Description of Tungsten Heavy Alloy:
Tungsten Heavy metal alloys are pseudo-alloys of tungsten with a nickel-iron or nickel-copper matrix. They are produced by powder metal and sintering processes. The most outstanding property of heavy metal alloys is the high density of 17-19 g/cm³. Comparable densities are only reached by gold or platinum metals, which are considerably more expensive. Other exotic materials like rhenium, uranium or tantalum achieve these densities, but are either too difficult or expensive to obtain, or they have unsatisfactory mechanical characteristics.
Typical Properties of Tungsten Heavy Alloy:
|
|
90% W |
90% W |
92.5% W |
93% W |
95% W |
95% W |
97% W |
|
6% Ni |
7% Ni |
5.25% Ni |
Balance |
3.5% Ni |
3.5% Ni |
2.1% Ni |
|
4% Cu or Cu/Fe |
3% Fe |
2.25% Fe |
Ni Fe Mo |
1.5% Cu |
1.5% Fe |
0.9% Fe |
|
ASTM-B-777-07 |
Class 1 |
Class 1 |
Class 2 |
— |
Class 3 |
Class 3 |
Class 4 |
|
Density (g/cc) |
17 |
17 |
17.5 |
17.7 |
18 |
18 |
18.5 |
|
Hardness (HRC) |
24 |
25 |
26 |
30 |
27 |
27 |
28 |
|
Tensile Strength (MPa) |
600-800 |
550-850 |
600-800 |
600-900 |
550-800 |
600-850 |
550-900 |
|
Elongation (% in 1″) |
6~10 |
10~20 |
10~15 |
15~25 |
5~10 |
10~15 |
8~15 |
|
Proportional Elastic Limit (PSI) |
45,000 |
52,000 |
46,000 |
60,000 |
45,000 |
44,000 |
45,000 |
|
Magnetic Properties |
WNiCu NO |
Slightly |
Slightly |
Slightly |
NO |
Slightly |
Slightly |
|
WNiCu/Fe Slightly |
Magnetic |
Magnetic |
Magnetic |
Magnetic |
Magnet |
|
|
Advantages of Tungsten Heavy Alloy:
1.High density
2.Good machinability
3.Good mechanical properties
4.High modulus of elasticity
5.High absorption capacity against χ-rays and γ-rays
6.Harmless to the health and environment
Application of Tungsten Heavy Alloy:
Most of the major applications for tungsten alloys are based on its very high density where it is used to control or distribute weight in some way. Tungsten is up to 65% denser than lead and 130% denser than steel. Below are some of the main applications of tungsten heavy alloy.
1.Radiation shield, collimator, nuclear shielding, beam-stop, PET syringe shield, vial shield, isotope container, FDG container, multi leaf collimator.
2.Balanced part; tungsten sinker bar, heavy metal boring bar, sailboat, submarine and other vessels crank camshafts, holders for Well Logging, Racing Weights, vibration damping and dynamic balancing. tungsten sinker bar, tungsten bucking bar, tungsten boring bar, tungsten sinkers, tungsten alloy counterweights for golf and tungsten alloy dart parts spheres, cubes, and projectile shapes.
3.High-temperature die, electro heat , brass and copper, tooling for low-pressure die-casting of aluminum and brass, hot upsetting dies, filler rods for die repair, upsetting anvil block, electrical rivet.
4.Shrapnel head.
5.Penetrators.
6.Electrical contact.
7.Balanced ball for missile and plane; golf and tungsten alloy dart parts spheres, cubes, and projectile shapes.
8.Core for armor piercing bullet measurement.
Data sheet