Why is the track of the train made of steel?

In many existing train tracks, or on the train tracks under construction, you can see the orderly arrangement of track lines.  Rusted railways on these lines are the most puzzling, because rusty iron and steel products from external factors will reduce their characteristics and functions. railway track material

Why can such steel products still be used in such important traffic construction?  Can't stainless steel railway be used directly?  This looks beautiful and feels safer and more reliable.  However, railway construction is still the most suitable for this rusty railway. Stainless steel is not as good as it is. railway track material

At present, China uses high manganese steel rails in railway transportation construction. This material contains more manganese and carbon than ordinary steel, which increases the hardness and toughness of the rail to a certain extent and can withstand the high pressure of trains and the friction loss of wheels in daily operation.  The reason why stainless steel cannot be used is that it is easily damaged due to insufficient resistance to heat expansion and cold contraction. railway track material

Under the daily wind, rain and sun exposure, stainless steel can be easily damaged.  Although this kind of high-powered rail looks rusty, it only has a layer of rust on its surface and its interior is still intact.

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