| 摘要 |
<p>A bake-hardenable cold rolled steel sheet with high strength and superior aging resistance used for outer panels of an automobile body, a galvannealed steel sheet using the cold-rolled steel sheet, and a method for manufacturing the cold-rolled steel sheet are disclosed. The steel sheet comprises, by weight %, C: 0.0016~0.0025%, Si: 0.02% or less, Mn: 0.2~1.2%, P: 0.05~0.11%, S: 0.01% or less, Sol. Al: 0.08~0.12%, N: 0.0025% or less, Ti: 0~0.003%, Nb: 0.003~0.011%, Mo: 0.01~0.1%, B: 0.0005~0.0015%, the balance of Fe and other unavoidable impurities. The steel sheet has superior bake hardenability, aging resistance at room temperature, and secondary work embrittlement resistance.</p> |
