| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cold rolled steel sheet having excellent bending workability, which can obtain satisfactory formability in actual press forming. <P>SOLUTION: The cold rolled steel sheet has a composition including, by mass%, ≤0.005% C, ≤0.1% Si, ≤0.5% Mn, ≤0.03% P, ≤0.02% S, ≤0.005% N and ≤0.1% Al, and further including 0.020 to 0.1% Ti, and the balance Fe with inevitable impurities. Further, the size of TiN is controlled to ≤0.5 micron, the size of Ti sulfide and/or Ti carbosulfide is controlled to ≤0.5 micron and ferrite grain size is controlled to ≤30 micron, and further, the X-ray random intensity ratio of the (111)//Nd is controlled to ≥3 and the X-ray random intensity ratio of the (100)//Nd is controlled to ≤1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
