METHOD FOR HEAT-TREATING BAINITE STEEL RAIL
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United States of America Patent
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Issued Date -
Apr 17, 2014
app pub date -
Oct 16, 2013
filing date -
Oct 17, 2012
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Abandoned
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Abstract
A method for heat-treating a bainite steel rail is disclosed. The method includes: cooling a rolled steel rail naturally to lower a surface temperature of a rail head of the steel rail to 460° C. −490° C.; cooling the steel rail forcely at a cooling rate of 2.0° C./s-4.0° C./s to lower the surface temperature of the rail head to 250° C.-290° C.; placing the steel rail in an ambient temperature until the surface temperature of the rail head is more than 300° C.; performing a tempering on the steel rail in a heating furnace at 300° C.-350° C. for 2 h-6 h; and air cooling the steel rail to the ambient temperature. Steel rails heat-treated by present method may have a stable retained austenite structure and a good mechanical performance.
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