Tungsten is one of the nonferrous metals，and it’s also an important strategic metal. In ancient times,
source:BangoAlloy authors:Joanna editor:系统管理员 Monday 2012-03-05
is one of the nonferrous metals,and it’s also an important strategic metal. In ancient times, tungsten ore is referred as “scheelite”. In 1781, Swedish chemist Karl William found scheelite,and extract the new acid element – tungstic acid. In 1783, Spanish Depp Asia found wolframite and extracted tungstate
. In the same year, tungsten powder was made by using the carbon reduction of tungsten trioxide for the first time, and named this element. Tungsten content in the crust is 0.001%. There are 20 kind minerals containing tungsten. Tungsten deposit is general formed by the activity of granitic magma. Tungsten, after smelting, is silver-white color with luster. It has extremely high melting point and hardness.