant 20 % ou plus de la surface totale de la phase de martensite et une phase de martensite ayant un diamètre des particules inférieur ou égal à 1 µm représentant 10 % ou moins de la surface totale de la phase de martensite.

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