| 摘要 |
<p>Disclosed is a cold-rolled steel sheet having improved processability and improved hydrogen embrittlement resistance. The cold-rolled steel sheet comprises not less than 0.03% by mass and less than 0.30% by mass of C, 2.0% by mass or less (including 0% by mass) of Si, 0.1 to 2.8% by mass of Mn, 0.1% by mass or less of P, 0.005% by mass or less of S, 0.01% by mass or less of N, and 0.01 to 1.00% by mass of Al. In the cold-rolled steel sheet, the area ratio of tempered bainite is 50% or more (including 100%), the total area ratio of tempered martensite and remaining austenite is less than 3% (including 0%), and a structure comprising ferrite makes up the remainder. In the cold-rolled steel sheet, the distribution of precipitates in the tempered bainite and/or the distribution of cementite particles in the tempered bainite are controlled.</p> |
