HIGH-PURITY FERRITIC STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND WORKABILITY AND PROCESS F

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A high-purity ferritic stainless steel reduced in surface deterioration, which is attributable to corrosion such as pitting corrosion or rusting, to a level equivalent or superior to SUS304 without lowering the productivity or the workability or adding a rare earth element; and a process for the production of the steel, more specifically, a ferritic stainless steel which contains by mass C : 0.01% or less, Si : 0.01 to 0.20%, Mn : 0.01 to 0.30%, P : 0.04% or less, S : 0.01% or less, Cr : 13 to 22%, N : 0.001 to 0.020%, Ti : 0.05 to 0.35%, Al : 0.005 to 0.050%, and Sn : 0.001 to 1% with the balance being Fe and unavoidable impurities, wherein the passive film is modified by the addition of Sn, whereby the corrosion resistance is improved. To enhance the modification effect of the added Sn on the passive film, the final annealing is followed by retention within a temperature range of 200 to 700°C for at least one minute.