Tungsten

Tungsten Facts

Tungsten has a long history of use for filaments in the lamp industry. It offers exceptionally high strength at very high temperatures. In fact, it has the best high temperature strength of the four common refractory metals. Its high temperature strength, combined with its good electrical resistivity, have made it a popular choice for other applications in addition to filaments.

It is used for heating elements in vacuum furnaces that exceed the temperatures of molybdenum and tantalum as well as other heater applications. Tungsten has also gained wide acceptance as an essential material in electrical contacts, glass-to-metal seals, supports, and electrodes.

Technical Information

Tungsten is a greyish-white lustrous metal, which is a solid at room temperature. Tungsten has the highest melting point and lowest vapor pressure of all metals, and at temperatures over 1650°C has the highest tensile strength. It has excellent corrosion resistance and is attacked only slightly by most mineral acids.

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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