Tungsten Alloys

Tungsten Alloy Facts

Heavy Metal is made possible by P/M techniques. This is a technique where tungsten powder is mixed with nickel, iron or copper powder. It is then compacted and liquid phase sintered. The result is a very high-density machinable material having a homogeneous structure with no grain direction. This provides a material with unique physical properties and applications.

Technical Information

Tungsten Alloys

Applications of Heavy Metal

Because of the physical properties of heavy metal, it is often used as both a weight and structural member. Weights and counterbalances for aircraft control surfaces and rotor blades, guidance platforms, balancing of flywheels and crankshafts, vibration damping governors, and fuse masses and weights for self-winding watches are typical applications. Other specific applications include:


Radiation Shielding

Because of the absorption characteristics of heavy metals, approximately one-third less material is required as compared to lead. Heavy metal is used for source shielding on oil wells and industrial instrumentation as well as for collimators and shielding in medical therapy and detection equipment.


Rotating Inertia Members

Due to the material's unique combination of physical properties and high density, it can be rotated at extremely high speeds. This aspect makes it ideal for use in gyroscope rotors, flywheels, and rotating members for governors.


Projectiles

Properties such as elongation and hardness make heavy metal advantageous for use in kinetic energy penetrators. These properties can also be varied by manufacturing technique and additives. Heavy metal is used in squares, spheres, and projectile shapes for hypervelocity armor penetrating applications.


Boring Bars and Grinding Quills

Heavy metal is used for "chatter-free" boring and grinding. It is used where rigidity and minimum vibration are desirable. Heavier cuts and a better finish can be achieved with tools made of heavy metal. Longer tool extensions, with ratios up to 9:1 are also possible depending on the diameter of the tool.


Other benefits include:

Longer tool life due to the lower amount of heat generated as a result of the minimum chatter and high thermal conductivity that heavy metal provides. Heavy metals do not anneal during brazing, therefore carbide can be brazed directly with no effect on the shank. This allows continued use. Higher accuracy and trouble-free grinding are achieved when used as grinding quills. This is due to the vibration damping effect and rotating inertia characteristics of heavy metals.

Heavy metal is often used in place of Tungsten Carbide boring bars because:

  • they have a higher density
  • they are readily machinable
  • they are less prone to chipping and breakage
  • lower cost is achieved both with material and finishing

Typical Properties of Heavy Metals

Properties of Heavy Metals

Atomic Weight: 183.85
Density: 19.3 g/cc
Melting Point: 3695 K, 3422°C, 6192°F
Boiling Point: 6173 K, 5900°C, 10652°F

Corrosion resistance of the refractory metals is second only to that of the noble metals. Unlike the noble metals, however, the refractory metals are inherently reactive.Such reactivity is a decided plus for corrosion resistance. On contact with air or any other oxidant, refractory metals immediately form an extremely dense, adherent oxide film. This passivating layer prevents access of the oxidant to the underlying metal and renders it resistant to further attack.Unfortunately, these oxides spall or volatize at elevated temperatures, leaving the metals susceptible to oxidation at approximately 300 to 500 degrees C. For high-temperature applications under non-reducing conditions, the refractory metals must be protected by an applied coating, such as a metal silicide.

Mass:
Density at 20° C gm/cc - 19.3
Density at 20° C lb/in 3 - 0.697


Thermal Properties:
Melting Point, °C - 3410
Boiling Point, °C - 5900
Linear Coefficient of Expansion per °C - 4.9 x 10-6
Thermal Conductivity at 20°C, cal/cm2/cm°C/sec. - 0.40
Specific Heat, cal/g/°C; 20°C - 0.032

Electrical Properties:
Conductivity, % IACS - 31%
Resistivity, microhms-cm; 20°C - 5.5
Temperature Coefficient of Resistivity per °C (0-100°C) - 0.0046

Mechanical Properties:
Tensile Strength at room temperature, psi - 100,000-500,000
Tensile Strength-500°C psi - 75,000-200,000
Tensile Strength-1000°C psi - 50,000-75,000

Young's Modulus of Elasticity; lb/in2:
Room Temperature - 59 x 106
500°C - 55 x 106
1000°C - 50 x 106

Spectral Emissivity:
(Wave Length approx. 0.65) - 0.37 (900°C)

Working Temperature: 1700°C

Recrystallizing Temp: 1200-1400°C

Stress Relieving Temp: 1100°C

Metallography:
Etchant - HF-NH; F sol
Polishing - Alumina - Rouge to finish

Stock Supplies

These sizes are in stock, subject to prior sale. We also supply other sizes and alloys as well. See additional material information below.

sheet

  • .001″ x 12″ Coil
  • .002″ x 12″ Coil
  • .003″ x 12″ x Coil
  • .005″ x 12″ x 36″
  • .005″ x 24″ x Coil
  • .010″ x 24″ x Coil
  • .015″ x 24″ x Coil
  • .020″ x 24″ x Coil
  • .025″ x 24″ x R/L
  • .030″ x 24″ x R/L
  • .040″ x 24″ x R/L
  • .060″ x 24″ x R/L
  • .080″ x 12″ x R/L
  • .090″ x 12″ x R/L
  • .125″ x 12″ x R/L
  • .187″ x 12″ x R/L

plate

  • .250″ x 12″ x R/L
  • .280″ x 24″ x R/L
  • .375″ x 12″ x R/L
  • .500″ x 12″ x R/L
  • .625″ x 12″ x R/L
  • .750″ x 12″ x R/L
  • 1.0″ x 12″ x R/L
  • 1.125″ x 12″ x R/L
  • 1.187″ x 12″ x R/L
  • 1.250″ x 12″ x R/L
  • 1.375″ x 12″ x R/L
  • 1.500″ x 12″ x R/L
  • 1.750″ x 12″ x R/L
  • 2.0″ x 12″ x R/L

wire

  • .001″ Dia x 100 ft
  • .002″ Dia x 100 ft
  • .003″ Dia x 100 ft
  • .004″ Dia x 100 ft
  • .004″ Dia x 10000 MTR
  • .005″ Dia x 100 ft
  • .006″ Dia x 100 ft
  • .007″ Dia x 200 ft
  • .008″ Dia x 1800 MTR
  • .010″ Dia x 100 ft
  • .015″ Dia x 100 ft
  • .020″ Dia x 100 ft
  • .030″ Dia x 100 ft

rod

  • .040″ Dia x R/L
  • .060″ Dia x R/L
  • .080″ Dia x R/L
  • .090″ Dia x R/L
  • .125″ Dia x R/L
  • .156″ Dia x R/L
  • .187″ Dia x R/L
  • .250″ Dia x R/L
  • .312″ Dia x R/L
  • .375″ Dia x R/L
  • .625″ Dia x R/L
  • .750″ Dia x R/L
  • .875″ Dia x R/L
  • 1.000″ Dia x R/L
  • 1.250″ Dia x R/L
  • 1.500″ Dia x R/L
  • 2.000″ Dia x R/L

Material Information

  • ASTM B760, ASTM F288 (ROD)
  • ASTM Certifications upon request
  • No cutting fee for custom lengths
  • Custom Sizes Available
  • Custom Stocking Plans Available

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