FERRITIC STAINLESS STEEL

摘要

A ferritic stainless steel having excellent thermal fatigue resistance, excellent oxidation resistance, and excellent high-temperature fatigue resistance is provided. The ferritic stainless steel contains, in terms of % by mass, C: 0.020% or less, Si: 3.0% or less, Mn: 2.0% or less, P: 0.040% or less, S: 0.030% or less, Cr: 10.0% to 20.0%, N: 0.020% or less, Nb: 0.005% to 0.15%, Al: 0.20% to 3.0%, Ti: 5× (C+N)% to 0.50%, Cu: 0.55% to 1.60%, B: 0.0002% to 0.0050%, Ni: 0.05% to 1.0%, 0: 0.0030% or less, and the balance being Fe and unavoidable impurities. Additionally, the ferritic stainless steel satisfies that Al/O≧100.

主权项

1. A ferritic stainless steel comprising, in terms of % by mass, comprising:
C: 0.020% or less, by mass %; Si: 3.0% or less, by mass %: Mn: 2.0% or less, by mass %; P: 0.040% or less, by mass %; S: 0.030% or less, by mass %; Cr: 10.0% to 20.0%, by mass %: N: 0.020% or less, by mass %: Nb: 0.005% to 0.15%, by mass %; Al: 0.20% to 3.0%, by mass %; Ti: 5× (C+N)% to 0.50%, by mass %,
where in 5× (C+N), C and N respectively represent a carbon content and a nitrogen content (by mass %); Cu: 0.55% to 1.60%, by mass %; B: 0.0002% to 0.0050%, by mass %; Ni: 0.05% to 1.0%, by mass %; 0: 0.0030% or less, by mass %; and the balance being Fe and unavoidable impurities, wherein Al/O≧100,
where in Al/O, Al and O respectively represent an aluminum content and an oxygen content (by mass %).