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:
Jun. 07, 2011
Filed:
Mar. 25, 2008
Minoru Honjo, Tokyo, JP;
Tatsumi Kimura, Tokyo, JP;
Shinichi Suzuki, Tokyo, JP;
Kimihiro Nishimura, Tokyo, JP;
Shinji Mitao, Tokyo, JP;
Nobuo Shikanai, Tokyo, JP;
Minoru Honjo, Tokyo, JP;
Tatsumi Kimura, Tokyo, JP;
Shinichi Suzuki, Tokyo, JP;
Kimihiro Nishimura, Tokyo, JP;
Shinji Mitao, Tokyo, JP;
Nobuo Shikanai, Tokyo, JP;
JFE Steel Corporation, , JP;
Abstract
An internal high hardness type pearlitic rail that has a composition containing 0.73% to 0.85% by mass C, 0.5% to 0.75% by mass Si, 0.3% to 1.0% by mass Mn, 0.035% by mass or less P, 0.0005% to 0.012% by mass S, 0.2% to 1.3% by mass Cr, and the balance being Fe and incidental impurities, in which the value of [% Mn]/[% Cr] is greater than or equal to 0.3 and less than 1.0, where [% Mn] represents the Mn content, and [% Cr] represents the Cr content, and in which the internal hardness of a rail head that is defined by the Vickers hardness of a portion located from a surface layer of the rail head to a depth of at least 25 mm is greater than or equal to 380 Hv and less than 480 Hv.