Method for making a coated steel part having very high...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/78 (2006.01) C23F 17/00 (2006.01)

Patent

CA 2599187

The invention concerns a method for making a part with very high mechanical characteristics from a hot- or cold-rolled steel strip, comprising precoating said strip with aluminum or an aluminum alloy, cold process deformation of the coated strip, optionally cutting off excess plate metal in view of the final shape of the part, heating the part so as to produce an intermetallic compound from the steel-coating interface and to austenize the steel, transferring the part into an equipment, cooling the part inside the equipment at a speed such that the steel structure after cooling is martensitic, or bainitic or martensito-bainitic. The precoating is performed by electroplating, chemical or physical vapour deposition, or combined rolling.

L'invention concerne un procédé de fabrication d'une pièce à très hautes caractéristiques mécaniques à partir d'une bande d'acier laminée à chaud ou à froid, comportant un pré-revêtement de ladite bande par de l'aluminium ou un alliage d'aluminium, une déformation à froid de la bande revêtue, une découpe éventuelle des excédents de tôle en vue de la géométrie finale de la pièce, un chauffage de la pièce de façon à réaliser un composé intermétallique à partir de l'interface acier-revêtement et à austénitiser l'acier, un transfert de la pièce au sein d'un outillage, un refroidissement de la pièce au sein de l'outillage avec une vitesse telle que la structure de l'acier après refroidissement soit martensitique, ou bainitique ou martensito-bainitique. Le pré-revêtement est effectué par électrodéposition, dépôt chimique ou physique en phase vapeur, ou colaminage.

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