Patent ID: 6193819
Filing Date: 2001-02-27
Classification: C21D,H01J

Abstract:
A method for manufacturing a cold rolled shadow mask steel sheet, comprising the steps of:preparing a steel composed of, in weight %, 0.003% or less of C, 0. 10-0.20% of Mn, 0.01-0.05% of Al, 0.004% or less of N, and a balance of Fe and other unavoidable impurities;hot rolling the steel at a temperature of above 910.degree. C., and then cold rolling the steel to form a cold rolled steel sheet;decarburization annealing said cold rolled steel sheet down to a carbon content of 0.001 5% or less to form a decarburized steel sheet at a temperature of 800-860.degree. C. for 1-5 minutes; andcold rolling said decarburized steel sheet with a reduction ratio of more than 35% to provide a finished cold rolled steel sheet having a minimum tensile strength of 540 MPa.