Internal high hardness type pearlitic rail with excellent...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/24 (2006.01) B21B 1/085 (2006.01) B21B 3/00 (2006.01) C21D 8/00 (2006.01) C21D 9/04 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) E01B 5/02 (2006.01)

Patent

CA 2687438

The invention provides a pearlite steel rail of high internal hardness type which is excellent in wear resistance, fatigue failure resistance, and delayed fracture resistance; and a process suitable for the production of the rail. Specifically, a pearlite steel rail which has a composition containing by mass C: 0.73 to 0.85%, Si: 0.5 to 0.75%, Mn: 0.3 to 1.0%, P: 0.035% or below, S: 0.0005 to 0.012%, Cr: 0.2 to 1.3%, V: 0.005 to 0.12%, and N: 0.0015 to 0.0060% with the balance consisting of Fe and unavoidable impurities and having a [%Mn]/[%Cr] ratio of 0.3 or above and below 1.0 (wherein [%Mn] is Mn content and [%Cr] is Cr content) and a [%V]/[%N] ratio of 8.0 to 30.0 (wherein [%V] is V content and [%N] is N content) and whose railhead exhibits an internal hardness of Hv380 or above and below Hv480 in terms of Vickers hardness (Hv) in a depth range of at least 25mm from the railhead surface.

L'invention porte sur un rail en acier perlitique à dureté interne élevée dont la résistance à l'usure, à la rupture par fatigue et à la fracture retardée sont excellentes ainsi que sur son procédé approprié de fabrication. De façon spécifique, l'invention porte sur un rail en acier perlitique contenant en masse C : 0,73 à 0,85 %, Si : 0,5 à 0,75 %, Mn : 0,3 à 1,0 %, P : 0,035 % ou au-dessous, S : 0,0005 à 0,012 %, Cr : 0,2 à 1,3 %, V : 0,005 à 0,12 % et N : 0,0015 à 0,0060 %, le complément consistant en Fe et les impuretés inévitables, et ayant un rapport [%Mn]/[%Cr] de 0,3 ou au-dessus et au-dessous de 1,0 (dans lequel [%Mn] représente la teneur en Mn et [%Cr] représente la teneur en Cr) et un rapport [%V]/[%N] de 8,0 à 30,0 (dans lequel [%V] représente la teneur en V et [%N] représente la teneur en N) et dont le champignon de rail présente une dureté interne de Hv380 ou au-dessus et au-dessous de Hv480 en termes de dureté Vickers (Hv) dans une plage de profondeur d'au moins 25 mm à partir de la surface du champignon de rail.

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