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:
Jan. 29, 2013
Filed:
Aug. 13, 2010
Masaharu Ueda, Tokyo, JP;
Kyohei Sonoyama, Tokyo, JP;
Takuya Tanahashi, Tokyo, JP;
Teruhisa Miyazaki, Tokyo, JP;
Katsuya Iwano, Tokyo, JP;
Masaharu Ueda, Tokyo, JP;
Kyohei Sonoyama, Tokyo, JP;
Takuya Tanahashi, Tokyo, JP;
Teruhisa Miyazaki, Tokyo, JP;
Katsuya Iwano, Tokyo, JP;
Nippon Steel Corporation, Tokyo, JP;
Abstract
A pearlite rail contains, by mass %, 0.65 to 1.20% of C; 0.05 to 2.00% of Si; 0.05 to 2.00% of Mn; and the balance composed of Fe and inevitable impurities, wherein at least part of the head portion and at least part of the bottom portion has a pearlite structure, and the surface hardness of a portion of the pearlite structure is in a range of Hv320 to Hv500 and a maximum surface roughness of a portion of the pearlite structure is less than or equal to 180 μm.