Process of producing steel strips suitable for an...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 8/02 (2006.01) B21B 1/28 (2006.01) B21B 13/14 (2006.01)

Patent

CA 2636546

A process is described for producing steel strips suitable for receiving a surface coating which is resisting to oxidation, in particular tin plating, of medium productivity, that does not require for its execution plants extended of a large areas or involving high economical investments. It comprises, starting from pickled hot strips having a thickness > 0.7 mm, preferably obtained from thin-slab plants, a single cold rolling step by passing through not more than three stands of the Sendzimir 6Zhi type for the cold reduction of thickness to less than 0.25 mm and subsequent annealing. It is possible to obtain final thicknesses < 0.18 mm both by simple reduction, which only provides subsequent skin-passing and finishing steps, and by double reduction on half-raw strip, which provides subsequent passes for thickness reduction of 30%.

L'invention concerne un procédé de production de feuillards d'acier pouvant recevoir de manière appropriée un revêtement de surface résistant à l'oxydation, notamment un étamage, de productivité moyenne, dont l'exécution ne nécessite ni grandes installations occupant des surfaces étendues, ni grands investissements économiques. Le procédé consiste à: démarrer, avec des feuillards décapés à chaud dont l'épaisseur est supérieure à 0,7 mm, provenant de préférence d'installations de production de brames minces, par une étape unique de laminage à froid réalisée en trois passes au plus grâce à un procédé de type Sendzimir 6Zhi permettant de réduire à froid l'épaisseur à moins de 0,25 mm, suivi d'une recuisson. On peut ainsi obtenir des épaisseurs finales inférieures à 0,18 mm, aussi bien par simple réduction nécessitant uniquement des étapes subséquentes d'écrouissage et de finition, que par double réduction réalisée sur un feuillard semi-brut nécessitant des passes subséquentes destinées à réduire l'épaisseur de 30 %.

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