| 简介 |
PROBLEM TO BE SOLVED : To provide a cold-rolled steel sheet having excellent shape fixability and aging resistance without using rare metals, and to provide a method for manufacturing the same.
SOLUTION : The cold-rolled steel sheet having excellent shape fixability and aging resistance has a chemical composition including, by mass, 0.0030% or less of C, 0.05% or less of Si, 0.30% or less of Mn, 0.05% or less of P, 0.03% or less of S, 0.01-0.10% of Al, and 0.0030% or less of N, and the balance Fe with inevitable impurities, and satisfies [Mn]×[C]≤4.0×10-4, wherein [M] represents the content (mass%) of an element M. Further, the steel sheet is characterized in that the aging index AI is 20 MPa or less and the yield strength YP after aging for 6 months at 25°C is 180 MPa or less.
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