Steel Sheet And Manufacturing Method Thereof

Abstract: A steel sheet according to the present invention comprises, in weight%: 0.008-0.015% of C, 0.200% or less of Si; 1.30-2.00% of Mn; 0.5-1.0% of Cr; 0.030% or less of P; 0.010% or less of S; 0.0020-0.0080% of N; and 0.010-0.060% of Al, the remainder being Fe and inevitable impurities, wherein the value of K defined in relational expression 1 is 0 to 15.000, and the microstructure may include, by area%, 0.30-0.80% of a transformed structure, the remainder being ferrite. [Relational expression 1] K = - 651[C] - 2.42[Mn] + 25.7[Cr] - 220[N] (In the formula, [C], [Mn], [Cr] and [N] are the weight% of the respective elements.)

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