It is a non-ferrous metal and an important strategic metal, and in ancient times tungsten was called "heavy stone". Wilhelm Scheyer in the same year, the first tungsten powder was obtained by reducing tungsten trioxide with carbon, and the element was named. the content of tungsten in the earth's crust is 0.001%. There are 20 types of tungsten-bearing minerals that have been discovered. Tungsten deposits are generally formed along with the activity of granitic magma. after smelting, tungsten is a silvery-white, lustrous metal with a very high melting point and hardness. Steel gray or silvery white, high hardness, high melting point, not subject to air erosion at room temperature; the main use is the manufacture of lamp filaments and high-spEed cutting alloy steel, super hard die, also used in optical instruments, chemical instruments