Pohang Iron & Steel Co. Ltd.

Ohjoon Kwon

Eel-Young Kim

Ki-Ho Kim

Gyosung Kim

Young-Mo Kim

Jong-Ho Kim

Joung-Hoon Cheoi

Hyun-Gyu Hwang

A method for manufacturing a cold rolled steel sheet for use in a shadow mask is disclosed, in which without adding an expensive alloy element, a short intermediate decarburization annealing is carried out, and despite this fact, a forming defect does not occur after the forthcoming stacked annealing. The method includes 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. A hot rolling is carried out on the steel at a temperature of above 910&deg; C., and then, a first cold rolling is carried out to form a first cold rolled steel sheet. Then a decarburization is carried out on the first cold rolled steel sheet down to a carbon content of 0.0015% to form a decarburized steel sheet, and then a second cold rolling with a reduction ratio of more than 35% is carried out on the decarburized steel sheet.

Method for manufacturing cold rolled shadow mask steel sheet with stacked annealing

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Pohang-si, South Korea

Ohjoon Kwon