Tungsten Heavy Alloys
Tungsten heavy alloys material formed by adding a small amount of Ni, Fe, Cu, Co, Mo, Cr and other elements into tungsten (generally with the content of 80%~98%) serving as the basis. High-specific-gravity tungsten alloy has the density of 15.20~18.70g/cm3, and is also called high-specific-gravity alloy or high-density alloy material by people. High-specific-gravity tungsten alloy is mainly divided into two series, W-Ni-Fe (weakly magnetic) and W-Ni-Cu (non-magnetic) even W-Ni-Fe-Cu. By comparison, W-Ni-Fe alloy has a higher mechanical property and plays a great role in the national defence industry and various fields of national economy, is a very important military new material in the national defence industry, and is gradually generalized to all the civil industries.
a. Large specific gravity: the specific gravity is generally 16.5-18.75g/cm³;
b. High strength: the tensile strength is 700-1,000Mpa;
c. Strong ray absorption capacity: 30-40% higher than that of lead;
d. Large heat conducting coefficient: the heat conducting coefficient of tungsten alloy is 5 times that of mold steel;
e. Small thermal expansion coefficient: 1/2-1/3 of that of iron or steel;
f. Good conductivity: it can be widely applied to illumination and electric welding industries because of its good conductivity;
g. Good weldability and machinability.
Components, density and hardness performance
|
Level |
Nominal tungsten content, weight % |
Density，g/cm³ |
Hardness AB, Rockwell C (largest) |
|
1 |
90 |
16.85～17.25 |
32 |
|
2 |
92.5 |
17.15～17.85 |
33 |
|
3 |
95 |
17.75～18.35 |
34 |
|
4 |
97 |
18.25～18.85 |
35 |
|
A. Other hardness testing methods can be adopted if there are stipulations from demanders; |
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The lowest requirements on mechanical properties
|
Level |
Ultimate tensile strength |
Yield strength (0.2% residual deformation) |
Elongation (%) |
||
|
Kilopound/inch 2 |
MPa |
Kilopound/inch 2 |
MPa |
||
|
1 |
110B |
758 |
75 |
517 |
5B |
|
2 |
110B |
758 |
75 |
517 |
5B |
|
3 |
105B |
724 |
75 |
517 |
3B |
|
4 |
100 |
689 |
75 |
517 |
2B |
|
A. Measure by an extensometer with the accuracy of lower than 0.5%. |
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▲Sports Goods Series Products:
Benchmark of Tungsten Alloy Darts
Tungsten alloy fishing pendant series: bullet type, drop type, round pipe type, semi-drop type, cylindrical holed type
Tungsten bead and tungsten ball series: φ1.5mm -φ10mm, accuracy: ±0.01mm, application to fishing pendant counterweights, cluster bombs, medical instrument counterweights, sporting gun shots; φ0.1mm-φ10mm, accuracy: ±0.1mm, application to petroleum drilling balances, sporting gun shots.
▲Counterweight Products
High-density tungsten-based alloycounterweight series: balance weights for machinery; flyweights; petroleum drilling counterweight rods; dart rods; golf counterweight blocks; racing counterweight blocks; mobile phone and game machine vibrators; gyroscopes for aerospace; clock pendulum bobs; balance weight balls; anti-vibration cutter rods.
▲Medical Instruments
Medical tungsten alloy ray shielding material series: 1,tungsten alloygrating blades; 2,tungsten alloyprotection tanks: application to radioactive shielding walls in medical treatment; shielding needle pipes: application to medical radioactive liquid shields; tungsten alloy memories: application to tanks, boxes and other containers for storing radioactive substances; 3,collimators: collimators for tungsten alloy series inspection container systems in the application of medical linear accelerators and nuclear technologies; Co60: shielding of other radiation.
▲Electric Appliance Material
Electrodes for EDM and electrodes for electric resistance welding; high-specific-gravity electric contacts, contacts in air circuit breakers.
▲Military Products
Armour-piercing bullets; cluster bombs, balls, bars, square beads and cylinders; other tungsten alloyelectric rammer blocks; tungsten alloy in applications of nuclear technologies.
▲High-specific-gravity Alloy Heat Sink Material
With high-temperature resistance and good heat dissipation performance, high-specific-gravity tungsten alloy materialshave been started to be used as heat sink materials in quantity in various computer CPUs of the electronic industry at present.
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