• en
  • de

WOLFRAM INDUSTRIE
Traunstein Tel. +49 (0) 861 9879-0

BAYERISCHE METALLWERKE GMBH
Dachau Tel. +49 (0) 8131 703-0

FAQ

GENERAL

With 19.25 g/cm³ the density of tungsten is about 2.5 times higher than that of steel (~7.85 g/cm³).

Tungsten has a hardness of about 350 HV10, although it also depends very much on the deformation and the process temperatures.

Automotive (cubic – face-centred structure)
KRZ (cubic – body-centred structure)
Hexagonal (hexagonal structure)

Tungsten has the same lattice structure as ferritic steel. Cubic body-centred metals have a transition temperature between the brittle and ductile phase.
For ferrite this is ~ 20 °C, for tungsten, it may be at 200-400 °C. Which is why tungsten is brittle at room temperature.

3420°C, the highest of all pure metals.

Sintering
Oxidation
Crystallisation

It can form various tungsten oxides and non-stoichiometric mixed oxides with characteristic colours. WO2 bluish – WO3 yellowish

750°C
850°C
1000°C

The yellowish oxide decomposes the surface and is harmful in most cases.

direct sintering
indirect sintering

In indirect sintering, in contrast to direct sintering of pure tungsten, the microstructure forms via liquid phase sintering.

… a compressed powder (not sintered)

The pressing can be done with and without the addition of organic binder.

TRIAMET® (tungsten-based heavy alloy)

Element 1: tungsten
Element 2: nickel
Element 3: iron

Tungsten with a binder phase of iron and nickel forms a characteristic microstructure with a globular structure.

Element 1: tungsten
Element 2: nickel
Element 3: copper

Our S-material is used wherever the material should not be magnetisable.

Inserting the pressed green blank into a sintering furnace
Clamping the compacted green blank between two electrical contacts

Pure tungsten is sintered at about 80% of the melting temperature [K]. Such temperatures can be achieved most easily by electrical resistance heating.

750 – 1000 N/mm²

For comparison: V2A steel (1.4301) usually has a tensile strength between 500-700 N/mm²

10 – 30%

It is the tungsten product with one of the highest strains.

Material properties such as high density, low affinity to aluminium and copper, high bending stiffness and easy machinability are used for:

  • Shielding for nuclear medicine
  • Balance weights for engine construction
  • Tool holders
  • Foundry moulds
  • Others

Depending on the size of the porosity, elongation at break and ductility are reduced.

TRIAMET®G is slightly ferromagnetic.
TRIAMET®S is not magnetic (Paramagnetic).

1300°C
Our recommendation is not to exceed the application temperature of 1000°C.

… 1,300 °C?
The material loses strength
… 1,440 °C?
The binder phase melts

TUNGSTIT® (WCu and WAg)

DOTIMET® (tungsten granulate)

Tungsten granulate serves as accelerator material for determining the carbon and sulphur content. Often we used this granulate with a grain size between 0.5 – 2.0mm.

Bulk and tap density
Granulate for mass balancing has good damping properties, which can be advantageous in dynamic systems.

Do you have any further questions about Wolfram products?

Your first and last name

Your e-mail address (mandatory field)

Your question(s) (mandatory field)

<script>