Invention Grant
US08210019B2 Method for producing pearlitic rail excellent in wear resistance and ductility 有权
生产珠光体钢轨的优良耐磨性和延展性的方法

Method for producing pearlitic rail excellent in wear resistance and ductility
Abstract:
The invention provides a method for producing a pearlitic rail by rough hot rolling and finish hot rolling a billet. In the finish hot rolling, the billet is rolled at a rail head surface temperature in a range of not higher than 900° C. to not lower than the Ar3 transformation point or Arcm transformation point to produce a head cumulative reduction of area of not less than 20%, where the reaction force ratio of the finish rolling is not less than 1.25. The finish hot rolled rail head surface is subjected to accelerated cooling or spontaneous cooling to a temperature of 550° C. or less at a cooling rate of 2 to 30° C./seconds, thereby refining the rail head structure to attain a hardness within a predetermined range, and improving rail wear resistance and ductility.
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