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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.:

US 12377888 B1

PDFFull Text
Date of Patent:
Aug. 05, 2025

Filed:

Sep. 28, 2021

Railway axle

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Taizo Makino, Tokyo, JP;

Chihiro Kozuka, Tokyo, JP;

Yuichiro Yamamoto, Tokyo, JP;

Toshiyuki Hata, Tokyo, JP;

Akihito Yamane, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Greer Burns & Crain Ltd.

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C22C 38/44 (2006.01); B60B 35/04 (2006.01); B60B 35/08 (2006.01); B60B 37/06 (2006.01); B61F 15/20 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); B60B 17/00 (2006.01); C21D 1/10 (2006.01); C21D 1/22 (2006.01); C21D 1/25 (2006.01); C21D 1/60 (2006.01); C21D 7/13 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C21D 9/28 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/46 (2006.01);
U.S. Cl.
CPC ...
B61F 15/20 (2013.01); B60B 35/04 (2013.01); B60B 35/08 (2013.01); B60B 37/06 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); B60B 17/00 (2013.01); B60Y 2200/30 (2013.01); C21D 1/10 (2013.01); C21D 1/22 (2013.01); C21D 1/25 (2013.01); C21D 1/60 (2013.01); C21D 7/13 (2013.01); C21D 8/005 (2013.01); C21D 9/0075 (2013.01); C21D 9/28 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01);
Abstract

The railway axle according to this disclosure has a pair of fitting portions and which each include a fitting portion hardened layer and a base metal portion, and a center parallel portion which includes a center parallel portion hardened layer and the base metal portion. The base metal portion has the chemical composition described in the description. In a region having the Vickers hardness of 480 HV or more in the center parallel portion hardened layer, a dislocation density ρ obtained based on a CoKα characteristic X-ray diffraction result is 2.5×10mor less, a half-value width B of the (211) diffraction plane is 1.34 degrees or less, and the dislocation density ρ and the half-value width B of the (211) plane obtained by X-ray diffraction satisfy Formula (1).(−4.8×10+8.5×10)/ρ≥1.00  (1)

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