C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/04 (2006.01) C21D 9/04 (2006.01) C22C 38/00 (2006.01) C22C 38/12 (2006.01) C22C 38/32 (2006.01)
Patent
CA 2190124
This invention provides a steel rail having wear resistance and internal breakage resistance required for a heavy load railway, containing, in terms of percent by weight, more than 0.85 to 1.20% of C, 0.10 to 1.00% of Si, 0.40 to 1.50% of Mn, 0.0005 to 0.0040% of B, at least one of 0.05 to 1.00% of Cr, 0.01 to 0.50% of Mo, 0.02 to 0.30% of V, 0.002 to 0.05% of Nb and 0.10 to 2.00% of Co, whenever necessary, being acceleratedly cooled at a cooling rate of 5 to 15°C/sec from an austenite zone temperature to 650 to 500°C, exhibiting a pearlite structure having a hardness of at least Hv 370 within the range from the surface of the rail head portion to a position having a depth of 20 mm from the head surface with this head surface being the start point, and the difference of the hardness within this range being not more than Hv 30.
L'invention concerne des rails présentant une bonne résistance à l'usure et aux défaillances internes, capables de supporter de fortes charges. La tête du rail contient, en poids, entre 0,85 et 1,20 % de C, entre 0,10 et 1,00 % de Si, entre 0,40 et 1,50 % de Mn, entre 0,0005 et 0,0040 % de B et, le cas échéant, soit entre 0,05 et 1,00 % de Cr, entre 0,01 et 0,50 % de Mo, entre 0,02 et 0,30 de V, entre 0,002 et 0,05 % de Nb ou 0,10 à 2,00 % de Co. La tête du rail est refroidie rapidement à raison de 5 à 15 DEG C par seconde et ramenée de la zone de température de l'austénite à une température comprise entre 650 et 500 DEG C. Sur une épaisseur d'au moins 20 millimètres à compter de la surface, le rail se compose d'une structure en perlite ayant une dureté d'au moins 370 Hv. Dans cette zone, la dureté ne doit pas varier de plus de 30 Hv.
Uchino Kouichi
Ueda Masaharu
Goudreau Gage Dubuc
Nippon Steel Corporation
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