Method of producing a steel component provided with a...

C - Chemistry – Metallurgy – 25 – D

Patent

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Details

C25D 3/56 (2006.01) C21D 8/02 (2006.01) C23C 2/40 (2006.01) C23F 17/00 (2006.01) C25D 5/48 (2006.01) C25D 5/50 (2006.01)

Patent

CA 2758629

The invention provides a method by which a component can be produced which is provided with a metallic coating which adheres well and which provides protection against corrosion. For this purpose, a flat steel product produced from a steel material containing 0.3 - 3 wt.-% manganese and having a yield point of 150 - 1100 MPa and a tensile strength of 300 - 1200 MPa is coated with an anti-corrosion coating which comprises a coating of ZnNi alloy which is electrolytically deposited on the flat steel product, which coating is composed in a single phase of .gamma.-ZnNi phase and which contains, as well as zinc and unavoidable impurities, 7 - 15 wt.-% nickel. A blank is then obtained from the flat steel product and is directly heated to at least 800°C and is then formed into the steel component, or is first formed into the steel component, which is then heated to at least 800°C. The steel component obtained in the respective cases is finally hardened by being cooled sufficiently fast from a sufficiently high temperature.

La présente invention concerne un procédé permettant de fabriquer un élément de construction garni d'un dépôt métallique tenant bien et protégeant contre la corrosion. À cet effet, on prend un produit plat réalisé dans un acier contenant de 0,3% à 3% en poids de manganèse, et présentant une limite apparente d'élasticité de 150 à 1100 MPa, ainsi qu'une ténacité de 300 à 1200 MPa, et on le garnit d'une couche de dépôt anticorrosion obtenue par dépôt électrolytique sur le produit plat d'une couche de dépôt d'alliage ZnNi monophase constitué d'une phase ?-ZnNi et contenant, outre le zinc et les impuretés résiduelles, 1% à 15% en poids de nickel. À partir de ce produit plat, on réalise un flan, soit que l'on porte directement à une température d'au moins 800°C, puis auquel on donne la forme de l'élément de construction, soit auquel on commence par donner la forme de l'élément de construction avant de le porter directement à une température d'au moins 800°C. On conclut par une trempe de l'élément de construction consistant à le refroidir suffisamment rapidement à partir d'une température suffisamment élevée.

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