Ferritic stainless steel for biofuel supply system part, biofuel supply system part, ferritic stainless steel for exhaust heat recovery unit, and exhaust heat recovery unit

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United States of America Patent

PATENT NO 9611525
APP PUB NO 20140069619A1
SERIAL NO

14007807

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Abstract

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An aspect of a ferritic stainless steel contains, by mass %: C: 0.03% or less; N: 0.03% or less; Si: more than 0.1% to 1% or less; Mn: 0.02% to 1.2%; Cr: 15% to 23%; Al: 0.002% to 0.5%; and either one or both of Nb and Ti, with the remainder being Fe and unavoidable impurities, wherein Expression (1) and Expression (2) illustrated below are satisfied, an oxide film is formed on a surface thereof, and the oxide film contains Cr, Si, Nb, Ti and Al in a total cationic fraction of 30% or more,

description='In-line Formulae' end='lead'8(C+N)+0.03≦Nb+Ti≦0.6  (1)description='In-line Formulae' end='tail'

description='In-line Formulae' end='lead'Si+Cr+Al+{Nb+Ti−8(C+N)}≧15.5  (2).description='In-line Formulae' end='tail'

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL STAINLESS STEEL CORPORATION8-2 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 1000005

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fudanoki, Fumio Nagoya, JP 11 62
Hiraide, Nobuhiko Shunan, JP 21 89
Sakamoto, Shunji Kitakyushu, JP 44 580

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