Method for heat treating rail
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United States of America Patent
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-
Jun 7, 1988
Grant Date -
N/A
app pub date -
Aug 28, 1986
filing date -
Aug 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and assembly for heat treating a railway rail is provided which maintains balanced thermal and metallurgical deformations about rail neutral axes during the heat treating process to produce a substantially straight rail with only minimal requirements for subsequent mechanical steps for distortion compensation. The method comprises the first step of preheating the overall rail including head, web and flange portions to a first preselected temperature below a metallurgical transformation temperature. A second step comprises heating rail head and flange portions to preselected temperatures above the metallurgical transformation temperature with a balanced thermal deformation about rail neutral axes. A third step comprises quenching the rail head and flange portions to produce a desired metallurgical structure in the rail head portion for improved wear characteristics while still maintaining a balanced thermal deformation about the axes. A fourth step comprises after-cooling the entire rail.
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