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Title:
PEARLITE-BASED RAIL HAVING EXCELLENT WEAR RESISTANCE AND DUCTILITY
Document Type and Number:
Japanese Patent JP2010018844
Kind Code:
A
Abstract:

To improve the service life of a rail used for a heavy-load railroad by compositely adding Co and Ni as the components of a rail steel, and controlling an Ni/Co ratio to a fixed range, so as to improve the wear resistance and ductility of a pearlite texture, and controlling the texture and hardness, so as to improve the wear resistance and ductility of a pearlite texture.

The pearlite-based rail having excellent wear resistance and ductility is characterized in that, in a steel rail comprising, by mass, 0.65 to 1.20% C, 0.05 to 2.00% Si, 0.05 to 2.00% Mn, 0.05 to 0.50% Co, 0.10 to 2.25% Ni and the balance Fe with inevitable impurities, the ratio of the Co content to the Ni content (Ni/Co) lies in the range of 2.0 to 4.5, and at least a part of the head surface part of the steel rail has a pearlite texture.


Inventors:
UEDA MASAHARU
YAMAMOTO TAKESHI
ONODERA NORIAKI
FURUTA HITOSHI
Application Number:
JP2008180444A
Publication Date:
January 28, 2010
Filing Date:
July 10, 2008
Export Citation:
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Assignee:
NIPPON STEEL CORP
International Classes:
C22C38/00; C22C38/10; C22C38/54; E01B5/02
Domestic Patent References:
JP2005163086A2005-06-23
JP2005256023A2005-09-22
JP2004204306A2004-07-22
JP2005290544A2005-10-20
JP2005171326A2005-06-30
JP2002030341A2002-01-31
Attorney, Agent or Firm:
柳瀬 睦肇
宇都宮 正明
渡部 温