An ultra high strength steel composition, the process of...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/04 (2006.01) C21D 8/02 (2006.01) C22C 38/00 (2006.01) C22C 38/02 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C22C 38/18 (2006.01) C22C 38/22 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C23C 2/02 (2006.01)

Patent

CA 2456495

The present invention is related to a steel composition, a process for producing a steel product having said composition, and said steel product itself. According to the invention, a cold-rolled, possibly hot dip galvanised steel sheet is produced with thicknesses lower than 1mm, and tensile strengths between 800MPa and 1600MPa, while the A80 elongation is between 5 and 17%, depending on the process parameters. The composition is such that these high strength levels may be obtained, while maintaining good formability and optimal coating quality after galvanising. The invention is equally related to a hot rolled product of the same composition, with higher thickness (typically about 2mm) and excellent coating quality after galvanising.

L'invention concerne une composition d'acier, un procédé pour fabriquer un produit en acier comportant cette composition, et le produit lui-même. Selon l'invention, une feuille d'acier laminée à froid, éventuellement galvanisée à chaud, est fabriquée, cette feuille ayant une épaisseur inférieure à 1 mm, une résistance à la traction entre 800 MPa et 1600 MPa, son allongement A80 étant de 5 à 17 %, en fonction des paramètres de fabrication. La composition est telle qu'elle permet d'obtenir ces hauts niveaux de résistance, tout en maintenant une bonne aptitude au formage et une qualité de revêtement optimale après galvanisation. La présente invention porte également sur un produit laminé à chaud, de même composition mais plus épais (typiquement d'environ 2 mm), présentant une excellente qualité de revêtement après galvanisation.

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