Precipitation-hardenable nickel-chromium alloy strengthened by titanium and aluminum additions.
Maintains high tensile and creep-rupture strength at operating temperatures up to 815°C (1500°F).
Offers low cobalt content, making it the specified material for nuclear reactor applications.
Available in multiple forms including bar, sheet, plate, wire, and forging stock
Nimonic 80A Nickel Alloy
Nimonic 80A is a precipitation-hardenable nickel-chromium alloy strengthened by the addition of titanium and aluminum. Developed in the 1940s, this wrought superalloy exhibits exceptional tensile and creep-rupture properties at temperatures up to 815°C (1500°F), combined with good corrosion and oxidation resistance . While largely superseded by Nimonic 90 and Inconel X-750 for many applications, Nimonic 80A remains the preferred choice for nuclear applications due to its low cobalt content .
Key Features
- Excellent high-temperature strength up to approximately 815°C (1500°F)
- Superior oxidation and corrosion resistance
- Enhanced creep rupture properties for long service life
- Outstanding fatigue resistance in cyclic thermal environments
- Good weldability and machinability
- Stable performance in high-pressure and high-stress applications
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Learn more about Nimonic alloy properties
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | Balance |
| Chromium (Cr) | 18.0 – 21.0 |
| Titanium (Ti) | 1.8 – 2.7 |
| Aluminum (Al) | 1.0 – 1.8 |
| Iron (Fe) | 3.0 max |
| Cobalt (Co) | 2.0 max |
| Carbon (C) | 0.04 – 0.10 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Copper (Cu) | 0.2 max |
| Boron (B) | 0.008 max |
| Sulfur (S) | 0.015 max |
Mechanical Properties
| Condition | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| Annealed | 800 – 1000 MPa (116 – 145 ksi) | – | – |
| Annealed + Aged | 1200 – 1400 MPa (174 – 203 ksi) | 780 MPa (113 ksi) | 30% |
| Spring Temper | 1300 – 1500 MPa (189 – 218 ksi) | – | – |
| Spring Temper + Aged | 1500 – 1800 MPa (218 – 261 ksi) | – | – |
| Solution Annealed & Aged | 1000 MPa (145 ksi) | 620 MPa (90 ksi) | 20% |
Available Forms
| Product Form | Size Range | Specifications |
|---|---|---|
| Bar & Rod | 3mm – 300mm diameter | ASTM B637, BS HR1 |
| Sheet & Strip | 0.5mm – 5mm thickness | BS HR201 |
| Plate | 5mm – 100mm thickness | BS HR201 |
| Wire | 0.025mm – 21mm diameter | ASTM B637 |
| Pipe & Tube | Custom sizes | BS HR401 |
| Forgings | Custom configurations | ASTM B637 |
