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Title:
LONG RAIL AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
Japanese Patent JP2008274414
Kind Code:
A
Abstract:

To provide a method for manufacturing a long rail, improving the fatigue strength of a welded part in comparison with the conventional rail.

The method for manufacturing the long rail is provided with: a process for manufacturing the long rail by welding at least two pieces of rails; and a process so that a lamellar of 60% among a pearlite in the structure of less than 50 m from the surface at an end edge part is formed angle of 45 or lower to the surface by performing an ultrasonic peening treatment to the end edge part of a bead formed on the welded part of the long rail. In this way, the fatigue limit of the welded part in 2 million times for repeating loads can be made to higher than 30 MPa in comparison with non-treating material, in which the ultrasonic peening treatment is not applied.


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Inventors:
KARIMINE KENICHI
UEDA MASAHARU
Application Number:
JP2008078403A
Publication Date:
November 13, 2008
Filing Date:
March 25, 2008
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C21D7/06; B23K31/00; B23P9/04; E01B11/48; B23K101/26
Domestic Patent References:
JP2008544861A2008-12-11
JPH03249127A1991-11-07
JPS59106603A1984-06-20
JP2002180201A2002-06-26
JP2008274744A2008-11-13
JP2008274745A2008-11-13
JP2008274415A2008-11-13
JP2008544861A2008-12-11
JPH03249127A1991-11-07
JPS59106603A1984-06-20
JP2002180201A2002-06-26
JP2008274744A2008-11-13
JP2008274745A2008-11-13
JP2008274415A2008-11-13
Foreign References:
WO2007005080A22007-01-11
WO2007005080A22007-01-11
Attorney, Agent or Firm:
Mutsumi Yanase
Masaaki Utsunomiya
Atsushi Watanabe



 
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