C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/38 (2006.01) B21B 1/085 (2006.01) C21D 8/00 (2006.01) C21D 9/04 (2006.01) C22C 38/02 (2006.01) C22C 38/18 (2006.01)
Patent
CA 2749503
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 100°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.
Fujita Kazuo
Iwano Katsuya
Kobayashi Akira
Matsushita Koichiro
Morohoshi Takashi
Goudreau Gage Dubuc
Nippon Steel Corporation
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