Title:
PEALITE BASED RAIL EXCELLENT IN WEAR RESISTANCE AND DUCTILITY AND METHOD FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2003/085149
Kind Code:
A1
Abstract:
A perlite based steel rail excellent in wear resistance and ductility having a perlite structure containing 0.65 to 1.40 mass % of C, wherein in the head corner region thereof and in at least a part of the range from the surface of the top of the head region to a point of a depth of 10 mm, 200 or more of perlite blocks having a particle diameter of 1 to 15 μm are observed per 0.2 mm2 of a checked area; and a method for producing the perlite based steel rail which comprises, in the hot rolling thereof, performing a finish rolling comprising a surface temperature of 850 to 1000°C and a cross section reduction percentage in the last pass of 6 % or more, and then subjecting the head region of said rail to an accelerated cooling at a cooling rate of 1 to 30°C/sec from an austenitic temperature to at least 550°C.
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Inventors:
UEDA MASAHARU (JP)
MATSUSHITA KOICHIRO (JP)
FUJITA KAZUO (JP)
IWANO KATSUYA (JP)
UCHINO KOUICHI (JP)
MOROHOSHI TAKASHI (JP)
KOBAYASHI AKIRA (JP)
MATSUSHITA KOICHIRO (JP)
FUJITA KAZUO (JP)
IWANO KATSUYA (JP)
UCHINO KOUICHI (JP)
MOROHOSHI TAKASHI (JP)
KOBAYASHI AKIRA (JP)
Application Number:
PCT/JP2003/004364
Publication Date:
October 16, 2003
Filing Date:
April 04, 2003
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
UEDA MASAHARU (JP)
MATSUSHITA KOICHIRO (JP)
FUJITA KAZUO (JP)
IWANO KATSUYA (JP)
UCHINO KOUICHI (JP)
MOROHOSHI TAKASHI (JP)
KOBAYASHI AKIRA (JP)
UEDA MASAHARU (JP)
MATSUSHITA KOICHIRO (JP)
FUJITA KAZUO (JP)
IWANO KATSUYA (JP)
UCHINO KOUICHI (JP)
MOROHOSHI TAKASHI (JP)
KOBAYASHI AKIRA (JP)
International Classes:
C21D9/04; C22C38/00; C22C38/02; C22C38/04; C22C38/18; C21D8/00; (IPC1-7): C22C38/00; C22C38/04; C22C38/58; C21D8/00
Foreign References:
| JP2001234238A | 2001-08-28 | |||
| JP2000345296A | 2000-12-12 | |||
| JPH09137228A | 1997-05-27 | |||
| EP0685566A1 | 1995-12-06 | |||
| JP2003105499A | 2003-04-09 | |||
| JP2002212677A | 2002-07-31 | |||
| JP2002226915A | 2002-08-14 | |||
| JP2002226914A | 2002-08-14 |
Other References:
See also references of EP 1493831A4
Attorney, Agent or Firm:
Ishida, Takashi (ISHIDA & ASSOCIATES Toranomon 37 Mori
Bldg. 5-, Toranomon 3-chome Minato-ku Tokyo, JP)
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