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:
Nov. 18, 2011
Minoru Honjo, Kurashiki, JP;
Tatsumi Kimura, Kurashiki, JP;
Shinichi Suzuki, Kawasaki, JP;
Nobuo Shikanai, Kurashiki, JP;
Minoru Honjo, Kurashiki, JP;
Tatsumi Kimura, Kurashiki, JP;
Shinichi Suzuki, Kawasaki, JP;
Nobuo Shikanai, Kurashiki, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A steel rail including a composition of, in mass percent, C of 0.6% to 1.0%, Si of 0.1% to 1.5%, Mn of 0.4% to 2.0%, P of 0.035% or less, S of 0.010% or less, Ca of 0.0010% to 0.010%, and the remainder being Fe and inevitable impurities, wherein the tensile strength is 1200 MPa or more, and the size of a long side of a C type inclusion is 50 μm or less in at least a cross-section in a longitudinal direction of a rail head, and the number of Ca type inclusions, each having a size of a long side of 1 μm to 50 μm, is 0.2 to 10 per observed area of 1 mmin the cross-section in the longitudinal direction of the rail head.