Nimonic Alloys
Nimonic 80A (UNS N07080) — Composition, Properties & Supply
Nimonic 80A (UNS N07080) is a Ni-Cr superalloy precipitation hardened by γ′ with 1.8–2.7% Ti and 1.0–1.8% Al. Below 815 °C it offers excellent creep strength and oxidation resistance, serving aero-engine turbine blades, exhaust valves and high-temperature bolting.
What is the chemical composition of Nimonic 80A?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | Balance |
| Cr | Cr | 18.0–21.0 |
| Ti | Ti | 1.80–2.70 |
| Al | Al | 1.00–1.80 |
| Co | Co | ≤ 2.00 |
| Fe | Fe | ≤ 3.0 |
| C | C | ≤ 0.10 |
| Si | Si | ≤ 1.00 |
| Mn | Mn | ≤ 1.00 |
| B | B | ≤ 0.008 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Nimonic 80A?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 1000 MPa (aged) | Room temperature |
| Yield strength (0.2% offset) | ≥ 620 MPa (aged) | Room temperature |
| Elongation | ≥ 20 % | Gauge length 50 mm / 4D |
| Hardness | ≥ 28 HRC | Brinell / Rockwell |
What are the physical properties of Nimonic 80A?
| Property | Value |
|---|---|
| Density | 8.19 g/cm³ |
| Melting range | 1320–1365 °C |
| Thermal conductivity | 11.2 W/m·K |
| Elastic modulus | 222 GPa |
| Maximum service temperature | 815 °C |
What are the key characteristics of Nimonic 80A?
- γ′ strengthened with excellent creep resistance below 815 °C
- Oxidation and combustion-gas corrosion resistance
- Good high-temperature fatigue strength
- Responds to solution plus ageing heat treatment
Where is Nimonic 80A used?
- Aero-engine turbine and guide vanes
- Internal combustion exhaust valves
- High-temperature bolts and springs
- Gas turbine components
- High-temperature nuclear fasteners
Which standards and specifications cover Nimonic 80A?
- ASTM B637
- AMS 5766
- BS HR 401
- UNS N07080
What product forms are available?
Frequently asked questions
How do the strength ranges of Nimonic 80A and Inconel 718 compare?
80A is γ′ strengthened and has better creep strength than 718 between 700 and 815 °C. 718 relies on γ″ and is stronger below 650 °C, but γ″ coarsens rapidly above that. Choose 80A for high-temperature creep service and 718 for mid-temperature high strength.
Need Nimonic 80A bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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