Tantalum

Tantalum Facts

Its thermal conductivity is one-fourth that of molybdenum and its coefficient of expansion is one-third greater. Its elevated temperature strength is low compared with tungsten and molybdenum.Tantalum’s corrosion resistance is unusually good in most commercial combinations of acids. Pure tantalum recrystallizes at approximately 2200°F (1204°C).

Tantalum has several unique properties that have made it essential to certain applications, making it well worth the high cost. It offers approximately the same corrosion resistance to most acids and caustics as glass.

In addition, it can be fabricated by bending, roll forming, and welding with relative ease by personnel experienced with the metal. Tantalum’s ductility and density have made it popular with the military for armor penetration. Its density and nuclear stability make it a valuable material for containers of radioactive elements.

Technical Information

Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. It is part of the refractory metals group, which are widely used as minor components in alloys. The chemical inertness of tantalum makes it a valuable substance for laboratory equipment and a substitute for platinum.

Atomic Weight: 180.95
Density: 16.6 g/cc
Melting Point: 3290 K, 2996°C, 5462°F
Boiling Point: 5731 K, 6100°C, 9856°F
Coefficient of Thermal Expansion: (20°C) 6.5 x 10-6/°C
Electrical Resistivity: (20°C) 13.5 microhms-cm
Electrical Conductivity: 13% IACS
Specific Heat: .036 cal/g/°C
Thermal Conductivity: .13 cal/cm2/cm°C/sec

Tantalum is clearly the top of the line for corrosion resistance. The only media that can affect it are fluorine, hydrofluoric acid, sulfur trioxide (including fuming sulfuric acid), concentrated strong alkalis, and certain molten salts.

The corrosion resistance of tantalum can be compared to that of glass, although tantalum withstands higher temperatures and offers the intrinsic fabrication advantages of a metal. Tantalum equipment is frequently used in conjunction with glass, glass-lined steel, and other nonmetallic materials of construction. Tantalum is also used extensively to repair damage and flaws in glass-lined steel equipment.

Because of its high cost and lack of strength compared to its easy fabricability, tantalum is usually used as a lining over a stronger, less expensive base material.

Mass:
Density at 20° C gm/cc - 16.6
Density at 20° C lb/in 3 - 0.600


Thermal Properties:
Melting Point, °C - 2966
Boiling Point, °C - 6100
Linear Coefficient of Expansion per °C - 6.5 x 10-6
Thermal Conductivity at 20°C, cal/cm2/cm°C/sec. - 0.130
Specific Heat, cal/g/°C; 20°C - 0.036

Electrical Properties:
Conductivity, % IACS - 13%
Resistivity, microhms-cm; 20°C - 13.5
Temperature Coefficient of Resistivity per °C (0-100°C) - 0.0038

Mechanical Properties:
Tensile Strength at room temperature, psi - 35,000-70,000
Tensile Strength-500°C psi - 25,000-45,000
Tensile Strength-1000°C psi - 13,000-17,000

Young's Modulus of Elasticity; lb/in2:
Room Temperature - 27 x 106
500°C - 25 x 106
1000°C - 22 x 106

Spectral Emissivity:
(Wave Length approx. 0.65) - 0.46 (900°C)

Working Temperature: Room

Recrystallizing Temp: 1000-1250°C

Stress Relieving Temp: 850°C

Metallography:
Etchant - Alk.K3FE(CN) 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 8″ x 36″
  • .010″ x 12″ x R/L
  • .015″ x 12″ x R/L
  • .020″ x 12″ x R/L
  • .025″ x 12″ x R/L
  • .030″ x 12″ x R/L
  • .040″ x 12″ x R/L
  • .060″ x 12″ x R/L
  • .080″ x 12″ x R/L
  • .090″ x 12″ x R/L

plate

  • .250″ x 12″ x R/L
  • .375″ x 12″ x R/L
  • .500″ x 12″ x R/L

wire

  • .005″ Dia x 100 ft
  • .010″ Dia x 100 ft
  • .015″ Dia x 100 ft
  • .020″ Dia x 100 ft
  • .025″ Dia x 100 ft
  • .030″ Dia x 100 ft
  • .040″ Dia x 100 ft
  • .050″ Dia x 100 ft
  • .062″ Dia x 100 ft
  • .094″ Dia x R/L Coil

rod

  • .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
  • .500″ 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

tubing

  • .125″ OD x .015″ wall x R/L
  • .187″ OD x .020″ wall x R/L
  • .250″ OD x .020″ wall x R/L
  • .312″ OD x .020″ wall x R/L
  • .375″ OD x .025″ wall x R/L
  • .500″ OD x .030″ wall x R/L
  • .625″ OD x .050″ wall x R/L
  • .750″ OD x .060″ wall x R/L
  • .875″ OD x .040″ wall x R/L

Material Information

  • ASTM B708, ASTM B365, R05200
  • ASTM Certifications upon request
  • No cutting fee for custom lengths
  • Custom Sizes Available
  • Custom Stocking Plans Available

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