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· Cost and capacity considerations
preclude using furnace reheating to control the steel rail microstructure.
· When alloyed with Cr
and
Mo,
the
austenitic rolled steel can be cooled on conventional racks and a fine pearlitic
structure
can be obtained.
· The Brinell
hardness
distribution in the rail cross section is shown.
· When fabricated from this alloy the rail has
a 60 % increase in life, does not develop martensite
in welds, and has an
extended fatigue
life, all without any change in the fabrication method.
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