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. 31, 2023
Filed:
Mar. 25, 2019
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Minoru Honjo, Tokyo, JP;
Mineyasu Takemasa, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/04 (2006.01); C21D 6/00 (2006.01); C21D 9/04 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); E01B 5/08 (2006.01);
U.S. Cl.
CPC ...
C22C 38/04 (2013.01); C21D 6/002 (2013.01); C21D 9/04 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); E01B 5/08 (2013.01); C21D 2211/009 (2013.01);
Abstract
Provided is a rail that is effective in improving wear resistance and rolling contact fatigue (RCF) resistance. The rail has a metallic structure including a pearlitic structure and a structure other than the pearlitic structure in a surface layer from a surface of a rail head to a depth of at least 0.5 mm, where the pearlitic structure has Vickers hardness of 420 HV or more and 520 HV or less, and the structure other than the pearlitic structure has Vickers hardness of 350 HV or more and 420 HV or less.