Alloy 263 NIMONIC® 263 – W. Nr. 2.4650 / UNS N07263 / ASTM B564, AMS 5872
Alloy 263 NIMONIC® 263
Alloy 263 NIMONIC® 263 is a precipitation-hardenable nickel-cobalt-chromium-molybdenum-based alloy, originally developed by Rolls-Royce to offer excellent machinability and high ductility in welds, as a replacement for alloy 80A.
Designed for gas turbine sheet metal components, it is now available in all standard forms, including bars, sheets and tubes. It maintains high mechanical properties and creep resistance up to approximately 800°C, making it ideal for aerospace and industrial applications.
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Reference standards:
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AMS 5872 (sheet, plate and strip)
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BS HR 10, HR 206, HR 404
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DIN 17750, 17751, 17752, 17753, 17754
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AECMA PrEn 2199–2203, 2418
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UNS N07263 / W. Nr. 2.4650
Chemical composition (%)
| Element | Value (%) |
|---|---|
| Nickel (Ni) | Balance |
| Cobalt (Co) | 19.0 – 21.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Molybdenum (Mo) | 5.6 – 6.1 |
| Titanium (Ti) | 1.9 – 2.4 |
| Aluminium (Al) | up to 0.6 |
| Iron (Fe) | up to 0.7 |
| Manganese (Mn) | up to 0.6 |
| Silicon (Si) | up to 0.4 |
| Carbon (C) | 0.04 – 0.08 |
| Sulphur, Phosphorus, Boron, Bismuth, Lead | Traces |
Mechanical properties (bars, solution + aging 2h/1150°C + 8h/800°C)
| Temperature (°C) | 0.2% Yield Strength (MPa) | Rm (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 585 | 1004 | 45 |
| 400 | 490 | 849 | 46 |
| 800 | 460 | 772 | 27 |
| 1000 | 145 | 232 | 15 |
Mechanical properties (sheet, 3–10 min/1150°C + 8h/800°C)
| Temperature (°C) | 0.2% Yield Strength (MPa) | Rm (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 580 | 973 | 39 |
| 400 | 470 | 816 | 43 |
| 800 | 440 | 757 | 23 |
| 1000 | 135 | 201 | 20 |
Physical properties
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Density: 8.36 g/cm³
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Melting range: 1300 – 1355°C
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Specific heat: 461 J/kg·K
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Thermal conductivity (20°C): 11.72 W/m·K
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Electrical resistivity (20°C): 115 µΩ·cm
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Young’s modulus: 224 GPa (at 20°C)
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Thermal expansion (20-1000°C): 10.3–18.9 ×10⁻⁶ /°C
Heat treatments
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Solution treatment: 1150°C for 2h (bars) or 3–10 min (sheet), with rapid cooling (WQ or FBQ)
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Aging: 800°C for 8h with air cooling
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Interstage: 1050–1100°C for 15 min to eliminate work hardening
Available forms
NIMONIC® Alloy 263 is available in:
Industrial applications
Thanks to its excellent creep resistance, thermal fatigue resistance and weldability, NIMONIC® 263 is used in:
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Aerospace and Defence: Combustion chambers, turbine blades, structural rings.
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Power Generation: Components for gas turbines and engines.
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Chemical and Pharmaceutical Industry: Components subject to cyclic heat and corrosion.
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Motorsport: Exhausts and manifolds in high-temperature environments.
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Nuclear: High-integrity components exposed to heat and radiation.
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Oil & Gas: Structural parts resistant to oxidation and fatigue.
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