Basic Knowledge about Tungsten
This article will tell you some basic knowledge about tungsten.

Important countries that deposit tungsten are USA, South Korea, Bolivia, Russia, and Portugal. China (Jiangxi and Hunan Province) is reported to have about 75% of the world's tungsten resources.
The amount of tungsten in the Earth’s crust is estimated to be 1.5 parts per million, or about 1.5 grams per ton.

Characteristics of tungsten:
Tungsten metal has grayish lustre. Among metals, tungsten has the highest melting point, the highest tensile strength and the lowest coefficient of linear thermal expansion. Tungsten is ordinarily brittle at room temperature. Pure tungsten can, however, be made ductile by mechanical working at high temperature and can then be drawn into tungsten wire.

Applications of tungsten
Tungsten was commercially employed as a lamp filament material and thereafter used in many electrical and electronic applications. Much tungsten goes into the production of tungsten steels, and some has been used in the aerospace industry to fabricate rocket-engine nozzle throats and leading-edge reentry surfaces. 
All above are some basic knowledge about tungsten.

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