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 |
| The 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 of non-ferrous 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 | The 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.
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.
