High strength cold rolled steel sheet having excellent...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/44 (2006.01) C21D 8/04 (2006.01) C22C 38/12 (2006.01) C22C 38/42 (2006.01) C22C 38/54 (2006.01) C22C 38/58 (2006.01) C21D 1/18 (2006.01)

Patent

CA 2067043

Disclosed is a high strength cold rolled steel sheet having excellent non-aging property at room temperature and excellent drawability. The steel sheet has a dual-phase structure composed of a high-temperature transformed ferrite phase and a low-temperature transformed ferrite phase having high dislocation density and a composition by weight % of 0.001 to 0.025 C; not more than 1.0 Si; 0.1 to 2.0 Mn; 0.001 to 0.2 Nb; 0.0003 to 0.01 B; 0.005 to 0.10 Al; not more than 0.1 P, not more than 0.007 N; at least of 0.05 to 3.0 Ni; 0.01 to 2.0 wt% of Mo and 0.05 to 5.0 wt% of Cu, and the balance substantially Fe.

Cette invention concerne une tôle d'acier haute résistance laminé à froid, caractérisée par une excellente résistance au vieillissement à la température ambiante et une excellente aptitude à l'emboutissage. La tôle d'acier a une structure diphasique composée d'une phase ferritique transformée à haute température et d'une phase ferritique transformée à basse température, caractérisée par une haute densité de dislocations et dont la composition en masse est la suivante : de 0,001 à 0,025 % de C; au plus 1,0 % de Si; de 0,1 à 2,0 % de Mn; de 0,001 à 0.2 % de Nb; de 0,0003 à 0,01 % de B; de 0,005 à 0,10 % de Al; au plus 0,1 % de P, au plus 0,007 % de N; et au moins de 0,05 à 3,0 % de Ni; de 0,01 à 2,0 % de Mo et de 0,05 à 5,0 % de Cu, le reste étant essentiellement du fer.

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