| 摘要 |
PURPOSE: A high strength steel sheet having excellent elongation and a method for manufacturing the same are provided to obtain the balance of tensile strength and elongation(TS×El) of 20000MPa% or more by controlling components and manufacturing conditions. CONSTITUTION: A high strength steel sheet having excellent elongation comprises 0.07-0.2wt.% of C, 2.0wt.%(0 is exclusive) or less of SI, 3.0-7.0wt.% of Mn, 0.03wt.% or less(0 is exclusive) of P, 0.015wt.% or less(0 is exclusive) of S, 1.3-3.0wt.% of AI, 0.02 wt.% or less(0 is exclusive) of N, and the remaining amount of Fe and inevitable impurities. The steel sheet has a microstructure comprising 10-40 area% of austenite and the remaining amount of ferrite. |
