Nimonic 80A, 2.4631, UNS N07080, NCF 80A, NC20K14
Nimonic 80A (UNS N07080 / 2.4631) is a high-performance nickel-chromium superalloy with outstanding high-temperature strength, creep resistance, and oxidation resistance. It is widely used in aerospace, power generation, and industrial heating applications.
For high-temperature bolting, turbine blades, and exhaust systems, Nimonic 80A remains a preferred choice due to its reliability under extreme conditions.
Table of Contents
What is Nimonic 80A, 2.4631, UNS N07080, NCF 80A, NC20K14?
Nimonic 80A is a precipitation-hardened nickel-chromium superalloy known for its excellent high-temperature strength, oxidation resistance, and creep resistance. It is widely used in aerospace, gas turbines, and industrial heating applications.
Key Features:
- High tensile and creep strength at elevated temperatures (up to 815°C / 1500°F)
- Good corrosion and oxidation resistance
- Excellent fatigue resistance
- Suitable for forging, machining, and welding
Applications
Due to its superior high-temperature properties, Nimonic 80A is used in:
- Aerospace: Turbine blades, exhaust systems, combustion chambers
- Power Generation: Gas turbine components, bolts, fasteners
- Industrial Furnaces: Heat treatment fixtures, radiant tubes
- Automotive: Turbocharger components
Chemical Composition (%)
| Element | Nimonic 80A (AMS 5542) |
2.4631 (DIN/W-Nr) |
UNS N07080 |
NCF 80A (JIS H4551) |
NC20K14 (AFNOR) |
|---|---|---|---|---|---|
| Ni | Bal. | Bal. | Bal. | Bal. | Bal. |
| Cr | 18.0 - 21.0 | 18.0 - 21.0 | 18.0 - 21.0 | 18.0 - 21.0 | 18.0 - 21.0 |
| Ti | 1.8 - 2.7 | 1.8 - 2.7 | 1.8 - 2.7 | 1.8 - 2.7 | 1.8 - 2.7 |
| Al | 0.5 - 1.8 | 0.5 - 1.8 | 0.5 - 1.8 | 0.5 - 1.8 | 0.5 - 1.8 |
| Fe | ≤ 3.0 | ≤ 3.0 | ≤ 3.0 | ≤ 3.0 | ≤ 3.0 |
| C | ≤ 0.10 | ≤ 0.10 | ≤ 0.10 | ≤ 0.10 | ≤ 0.10 |
| Mn | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Si | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Cu | ≤ 0.2 | ≤ 0.2 | ≤ 0.2 | ≤ 0.2 | ≤ 0.2 |
| S | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 | ≤ 0.015 |
Material Properties
Room Temperature Properties (Solution Treated + Aged)
| Property | Value |
|---|---|
| Tensile Strength | 950 - 1200 MPa |
| Yield Strength (0.2%) | 600 - 800 MPa |
| Elongation (%) | 15 - 25% |
| Hardness (HRC) | 28 - 35 |
High-Temperature Mechanical Properties
| Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) |
|---|---|---|
| 600 | 800 - 950 | 550 - 700 |
| 700 | 650 - 800 | 450 - 600 |
| 800 | 450 - 600 | 300 - 450 |
Creep & Rupture Strength
| Temperature (°C) | Stress for 1000h Rupture (MPa) |
|---|---|
| 700 | 300 - 400 |
| 800 | 150 - 250 |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 8.19 |
| Melting Range (°C) | 1320-1365 |
| Thermal Conductivity (W/m·K) | 11.7 (at 20°C) |
| Electrical Resistivity (μΩ·m) | 1.25 |
Heat Treatment
Solution Treatment
- 1080°C (1975°F) for 4-8 hours, air cool
Aging (Precipitation Hardening)
- 700-750°C (1290-1380°F) for 16-24 hours, air cool
Delivery Conditions
- Solution Annealed (Soft Condition for Machining)
- Solution Annealed + Aged (High-Strength Condition)
Processing Performance
- Machining: Difficult due to work hardening; carbide tools recommended.
- Welding: Weldable using TIG or resistance welding; post-weld heat treatment required.