Tungsten, a kind of metal element.Steel gray or silver white, high hardness, high melting point, no air erosion at room temperature; Mainly used in the manufacture of filament and high-speed cutting alloy steel, super-hard die, also used in optical instruments, chemical instruments. With the progress of science and technology, the development of metallurgical process, equipment and analytical technology, as well as the expansion of rare metal production scale, the purity, performance and variety of tungsten have been continuously improved.
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