Method for manufacturing very high strength, cold-rolled,...

Details Method for manufacturing very high strength, cold-rolled,... Method for manufacturing very high strength, cold-rolled,...

C - Chemistry, Metallurgy

22

C

C22C 38/04 (2006.01) C21D 8/02 (2006.01) C23C 2/02 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2725290

The invention relates to an annealed, cold-rolled, dual phase steel sheet having a strength of 980 to 1100 MPa and an elongation at break greater than 9%, comprising the following composition (as expressed in wt.-%): 0.055% = C = 0.095%, 2% = Mn = 2.6%, 0.005% = Si = 0.35%, S = 0.005%, P = 0.05%, 0.1 = Al = 0.3%, 0.05% = Mo = 0.25%, 0.2% = Cr = 0.5%, assuming that Cr+2Mo = 0.6%, Ni = 0.1%, 0.01 = Nb = 0.04%, 0.01 = Ti = 0.050%, 0.0005 = B = 0.0025%, 0.002% = N = 0.007%, the remainder of the composition consisting of iron and inevitable impurities resulting from production.

L'invention concerne une Tôle d'acier Dual Phase laminée à froid et recuite de résistance comprise entre 980 et 1100MPa, d'allongement à rupture supérieur à 9 %, dont la composition comprend, les teneurs étant exprimées en poids : 0,055% <= C<= 0,095%, 2% <= Mn <= 2,6%, 0,005% <= Si <= 0,35%, S<= 0,005%, P<= 0,050%, 0,1 <= AI <= 0,3%, 0,05% <= Mo <= 0,25%, 0,2% <= Cr <= 0,5%, étant entendu que Cr+2Mo <= 0,6%, Ni <= 0,1%, 0,010 <= Nb <= 0,040%, 0,010 <= Ti <= 0,050%, 0,0005 <= B<= 0,0025%, 0,002% <= N<= 0,007%, le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration.

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