| 摘要 |
<p>A cold rolled steel sheet is provided that is excellent in planar anisotropy and cup formability by controlling a texture ratio of I(222)/I(110) components in low carbon aluminum-killed steel into which Cr is added, and a method for manufacturing the cold rolled steel sheet is provided. A method for manufacturing a cold rolled steel sheet having excellent planar anisotropy comprises: subjecting aluminum killed steel comprising, by weight percent, 0.02 to 0.06% of C, 0.2 to 0.6% of Mn, not more than 0.05% of Si, 0.01 to 0.04% of Cr, not more than 0.02% of S, 0.03 to 0.07% of Al, 0.003 to 0.005% of N and the balance of Fe and other unavoidable impurities to homogenization treatment in a single-phase region of austenite; hot-rolling the homogenized aluminum killed steel to a finish rolling temperature of Ar3 transformation temperature or more; coiling the hot rolled steel sheet at a temperature of 600 to 700 deg.C; cold-rolling the coiled steel sheet to a cold reduction ratio of 85 to 95%; and performing continuous annealing of the cold rolled steel sheet to a temperature range from a recrystallization temperature to a temperature of a single phase ferrite region to obtain an annealed steel sheet having 1.5 to 2.8 of a texture ratio of I(222)/I(110) components.</p> |
