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Abstract

The present invention provides a Sn-containing ferritic stainless steel sheet having excellent heat resistance. The ferritic stainless steel contains, in terms of mass %, 0.015% or less of C, 1.5% or less of Si, 1.5% or less of Mn, 0.035% or less of P, 0.015% or less of S, 13-21% of Cr, 0.01-0.50% of Sn, 0.05-0.60% of Nb and 0.020% or less of N, with the remainder consisting of Fe and unavoidable impurities. The ferritic stainless steel satisfies formula 1 and formula 2, and has a grain boundary Sn concentration of 2 atom % or less when subjected to a heat treatment at 600-750° C. in which the value of L, as shown in formula 3, is 1.91×10⁴ or higher. 8≦CI=(Ti+0.52Nb)/(C+N)≦26 (formula 1) GBSV=Sn+Ti−2Nb−0.3Mo−0.2≦0 (formula 2) L=(273+T)(log(t)+20) (formula 3) I: Temperature (° C.), t: time (h)

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First Claim