Magnetic shield material, production method thereof and...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/12 (2006.01) C22C 38/02 (2006.01) C25D 5/26 (2006.01) H01J 29/06 (2006.01) H01J 31/20 (2006.01)

Patent

CA 2232439

A magnetic shield material which provides good internal magnetic shielding and high handling strength for use in a color image tube, its production method and a color image tube having the material assembled therein. The magnetic shield material is produced by cold rolling a hot-rolled low-carbon steel strip consisting of less than 0.006 wt.% C, less than 0.002 wt.% N, less than 0.5 wt.% Mn, 0.5 to 2.5 wt.% Si and the balance of Fe and unavoidable impurities, annealing the steel and applying nickel plating.

Cette invention se rapporte à un matériau de blindage magnétique, qui fournit une bonne protection magnétique interne et une bonne résistance aux manipulations, à utiliser dans un tube image couleur, à son procédé de production et à un tube image couleur dans lequel est incorporé ce matériau. On produit ce matériau de blindage magnétique en laminant à froid une bande d'acier à faible teneur en carbone laminée à chaud, comprenant moins de 0,006 % en poids de C, moins de 0,002 % en poids de N, moins de 0,5 % en poids de Mn, 0,5 à 2,5 % en poids de Si et le reste de Fe et des impuretés inévitables, en procédant au recuit de cet acier et en appliquant un placage au nickel.

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