| 摘要 |
PURPOSE: Provided is a method for manufacturing cold rolled steel sheets for shadow mask which has superior etching property and shape uniformity even without decarburization process. CONSTITUTION: The cold rolled steel sheet having superior etching property and shape uniformity is manufactured by heat treating a super low carbon Al-killed steel slab comprising C 0.005wt.% or less, Mn 0.1-0.4wt.% or less, P 0.03wt.% or less, S 0.015wt.% or less, sol-Al 0.06wt.% or less, N 0.004wt.% or less, Cr 0.02-0.04wt.% or less, Ti 0.03-0.05wt.% or less, a balance of Fe, and other inevitable impurities in the temperature range of 1200 to 1250deg.C; finish rolling at over Ar3 transformation point; coiling it in the temperature range of 640 to 680deg.C; cold rolling the steel sheet to final thickness at a reduction rate of 85% or higher; continuous annealing within the temperature range of 640 to 680deg.C; and then carrying out conventional skin-pass.
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