Arcelormittal Investigacion Y Desarrollo, S.l.

Arcelormittal

Fred B Fletcher

Bruce L Bramfitt

John A Davis, Jr

Jr John A Davis

A method of making a hypereutectoid, head-hardened steel rail is provided that includes a step of head hardening a steel rail having a composition containing 0.86-1.00 wt % carbon, 0.40-0.75 wt % manganese, 0.40-1.00 wt % silicon, 0.05-0.15 wt % vanadium, 0.015-0.030 wt % titanium, and sufficient nitrogen to react with the titanium to form titanium nitride. Head hardening is conducted at a cooling rate that, if plotted on a graph with xy-coordinates with the x-axis representing cooling time in seconds, and the y-axis representing temperature in Celsius of the surface of the head of the steel rail, is maintained in a region between an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 775&#xb0; C.), (20 s, 670&#xb0; C.), and (110 s, 550&#xb0; C.) and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 750&#xb0; C.), (20 s, 610&#xb0; C.), and (110 s, 500&#xb0; C.).

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Wayne, PA, United States of America

Fred B Fletcher