Galvanized or galvannealed silicon steel

Details Galvanized or galvannealed silicon steel Galvanized or galvannealed silicon steel

C - Chemistry, Metallurgy

23

C

C23C 2/02 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2695138

The invention deals with a hot-dip galvanized or galvannealed steel sheet wherein, the composition of the steel sheet comprises, by weight: 0.01 <= C<= 0.22%, 0.50 <= Mn <= 2.0%, 0.2 <= Si <= 3.0%, 0.005 <= Al <= 2.0%, Mo < 1.0%, Cr <= 1.0%, P < 0.02%, Ti <= 0.20%, V<= 0.40%, Ni <= 1.0%, Nb <= 0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, and the steel sheet comprises a layer of an internal nitride of at least one type of nitride selected from a Si nitride, Mn nitride, Al nitride, complex nitride comprising Si and Mn, or Al and Si, or Al and Mn, or complex nitride comprising Si, Mn and Al, said steel sheet comprising no further outer layer of iron nitride.

L'invention porte sur une tôle d'acier galvanisée ou recuite par galvanisation par immersion à chaud, la composition de la tôle d'acier comprenant, en poids, 0,01 = C = 0,22%, 0,50 = Mn = 2,0%, 0,2 = Si = 3,0%, 0,005 = Al = 2,0%, Mo < 1,0%, Cr = 1,0%, P < 0,02%, Ti = 0,20%, V = 0,40%, Ni = 1,0%, Nb = 0,20%, le reste de la composition étant du fer et des impuretés inévitables résultant de la fusion, et la tôle d'acier comprend une couche d'un nitrure interne d'au moins un type de nitrure choisi parmi un nitrure de Si, un nitrure de Mn, un nitrure d'Al, un nitrure complexe comprenant Si et Mn, ou Al et Si, ou Al et Mn, ou un nitrure complexe comprenant Si, Mn et Al, ladite tôle d'acier ne comprenant aucune autre couche externe de nitrure de fer.

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