| 摘要 |
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 1.91×10 4 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) T: Temperature (°C), t: time (h) |
