Title:
STEEL RAIL FOR HIGH SPEED AND QUASI-HIGH SPEED RAILWAYS AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2012/028111
Kind Code:
A8
Abstract:
Disclosed are a steel rail for high speed and quasi-high speed railways and the manufacturing method thereof. The steel rail with better rolling contact fatigue property can be obtained by reducing the percentage of carbon and using a technique of controlled cooling after rolling. The steel rail contains the following chemical compositions by weight: 0.40-0.64% of C; 0.10-1.00% of Si; 0.30-1.50% of Mn; less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.005% of Al; greater than 0 and less than or equal to 0.05% of a rare earth element; at least one of V, Cr, and Ti, having a total quantity of greater than 0 and less than or equal to 0.20%; and a remaining percentage of Fe and inevitable impurities. The steel rail manufactured according to the method in the present invention maintains the strength and hardness of the steel rail currently used in high speed railways while enhancing the tensile plasticity and yield strength. In addition, the energy value for the initiation and propagation of the fatigue micro crack on the surface of the steel rail is increased, thus improving the rolling contact fatigue property of the steel rail under the same condition. This prolongs the service life of the steel rail and enhances transportation safety.
Inventors:
MEI DONGSHENG (CN)
ZOU MING (CN)
HAN ZHENYU (CN)
XU QUAN (CN)
GUO HUA (CN)
DENG YONG (CN)
LI DADONG (CN)
TANG LI (CN)
ZHAO YUN (CN)
LIU JIANHUA (CN)
ZOU MING (CN)
HAN ZHENYU (CN)
XU QUAN (CN)
GUO HUA (CN)
DENG YONG (CN)
LI DADONG (CN)
TANG LI (CN)
ZHAO YUN (CN)
LIU JIANHUA (CN)
Application Number:
PCT/CN2011/079278
Publication Date:
July 12, 2012
Filing Date:
September 02, 2011
Export Citation:
Assignee:
PANGANG GROUP CO LTD (CN)
PANGANG GROUP PANZHIHUA STEEL (CN)
MEI DONGSHENG (CN)
ZOU MING (CN)
HAN ZHENYU (CN)
XU QUAN (CN)
GUO HUA (CN)
DENG YONG (CN)
LI DADONG (CN)
TANG LI (CN)
ZHAO YUN (CN)
LIU JIANHUA (CN)
PANGANG GROUP PANZHIHUA STEEL (CN)
MEI DONGSHENG (CN)
ZOU MING (CN)
HAN ZHENYU (CN)
XU QUAN (CN)
GUO HUA (CN)
DENG YONG (CN)
LI DADONG (CN)
TANG LI (CN)
ZHAO YUN (CN)
LIU JIANHUA (CN)
International Classes:
C22C38/14; C21D8/00; C22C38/18
Attorney, Agent or Firm:
MING & SURE INTELLECTUAL PROPERTY LAW FIRM (Haohai BuildingNo.7, 5th Street, Shangdi,Haidian District, Beijing 5, CN)
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