C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/04 (2006.01) C22C 38/02 (2006.01)
Patent
CA 2744992
A pearlite rail contains, by mass%, 0.65 to 1.20% of C; 0.05 to 2.00% of Si; 0.05 to 2.00% of Mn; and the balance composed of Fe and inevitable impurities, wherein at least part of the head portion and at least part of the bottom portion has a pearlite structure, and the surface hardness of a portion of the pearlite structure is in a range of Hv320 to Hv500 and a maximum surface roughness of a portion of the pearlite structure is less than or equal to 180 µm.
L'invention concerne un rail en perlite contenant, en masse: 0,65-1,20 % de carbone, 0,05-2,00 % de silicium, et 0,05-2,00 % de manganèse, le reste sous forme de fer et d'impuretés inévitables. Au moins une partie de la tête et au moins une partie de la base de ce rail sont en perlite. Les parties susmentionnées en perlite ont une dureté superficielle comprise entre 320 et 500 HV et une rugosité superficielle maximale de 180 µm tout au plus.
Katsuya Iwano
Kyohei Sonoyama
Masaharu Ueda
Takuya Tanahashi
Teruhisa Miyazaki
Goudreau Gage Dubuc
Nippon Steel Corporation
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