The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2017
Filed:
Mar. 28, 2012
Applicants:
Nobuhiko Hiraide, Shunan, JP;
Fumio Fudanoki, Nagoya, JP;
Shunji Sakamoto, Kitakyushu, JP;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22C 38/54 (2006.01); F28F 19/02 (2006.01); C22C 38/48 (2006.01); C22C 38/42 (2006.01); C22C 38/32 (2006.01); C22C 38/30 (2006.01); C22C 38/28 (2006.01); C22C 38/26 (2006.01); C22C 38/24 (2006.01); C22C 38/22 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); F28F 21/08 (2006.01); F28D 21/00 (2006.01); F02M 37/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/54 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/48 (2013.01); F28D 21/0003 (2013.01); F28F 19/02 (2013.01); F28F 21/083 (2013.01); C21D 2211/005 (2013.01); F02M 37/0011 (2013.01);
Abstract
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,8(C+N)+0.03≦Nb+Ti≦0.6  (1)Si+Cr+Al+{Nb+Ti−8(C+N)}≧15.5  (2).