Austenitic stainless steel and method for producing same

Disclosed are an austenitic stainless steel having excellent surface roughness and having no surface cracks in a bent portion thereof, and a method for manufacturing the same. The austenitic stainless steel according to one embodiment of the present invention may contain, in wt%, 0.005-0.03% of C, 0.1-1% of Si, 0.1-2% of Mn, 6-12% of Ni, 16-20% of Cr, 0.01-0.2% of N, 0.25% or less of Nb, and the balance Fe and unavoidable impurities, and may have an average grain size (d) value of 5 [mu] m or less in the thickness center portion, and the area fraction of martensite measured in a bent portion after a 180 DEG bending test may be 10% or less. 本发明公开了一种奥氏体系不锈钢及其制造方法，其中，所述奥氏体系不锈钢的弯曲部位没有表面裂纹，并且具有优异的表面粗糙度。根据本发明的一个实施方案的奥氏体系不锈钢中，以重量％计，可以包含：C：0.005-0.03％、Si：0.1-1％、Mn：0.1-2％、Ni：6-12％、Cr：16-20％、N：0.01-0.2％、Nb：0.25％以下、余量的Fe及不可避免的杂质，所述奥氏体系不锈钢的厚度中心部的平均晶粒尺寸(d)值可以为5μm以下，并且在180°弯曲实验后的弯曲部位中测量的马氏体的面积分数可以为10％以下。