Galvanized rolling-hardened cold-rolled flat product and...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/00 (2006.01) C21D 7/02 (2006.01)

Patent

CA 2634527

A flat product according to the invention which has been produced from a low- alloy steel containing iron and unavoidable impurities together with (in % by weight) up to 0.45% of C, up to 2.20% of Si, up to 2.50% of Mn, up to 0.12% of P, up to 0.025% of S, up to 2.0% of Al, up to 0.15% of Ti, up to 0.09% of Nb, a total of up to 1.0% of Cr and Mo, up to 0.2% of V and up to 0.005% of B and has been cold-rolled to a thickness of 0.1-4 mm and is in the rolling-hardened state has a tensile strength of 700-1000 MPa and is coated with a zinc layer which has been applied by electrolytic galvanization and has a layer thickness of up to 12 ~m. The cold-rolled flat product of this type provides a steel sheet or strip which has not only a particularly high strength but also a high corrosion resistance. In addition, the invention provides a process for producing such a flat product.

L'invention concerne un produit plat laminé à froid à une épaisseur de 0,1 à 4 mm, en acier peu allié qui en plus du fer et des impuretés inévitables contient (en % en poids) jusqu'à 0,45 % de C, jusqu~à 2,20 % de Si, jusqu~à 2,50 % de Mn, jusqu~à 0,12 % de P, jusqu~à 0,025 % de S, jusqu~à 2,0 % d'Al, jusqu~à 0,15 % de Ti, jusqu~à 0,09 % de Nb, au total jusqu~à 1,0 % de Cr et de Mo, jusqu~à 0,2 % de V et jusqu~à 0,005 % de B. A l'état durci par laminage, le produit plat présente une résistance en traction de 700 à 1 000 MPa et est recouvert d'une couche de zinc appliquée par galvanisation électrolytique et a une épaisseur de couche qui peut aller jusqu~à 12 µm. Le produit plat laminé à froid ainsi produit est une tôle ou un feuillard d'acier qui, en plus d'une résistance mécanique particulièrement élevée, présente une haute résistance à la corrosion. L'invention concerne en outre un procédé de fabrication de ce produit plat.

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