Tungsten W-7

  • Tungsten B (VA)
  • Tungsten BM
  • Alloy VNZH 7-3
  • Alloy VNZh-90
  • Alloy VNZh-95
  • Alloy VNZh-97 (VNZh 97.5)
  • Alloy VNM 3-2
  • Tungsten VRN
  • Tungsten VT-10
  • Tungsten VT-15
  • Tungsten BT-30
  • Tungsten BT-50
  • Tungsten BT-7
  • Alloy SVI-1

    • Designation

    Name The value
    Designation GOST Cyrillic ВТ-7
    Designation GOST Latin BT-7
    Transliteration VT-7
    By chemical elements ВTe-7

    Description

    Tungsten W-7 is used: for production of wire for the manufacture of light sources; drawn and forged bars with diameter from 1.0 mm to 12 for the manufacture of electronic products.

    Note

    Thoriated tungsten (tungsten with thorium).

    Standards

    Name Code Standards
    Wire from nonferrous metals and their alloys В74 GOST 19671-91
    Bars В55 TU 48-19-533-92

    Chemical composition

    Standard W Th
    TU 48-19-533-92 Rest 0.7-1
    GOST 19671-91 ≥98.96 0.7-0.9
    W is the basis.
    According to GOST 19671-91 the chemical composition is given for a tungsten alloy of the brand VT-7. The Thorium (Th) column indicates the mass fraction of thorium oxide in the alloy, which should be within the range of 0.70-0.90. The total mass fraction of impurities should not be more than 0.050%.
    According to TU 48-19-533-92, the chemical composition is given for a tungsten alloy of the brand VT-7. The Thorium (Th) column indicates the mass fraction of thorium oxide in the alloy, which should be within the range of 0.70-1.00. The total mass fraction of impurities should not be more than 0.050%.
    The mass fraction of tungsten, including thorium oxide, must be at least 99.95%. The amount of impurities includes iron, calcium, molybdenum, potassium, silicon, aluminum.