Tantalum Wire UNS R05200 UNS R05400

Tantalum is ductile, superconductive, has high-temperature strength, low thermal expansion, and high capacitance.

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Tantalum Shaped, Flat, Square, Round, Fine Wire, Plated and Un-plated
ASTM B 365, ASTM B708, ASTM F 560
R05200: Electron beam or vacuum-arc cast tantalum
R05400: Sintered tantalum

Tantalum Wire Description

Tantalum Alloy Description

Tantalum is ductile, superconductive, has high-temperature strength, low thermal expansion, and high capacitance. It is tough, durable, and ductile, tantalum also offers good workability and weldability. In addition, it possesses the ability to grow uniform and stable oxides with good dielectric properties. Tantalum has excellent resistance to corrosive attack by acids and liquid metals.

  • Manufacture and repair of chemical process equipment and heat exchangers
  • Rupture discs
  • Capacitors
  • Semiconductors
  • Medical implants
  • Medical Devices

Chemistry Typical

Carbon: 0.010 max
Oxygen: 0.0150 max (0.300 max for R05400)
Nitrogen: 0.010 max
Hydrogen: 0.0015 max
Niobium: 0.100 max
Iron: 0.010 max
Titanium: 0.010 max
Tungsten: 0.05 max
Molybdenum: 0.020 max
Silicon: 0.0050 max
Nickel: 0.010 max
Tantalum: Balance

Physical Properties

Density: 0.6 lb/in³, 16.65 g/cm³

Specific Heat: BTU/lb-°F (J/g-°C)
At 212°F (100 °C): 0.0336 (0.141)

Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K)
68-212 °F (20-100 °C): 384 (55.3)

Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C)
68-932 °F (20-500 °C): 3.60 (6.48)

Modulus of Elasticity: KSI(MPa)
27 x 10³ (186 x 10³) in tension

Melting Point (approx.): 5463°F (3017°C):

Mechanical Properties of Tantalum at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 25 KSI min (172MPa min)
Yield Strength: 15 KSI min (103 MPa min )
Elongation: 25% min

Properties Tempered

Tantalum can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties of Tantalum

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations

Standard Wire Finishes

Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold rolled”

Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative applications

Soap (round wire only): Soap is used as a lubricant in the drawing process and is not removed. It acts as a lubricant during customer part forming operation. A soap finish is available in tempered products.

Plated: Many plating options are available.
*Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.


Continuous Coils
Cut to lengths
Precision cutting

Heat Treatment

Tantalum is non hardenable by heat treatment.

Welding Tantalum

For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”.

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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