Method for coating a hot-rolled or cold-rolled steel flat...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 2/02 (2006.01)

Patent

CA 2712557

The invention relates to a method for coating a hot-rolled or cold-rolled steel flat product, containing 6 - 30 % wt. Mn, with a metallic protective layer by hot-dip coating in a melt bath. According to the invention, the coating outcome achieved with such a method with increased production reliability is optimised by the steel flat product being subjected to pickling treatment before entering the melt bath, in which pickling treatment the manganese oxide adhering to the steel flat product is essentially fully removed in a pickling bath.

La présente invention concerne un procédé pour appliquer une couche de protection métallique sur un produit plat en acier laminé à chaud ou à froid contenant 6 - 30% en poids de Mn, par immersion à chaud dans un bain en fusion. Selon l'invention, il est possible d'optimiser le résultat de revêtement obtenu en suivant un tel procédé, avec une sécurité de production accrue, grâce à un traitement de décapage du produit plat en acier avant l'entrée de celui-ci dans le bain en fusion, lequel traitement de décapage permet de retirer sensiblement complètement d'un bain en fusion l'oxyde de manganèse qui adhère au produit plat en acier.

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