Tungsten VM

Designation

Name The value
Designation GOST Cyrillic ВМ
Designation GOST Latin BM
Transliteration VM
By chemical elements ВCu

Description

Tungsten VM is used: for production of wire for the manufacture of light sources.

Note

Thoriated tungsten (tungsten with thorium).

Standards

Name Code Standards
Wire from nonferrous metals and their alloys В74 GOST 19671-91

Chemical composition

Standard W Th
GOST 19671-91 ≥99.7 0.17-0.25
W is the basis.
According to GOST 19671-91, the chemical composition is given for a tungsten alloy of the brand VM. The Thorium (Th) column indicates the mass fraction of thorium oxide in the alloy, which should be in the range 0.17-0.25. The total mass fraction of impurities should not be more than 0.050%.