Method and plant for the manufacture of a deep-drawing steel...

B - Operations – Transporting – 21 – B

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B21B 1/46 (2006.01) B21B 1/28 (2006.01) C21D 8/04 (2006.01) B21B 45/00 (2006.01)

Patent

CA 2225743

In the manufacture of steel strip or sheet, suitable for use as deep-drawing steel for the manufacture of can bodies by deep-drawing and ironing, there are performed the steps of (i) providing a low-carbon steel in the form of a slab, (ii) rolling the slab in the austenitic region to reduce its thickness to a transfer thickness, (iii) cooling the rolled slab having the transfer thickness into the ferritic region, (iv) rolling the rolled slab in the ferritic region to a finished thickness. To provide a steel having reduced tendency to "earing" in can body manufacture, the transfer thickness is less than 1.8 mm and the total thickness reduction in the ferritic region from the transfer thickness to the finished thickness is less than 90 %.

Cette invention concerne un procédé de fabrication d'une bande ou d'une feuille d'acier pouvant être utilisée comme acier d'emboutissage profond dans la fabrication de corps de boîtes de conserve par emboutissage profond et par étirage sur mandrin, lequel procédé comprend les étapes suivantes: (i) mettre de l'acier à faible teneur en carbone sous forme d'une brame; (ii) laminer cette brame dans la zone austénitique afin de réduire son épaisseur à une épaisseur de transfert; (iii) refroidir dans la zone ferritique la brame laminée ayant une épaisseur de transfert; (iv) laminer dans la zone ferritique la brame laminée afin d'obtenir une épaisseur finale. Afin d'obtenir un acier ayant une tendance réduite à la formation de cornes lors de la fabrication de corps de boîtes de conserve, on fait en sorte que l'épaisseur de transfert soit inférieure à 1,8 mm et que la diminution totale depuis l'épaisseur de transfert à l'épaisseur finale dans la zone ferritique soit inférieure à 90 %.

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