Tungsten bar：
Appearance : Silver gray metallic luster .
Grade : W-1 W-2 W-3 W-4
Density：≥17.0g /cm3
Main application : W-1 is used for making the pole , wire drawing , or doing steel-making additive . W-4 is used as the steel-making additives .
The impurity content accords with GB3459-82
Grade W-1 W-2 W-3 W-4
The impurity
Content is not more than % Pb 0.001
Bi 0.001
Sn 0.001
Sb 0.001
As 0.002
Fe 0.005 0.005 0.010 0.05
Ni 0.003 0.003 0.005 0.30
Al 0.002 0.002 0.005 0.005
Si 0.003 0.003 0.010 0.010
Ca 0.003 0.003 0.005 0.005
Mg 0.002 0.002 0.005 0.010
Mo 0.010 0.010 0.20 0.20
P 0.001 0.001 0.002 0.005
C 0.005 0.008 0.010 0.010
O 0.003 0.003 0.005 0.010
N 0.003 0.003
