Ferritic stainless steel sheet, and methods for producing ferritic stainless steel

There is provided: ferritic stainless steel having both electrical conductivity in the oxide film thereof and creep resistance strength, in a long-time high temperature oxidative environment; and a ferritic stainless steel sheet having both creep resistance strength and formability, in the same environment; wherein both of the steel and the steel sheet are provided without relying on addition of rare earth elements and alloy elements. The ferritic stainless steel is characterized by comprising 0.03% or less of C, 1% or less of Si, 1% or less of Mn, 0.045% or less of P, 0.003% or less of S, 20to 25% of Cr, 0.3 to 2% of Mo, 0.04% or less of N, 0.5% or less of Al, 0.2% or less of V, 0.001 to 0.5% of Nb, and/or 0.001 to 0.5% of Ti, on a mass% basis, with the balance being Fe and unavoidable impurities. 提供一种不依赖于稀土元素和合金元素的添加，在长期高温氧化环境下兼顾氧化皮膜的电传导性和耐蠕变强度的铁素体系不锈钢，以及兼顾耐蠕变强度和加工性的铁素体系不锈钢板。该铁素体系不锈钢的其特征在于，以质量％计，具有C：0.030％以下、Si：1.00％以下、Mn：1.00％以下、P：0.045％以下、S：0.0030％以下、Cr：20.0～25.0％、Mo：0.3～2.0％、N：0.040％以下、Al：0.50％以下、V：0.20％