| 摘要 |
PROBLEM TO BE SOLVED: To provide a cold rolled steel sheet, an electrogalvanized cold rolled steel sheet, a hot-dip galvanized cold rolled steel sheet and a galvannealed cold rolled steel sheet having excellent deep drawability, and a method for manufacturing them.SOLUTION: A cold rolled steel sheet contains, in mass%, C:0.0005-0.0045%, Si:1.0% or less, Mn:0.10-1.6%, P:0.01-0.15%, S:0.010% or less, Al:0.10% or less, N:0.006% or less, Ti:0.002-0.150% and B:0.0002-0.0010% so as to satisfy the formula: {0.2<(Mn(mass%)-Mn*(mass%))/(B(ppm)-B*(ppm))≤0.5}. In a 1/4 thick position in the cold rolled steel sheet, a random intensity ratio (A) of a {332}<110> orientation is greater than 3.0, both a random intensity ratio (B) of a {557}<9 16 5> orientation and a random intensity ratio (C) of a {111}<112> orientation are 7 or more, and they satisfy the formula: {2.0≤(B)/(A)<5.0}. |
