Alloy residence permit 7-3
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ВНЖ 7-3 |
| Designation GOST Latin |
BHZh 7-3 |
| Transliteration |
VNG 7-3 |
| The chemical elements |
ВNiFe 7-3 |
Description
Alloy residence permit 7−3 is used: for the manufacture of small to medium sized parts with weight up to 2.0 kg of various forms used in instrument making and in the production of special equipment for protection from ionizing radiation and hard x-rays; parts of the defense industry, medical x-ray equipment; parts of the instrument applied, experimental and nuclear physics; beams and gyrocompasses in devices for orientation in space.
Note
Powder heavy tungsten-Nickel-iron alloy.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
TU 48-19-28-82, TU 48-19-54-91 |
Chemical composition
| Standard |
Ni |
Fe |
W |
| TU 48-19-54-91 |
6.8-7.4 |
2.8-3.4 |
The rest |
W is the basis.
According to TU 48-19-54-91, the mass fraction of the components is indicated for the preparation of the powder mixture and is not subject to control on the products.
Mechanical characteristics
| σB, MPa |
d5, % |
HRC |
| The product of the powder sintered |
| ≥687 |
≥3 |
20-30 |
Description mechanical marks
| Name |
Description |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
Physical characteristics
| Temperature |
r, кг/м3 |
| 20 |
16500-17350 |
A description of the physical symbols
| Name |
Description |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
