Method for heat-treating profiled rolling stock
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United States of America Patent
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-
Aug 3, 2004
Grant Date -
Sep 26, 2002
app pub date -
Feb 15, 2002
filing date -
Jul 19, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the manufacture of a railroad rail of a steel alloy having a pearlitic microstructure. The rail is is shaped at a reduction rate of 1.8 to 8% and aligned straight in its longitudinal direction at a temperature between 770.degree. C. and 1050.degree. C., whereafter it is mounted with the head down and is allowed to cool slowly in still air to a temperature of 5 to 120.degree. C. above the Ar.sub.3 temperature, and upon reaching this temperature at least the rail head is dipped into a cooling liquid and is cooled to the temperature of conversion of an austenitic grain microstructure into a fine pearlitic grain microstructure.
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