| abstract |
Provided are a ferritic stainless steel sheet with good surface quality and for which discoloration due to heating can be prevented, and a manufacturing method therefor. The present invention is a ferritic stainless steel sheet that is temper-rolled after bright annealing and has a passivation film. The area ratio of micro-defects with areas of at least 10 µm 2 in the steel sheet surface is 0.2%-1.5%. The thickness of the passivation film is 1 nm-10 nm. The average Si concentration in the passivation film is 10 at%-20 at%. The ratio of average Si, Al, Cr and Fe concentrations in the components of the passivation film is (Si+Al+Cr)/Fe>1.0. When producing said ferritic stainless steel sheet, a hot-rolled acid-washed material is used as starting material. The steel sheet surface is polished at least one time in a previous step by finish cold-rolling after which annealing is performed. After said annealing, finish cold-rolling, bright annealing and temper-rolling are performed in order. |