Ferrite-based stainless steel plate having excellent resistance against scale peeling, and method for manufacturing same
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United States of America Patent
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Feb 15, 2013
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Feb 15, 2012
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Abstract
This ferritic stainless steel sheet contains, by mass %: C: 0.02% or less, N: 0.02% or less, Si: 0.05% to 0.80%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Cr: 12% to 20%, Cu: 0.80% to 1.50%; Ni: 1.0% or less, Mo: 0.01% to 2.00%, Nb: 0.30% to 1.00%, Ti: 0.01% to less than 0.25%, Al: 0.003% to 0.46%, V: 0.01% to less than 0.15%, and B: 0.0002% to 0.0050%, with a remainder of Fe and inevitable impurities, wherein the following formulae (1) and (2) are satisfied, and an average Cu concentration in an area from a surface to a depth of 200 nm is 3.00% or less,
- in the case of Mn<0.65%,1.44×Si−Mn−0.05≥0 (1), andin the case of Mn≥0.65%,1.10×Si+Mn−1.19≥0 (2).
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