Title:
スチール製レールの熱処理方法およびそれに用いる熱処理装置
Document Type and Number:
Japanese Patent JP4906651
Kind Code:
B2
Abstract:
The present invention discloses a heat treatment method of steel rail, comprising the steps of: (1) keeping the rolled hot steel rail running continuously, and performing hot straightening process for it; (2) performing first heat treatment process for the rolled hot steel rail after the hot straightening process, i.e., forced cooling the rail head and the rail base of the steel rail, e.l. jet air cooling, and (3) performing second heat treatment process for the steel rail after the first heat treatment process, i.e., heating the rail head of the steel rail to a temperature of 850~950°C, and then forced cooling the rail head of the steel rail, e.l. jet air cooling, to a temperature that is close to the temperature of the rail base of the steel rail. Since the steel rail experiences second heat treatment process by reheating after it is heat treated using the residual heat of rolling, phase transition occurs in the steel rail in the two rapid cooling processes, and finer metallographic pearlitic structure is obtained in the steel rail. When the steel rail experiences the second heat treatment process, the rail web and the middle part of the rail head have already been at high temperature, therefore the energy consumption in reheating is reduced. The present invention also discloses a heat treatment apparatus of steel rail using the above method.
Inventors:
Gin loan shan
Application Number:
JP2007236429A
Publication Date:
March 28, 2012
Filing Date:
September 12, 2007
Export Citation:
Assignee:
Jinhua Flower Steel (Group) Ltd.
International Classes:
C21D9/04; C21D1/00; C21D1/42; C22C38/00; C22C38/04; C22C38/12
Domestic Patent References:
| JP63128123A | ||||
| JP2003160813A | ||||
| JP9248625A | ||||
| JP2005504174A | ||||
| JP2004076112A | ||||
| JP1246323A | ||||
| JP63277721A | ||||
| JP5033057A | ||||
| JP3166318A | ||||
| JP60103154A | ||||
| JP8252602A | ||||
| JP8295938A |
Foreign References:
| WO2002102537A1 |
Attorney, Agent or Firm:
Tamotsu Otani