C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/02 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)
Patent
CA 2701091
The invention deals with a process for manufacturing a hot-dip galvannealed steel sheet having a TRIP microstructure, and comprising, by % by weight, 0.01 <= C <= 0.22%, 0.50 <= Mn <= 2.0%, 0.5 < Si <= 2.0%, 0.005 <= Al <= 2.0%, Mo < 0.01 %, 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, said process comprising the steps consisting in: - oxidizing said steel sheet in order to form a layer of iron oxide on the surface of the steel sheet, and to form an. internal oxide of at least one type of oxide selected from the group consisting of Si oxide, Mn oxide, Al oxide, complex oxide comprising Si and Mn, complex oxide comprising Si and Al complex oxide comprising Al and Mn, and complex comprising Si, Mn and Al, - reducing said oxidized steel sheet in order to reduce the layer of iron oxide, - hot-dip galvanising said reduced steel sheet to form a zinc-based coated steel sheet, and - subjecting said zinc-based coated steel sheet to an alloying treatment to form a galvannealed steel sheet.
L'invention porte sur un procédé de fabrication d'une tôle d'acier recuite par galvanisation par immersion à chaud, ayant une microstructure TRIP, et comprenant, en pourcentage en poids, 0,01 = C = 0,22%, 0,50 = Mn = 2,0%, 0,5 < Si = 2,0%, 0,005 = Al = 2,0%, Mo < 0,01 %, 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, ledit procédé comprenant les étapes consistant à : oxyder ladite tôle d'acier afin de former une couche d'oxyde de fer sur la surface de la tôle d'acier, et de former un oxyde interne d'au moins un type d'oxyde choisi dans le groupe constitué par l'oxyde de Si, l'oxyde de Mn, l'oxyde d'Al, un oxyde complexe comprenant Si et Mn, un oxyde complexe comprenant Si et Al, un oxyde complexe comprenant Al et Mn, et un complexe comprenant Si, Mn et Al, réduire ladite tôle d'acier oxydée afin de réduire la couche d'oxyde de fer, galvaniser par immersion à chaud ladite tôle d'acier réduite pour former une tôle d'acier revêtue à base de zinc, et soumettre ladite tôle d'acier revêtue à base de zinc à un traitement d'alliage pour former une tôle d'acier recuite par galvanisation.
Bertrand Florence
Mataigne Jean-Michel
Arcelormittal France
Nippon Steel Corporation
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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