ULTRA 76 TANTALUM ALLOY
H.C. Starck’s new tantalum alloy, ULTRA 76 has significant improvements in corrosion resistance in hydrochloric and sulfuric acid applications (HCI and H2SO4 acids) using higher temperatures and concentrations. Hydrogen embrittlement is minimized as hydrogen pickup is reduced by two magnitudes over standard NRC® 76 material with up to 100 times lower in HCl acid and 10 times lower in H2SO4 acid.
ULTRA 76 will help extend equipment life, reduce downtime and allow operations in more demanding environments compared to alternative materials.
The ULTRA 76 alloy eliminates the need for separate “Platinum Spot welding” application steps to protect against hydrogen embrittlement and maintains all the excellent mechanical properties of NRC® 76. There is a potential for increased operating temperatures in both HCI and H2SO4 acids and should allow simplified fabrication, avoid inconvenient repairs and production losses, and ensure reliable, long service-life.
A high strength alloy for corrosion applications is needed in all applications where tantalum’s physical properties are desired at a higher strength level than pure tantalum and better corrosion resistance in HCI and H2SO4 acids. H.C. Starck provides engineered material solutions for a wide range of industries where corrosion resistance is critical for improved performance. Applications include linings for piping, tubing for heat exchangers, and cladding for vessels.
Corrosion resistant tantalum alloys have been used in various process industries involving aggressive, hazardous chemicals. These tantalum alloys have been proven to provide the optimum cost-effective, long service-life for critical components in severe corrosive environments.
- Significantly improved corrosion resistance in HCl and H2SO4 acids
- Minimized hydrogen embrittlement rates compared to standard NRC® 76
- Up to 100 times lower in HCl acid
- Up to 10 times lower in H2SO4 acid
- Eliminates the need for a separate Pt application step to protect against H embrittlement
- Maintains all the excellent mechanical properties of NRC® 76
- Potential for increased operating temperatures in both HCl and H2SO4
High strength alloy for corrosion applications in heat transfer equipment, vessels, piping, etc., and all applications where tantalum’s physical properties are desired at a higher strength level than pure tantalum, and better corrosion resistance in HCl and H2SO4 acids.
0.006” to 0.1875” thick by widths up to 40” wide
0.1875” to 1” thick in common widths
015” to .035” wall x ½” to 2” diameter
Mechanical Properties (Design minimum)
|Temp °F ||Yield Strength |
0.2% offset KSI
|Tensile Strength |
Metallurgical CharacteristicsMaterial is single-phase tantalum with tungsten and platinum group metals in solid solution.
- Stress relieve at 2000°F
- Re-crystallize at 2400°F
3.6 X 10-6°F-1
0.0336 BTU/Lb °F
32 BTU/Hr-Ft °F
45 - 55 KPSI
35 - 45 KPSI
27 X 106 PSI
115 - 160
50 - 80
Coefficient of Expansion (20° - 500°C)
Specific Heat (at 100°C)
Thermal Conductivity (20° - 100°C)
Electrical Resistivity (0° - 100°)
Thermal Neutron Absorption Cross Section
Typical Ultimate Tensile Strength at 20°C
Typical Yield Strength at 20°C
Modulus of Elasticity
Hardness as Annealed (Typical) Vickers
Ultra 76 Products
- Bayonet Heaters: Single and multi-tube types for use in steam heating in corrosive atmospheres
- Heat Exchangers, Condensers and Coils
- Thermocouple Protection Sheaths: Loose Line or machined from solid
- Pumps, bodies or Cases, Shafts and Impellers: For corrosive chemical solutions
- Paddle Stirrers and Agitators: Solid or covered (loose-lined)
- Distillation Columns, Boilers and Condensers
- Tantalum Clad Dip Pipes, Heaters and Chemical Plant Equipments
- Repairs Kits: For tanks, vats and other glass-lined containers
- Crucibles: In standard and special shapes and sizes
- Furnaces and Furnace Parts:For use at temperatures up to 1371°C (2500°F) in controlled atmospheres