Stainless steel strip or stainless steel foil and method of making same

The invention provides a stainless steel band or stainless steel foil with high corrosion resistance and a manufacturing method thereof. According to the present invention, the alloy elements, such asNb, V and N, etc., can be not added, and the stainless steel band or stainless steel foil has a fine grain structure having an average grain diameter of 1.0 [mu] m or less which is suitable for precision pressing or precision machining. More specifically, the present invention relates to a metastable austenite-based stainless steel strip or stainless steel foil and the manufacturing method thereof. In the etching through processing, the metastable austenite-based stainless steel strip or stainless steel foil has an ultra-fine grain structure suitable for medical equipment applications while satisfying end surface perpendicularity and surface roughness. The metastable austenite-based stainless steel strip or stainless steel foil comprises, in mass% of 0.01 to 0.20% of C; 0.1 to 2.0% of Si;0.1 to 3.0% of Mn; 0.05%