High strength hot-dip galvanized steel sheet and method for...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/26 (2006.01) C21D 9/46 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C22C 38/38 (2006.01) C23C 2/06 (2006.01) C21D 8/02 (2006.01)

Patent

CA 2407384

The invention relates to a high strength hot-dip galvanized steel sheet consisting essentially of 0.03 to 0.25% C, 0.7% or less Si, 1.4 to 3.5% Mn, 0.05% or less P, 0.01% or less S, 0.05 to 1% Cr, 0.005 to 0. 1% Nb, by mass, and balance of Fe, and being made of a composite structure of ferrite and secondary phase, and having an average grain size of the composite structure of 9M or smaller. Since the high strength hot-dip galvanized steel sheet of the present invention hardly induces softening at HAZ during welding, it is applicable to structural members of automobiles for "Tailor Welded Blanks" (TWB).

La présente invention concerne une tôle d'acier zinguée à chaud présentant une grande résistance. Sa composition chimique en masse est sensiblement la suivante : C : 0,03 à 0,25 %, Si : <= 0,7 %, Mn : 1,4 à 3,5 %, P : <= 0,05 %, S : <= 0,01 %, Cr : 0,05 à 1 %, Nb : 0,005 à 0,1 % et le reste : Fe. Cette tôle d'acier comprend une structure composite qui est composée de ferrite et d'une seconde phase et qui présente un diamètre granulaire moyen inférieur ou égal à 10 µm. Ladite tôle d'acier zinguée à chaud présentant une grande résistance est avantageuse en ce que lorsqu'elle est soudée, la zone thermiquement affectée de la tôle d'acier est moins sensible à un adoucissement, ce qui la rend adaptée à un usage en tant qu'élément structural d'une automobile mettant en oeuvre un matériau d'ébauche façonné.

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