Title:
WELDED RAIL
Document Type and Number:
WIPO Patent Application WO/2023/080135
Kind Code:
A1
Abstract:
A welded rail according to an embodiment of the present invention, which has excellent fatigue damage resistance and breakage resistance at a weld joint part, comprises multiple rail parts and a weld joint part where the rail parts are joined together. When the gap between a softest part and a weld center of a heat-affected zone (HAZ) having a width (W) of 60 mm or less as measured along a longitudinal direction is defined as WX, and a region located at a distance of 0.6 WX to 0.7 WX from the weld center and at a depth of 2 to 5 mm from a top outer shell surface is defined as a pro-eutectoid cementite structure evaluation region, the total crossing number (N) of pro-eutectoid cementite structures intersecting with crosslines constituted by two 100 µm-long line segments, which are respectively parallel to the longitudinal direction and to the vertical direction, is 26 or less in the pro-eutectoid cementite structure evaluation region.
Inventors:
UEDA MASAHARU (JP)
SAITA KENJI (JP)
MIYAZAKI TERUHISA (JP)
TANAHASHI TAKUYA (JP)
SAITA KENJI (JP)
MIYAZAKI TERUHISA (JP)
TANAHASHI TAKUYA (JP)
Application Number:
PCT/JP2022/040876
Publication Date:
May 11, 2023
Filing Date:
November 01, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/58; B23K11/04; C21D8/00; C21D9/04; C21D9/50
Domestic Patent References:
| WO2013161026A1 | 2013-10-31 | |||
| WO2022071007A1 | 2022-04-07 |
Foreign References:
| JP2004043862A | 2004-02-12 | |||
| JP2004043863A | 2004-02-12 | |||
| JP2012101280A | 2012-05-31 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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