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Chrome-Molybdenum
Steel for Rails
· The
key to increasing the service life of rails is to increase their wear resistance,
particularly in curved track sections.
· High
wear resistance requires a fine pearlitic
microstructure that can be obtained in a
0.7 wt% C steel by heat treating the rail.
· Adding
Chromium (0.6wt%) and Molybdenum
(0.2wt%) to the Fe/C alloy shifts the "nose" of the CCT curve to lower
temperatures. This gives a higher nucleation rates and a finer pearlite
microstructure under the same cooling conditions as standard rails. |
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