High-strength pearlitic steel rail having excellent delayed...

Details High-strength pearlitic steel rail having excellent delayed... High-strength pearlitic steel rail having excellent delayed...

C - Chemistry, Metallurgy

22

C

C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/58 (2006.01) C21D 8/00 (2006.01)

Patent

CA 2645858

A high-strength pearlite rail which is inexpensive and, despite this, has a tensile strength of 1,200 MPa or higher and excellent delayed-fracture resisntance. The rail contains, in terms of mass%, 0.6-1.0% C, 0.1-1.5% Si, 0.4-2.0% Mn, up to 0.035% P, and 0.0005-0.010% S, the remainder being iron and unavoidable impurities. It has a tensile strength of 1,200 MPa or higher. In a lengthwise-direction section of at least the head part of the rail, A-type inclusions have a major-axis dimension of 250 µm or smaller and the number of A-type inclusions having a major-axis dimension of 1-250 µm is less than 25 per mm2 of the area examined.

L'invention concerne un profilé de perlite haute résistance qui est peu coûteux mais possédant néanmoins une résistance à la traction de 1 200 MPa ou plus et une excellente résistance à la rupture différée. Le profilé contient, en termes de % en masse, 0,6-1,0 % C, 0,1-1,5 % Si, 0,4-2,0 % Mn, jusqu'à 0,035 % P, et 0,0005-0,010 % S, le reste étant du fer et des impuretés inévitables. Il possède une résistance à la traction de 1 200 MPa ou plus. Dans la section dans le sens de la longueur d'au moins la partie de tête du profilé, des inclusions de type A ont une dimension selon l'axe principal de 250 µm ou moins et le nombre d'inclusions de type A ayant une dimension selon l'axe principal de 1-250 µm est inférieur à 25 par mm2 de la surface examinée.

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