Tungsten, a metal element. Atomic number 74, atomic weight 183.85. Steel gray or silver-white, high hardness, high melting point and room temperature from air erosion; the main purposes for the manufacture of the filament and high-speed cutting alloy steel, super-hard molds, but also for optical instruments, chemical apparatus. China is the world's largest tungsten storage country.
Tungsten are non-ferrous metals, is also an important strategic metal tungsten mine in ancient times known as the "witherite". 1781 by the Swedish chemist Carl. William. She Yeer found that scheelite and extract new elements and acid - acid, and in 1783 by the Spanish found Depp Air Asia, the wolframite extracted acid, the same year, using the carbon reduction of tungsten trioxide first tungsten powder, and named the element. The tungsten content in the earth's crust is 0.001%. Containing tungsten minerals are found in 20 kinds. Tungsten deposits in general along with the activity and the formation of granitic magma. After smelting After the tungsten is silver-white lustrous metal, high melting point and hardness.
Tungsten ore mined in the world, about 50% for high-quality steel smelting, approximately 35% for the production of hard steel, about 10% for the system tungsten wire, about 5% for other purposes. Tungsten can be manufactured firearms, rocket propulsion nozzles, cutting metal blades, drill bits, super-hard molds, wire drawing dies, etc., the use of tungsten is widely involved in mining, metallurgy, machinery, construction, transportation, electronics, chemical industry, light industry , textile, military, aerospace, science and technology, in various industrial fields.
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