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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 12747483 B1

PDFFull Text
Date of Patent:
Sep. 29, 2026

Filed:

Nov. 01, 2022

Welded rail

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Masaharu Ueda, Tokyo, JP;

Kenji Saita, Tokyo, JP;

Teruhisa Miyazaki, Tokyo, JP;

Takuya Tanahashi, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Rabin & Berdo, P.C.

Primary Examiner:

Zachary L Kuhfuss

Int. Cl.
CPC ...
C21D 9/04 (2006.01); B23K 11/04 (2006.01); B23K 13/00 (2006.01); C21D 9/50 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/30 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); C22C 38/40 (2006.01); C22C 38/58 (2006.01); E01B 11/44 (2006.01); E01B 29/42 (2006.01); B23K 101/26 (2006.01); C21D 8/00 (2006.01); E01B 11/50 (2006.01); E01B 29/44 (2006.01);
U.S. Cl.
CPC ...
C21D 9/04 (2013.01); B23K 11/04 (2013.01); B23K 13/00 (2013.01); C21D 9/50 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/30 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); C22C 38/40 (2013.01); C22C 38/58 (2013.01); E01B 11/44 (2013.01); E01B 29/42 (2013.01); B23K 2101/26 (2018.08); C21D 8/00 (2013.01); C21D 2211/009 (2013.01); E01B 11/50 (2013.01); E01B 29/44 (2013.01);
Abstract

A welded rail having excellent fatigue damage resistance and breakage resistance of a welded joint portion according to an aspect of the present invention includes: a plurality of rail portions; and a welded joint portion joining the rail portions, in which a HAZ width (W) is 60 mm or less, and when an interval between a most softened portion and a welding center measured along a longitudinal direction is defined as WX and a region where the distance from the welding center is 0.6 WX to 0.7 WX and the depth from a top portion outer surface is 2 to 5 mm is defined as a pro-eutectoid cementite structure evaluation region, in the pro-eutectoid cementite structure evaluation region, a total number of intersections (N) of a pro-eutectoid cementite structure intersecting a cross line including two line segments having a length of 100 μm parallel to the longitudinal direction and the vertical direction is 26 or less.

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