Patent ID: 6777863
Filing Date: 2004-08-17
Classification: C21D,C22C,H01J

Abstract:
A method of producing a material for an aperture grille for use in a color picture tube, comprisingproviding a low carbon steel sheet consisting of Fe, C, wherein said C is present in an amount no greater than 0.01 wt %, up to 0.5 wt % Mn, up to 0.3 wt % Si, up to 0.01 wt % S and N, 9 to 30 wt % of Ni and 0.1 to 5 wt % of Co; cold-rolling the low carbon steel sheet at a reduction rate of not less than 60%; and annealing the low carbon steel sheet at a temperature of 400 to 500Â° C.