Magical Tungsten

Tungsten,a metal element, atomic number 74, atomic weight 183.85.Steel gray or silvery-white, high hardness, high melting point, room temperature without air attack; mainly used for the manufacture of the filament and high-speed cutting steel, hard mold, also used in optical instruments, chemistry instruments. China is the world's largest tungsten storage power.
 
Tungsten is part of non-ferrous metals, is also an important strategic metal, tungsten ore in ancient times was called "heavy stone." 1781 by the Swedish chemist Carl Wilhelm Scheele discovered scheelite, and extract new elements acid - acid, in 1783 by the Spanish Air Asia Depp found wolframite also extract the acid, the same year, with carbon reduction of tungsten trioxide first got tungsten powder, and named the element. Tungsten content in the crust is 0.001%. Tungsten minerals have been found in 20 species. Tungsten deposit is generally accompanied by granitic magma activity and the formation. After tungsten smelting after the silver-white lustrous metal, high melting point, great hardness. Tungsten is the highest melting points.

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