Tungsten VRN

Designation

Name The value
Designation GOST Cyrillic ВРН
Designation GOST Latin BPH
Transliteration VRN
By chemical elements ВHgNi

Description

Tungsten VRN is used: for the production by powder metallurgy drawn and forged bars used for the manufacture of electronic products; wire for light sources.

Standards

Name Code Standards
Wire from nonferrous metals and their alloys В74 GOST 19671-91
Bars В55 TU 11-77

Chemical composition

Standard Si Fe Al Mo Ca W
TU 11-77 - - - - - ≥99.9
GOST 19671-91 0.001-0.01 ≤0.01 0.001-0.01 ≤0.04 ≤0.02 ≥99.9
W is the basis.
According to TU 11-77, the content of tungsten is indicated including the content of thorium oxide. The sum of impurities and additives ≤ 0.10%. The sum of impurities and additives includes the following elements: iron, calcium, molybdenum, potassium, silicon, aluminum.
According to GOST 19671-91, the chemical composition is given for tungsten grade BPH.