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:
May. 13, 2014
Filed:
Dec. 07, 2009
Masaharu Hatano, Tokyo, JP;
Akihiko Takahashi, Tokyo, JP;
Eiichiro Ishimaru, Tokyo, JP;
Shigenori Takahata, Tokyo, JP;
Masaharu Hatano, Tokyo, JP;
Akihiko Takahashi, Tokyo, JP;
Eiichiro Ishimaru, Tokyo, JP;
Shigenori Takahata, Tokyo, JP;
Abstract
The present invention provides a ferritic stainless steel comprised of, by mass %, C: 0.001 to 0.02%, Si: 0.01 to 0.6%, Mn: 0.01 to 0.6%, P: 0.005 to 0.04%, S: 0.0001 to 0.01%, Cr: 13 to 22%, N: 0.001 to 0.02%, Al: 0.005 to 0.05%, Sn: 0.001 to 1%, and a balance of Fe and unavoidable impurities, which steel satisfies the following formulae: 0<I(Fe)/I(Cr)<5 and 0<I(O)/I(Sn)<3, where I(Fe), I(Cr), I(Sn), and I(O) are the X-ray intensities of the Fe oxides, Cr oxides, Sn oxides, and the sum of X-ray intensities other detected oxides at the steel surface measured by an X-ray photoelectron spectrometer. The present invention also provides a method of producing the ferritic stainless steel.