ArcelorMittal S.A.
METHOD OF MAKING A TEE RAIL HAVING A HIGH STRENGTH BASE

Abstract:

A method of making a high strength base-hardened tee rail and the tee rail produced by the method. The method includes the steps of providing a carbon steel tee rail, the steel tee rail provided at a temperature between 700 and 800.degree. C.; and cooling the steel tee rail at a cooling rate that the temperature in .degree. C. of the surface of the base of said steel tee rail, is maintained in a region between: an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800.degree. C.), (80 s, 675.degree. C.), (110 s, 650.degree. C.) and (140 s, 663.degree. C.); and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700.degree. C.), (80 s, 575.degree. C.), (110 s, 550.degree. C.) and (140 s, 535.degree. C.).