Refractory Metals

 

Refractory metals:

 

http://en.wikipedia.org/wiki/Refractory_metals

 

There are five refractory metals:

Tungsten,

Niobium,

Tantalum,

Molybdenum,

Rhenium.

These metals are resistant to heat and wear and poorly resistant to corrosion and oxidation.

 

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