A method for the production of steel strip material for use in the manufacture of a perforated mask a braun's color television roehre

摘要

PURPOSE:To eliminate the annealing of shadow mask material prior to pressing, by performing cold rolling on low carbon steel with specific pressure rate then annealing said band steel in the state of tight coil with specific temperature. CONSTITUTION:Cold rolling is performed with pressure rate of 10-35% on low carbon steel to produce steel plate having depth thinner than 0.2mm, then siad cold rolled steel band is annealed in the state of tight coil under the temperature of 520-600 deg.C and applied with conditioning rolling to obtain a shadow mask material, thereafter passed through etching process, leveller process, press process to produce a shadow mask. Since pre-annealing required for conventional Braun tube maker is eliminated by high efficient, low cost annealing at material maker, the work efficiency is improved while defective product is considerably reduced.