Alloy K 500 MONEL® K 500 – W. Nr. 2.4375 / UNS N05500 / ASTM B865
Alloy K 500 MONEL® K 500
Alloy K 500 MONEL® K 500 is a nickel-copper alloy that combines the excellent corrosion resistance of MONEL® 400 with increased mechanical strength and hardness. These superior properties are achieved through the addition of aluminum and titanium and by a precipitation hardening heat treatment (aging), which promotes the formation of sub-microscopic Ni₃(Ti,Al) particles.
The alloy is widely used for components exposed to marine and chemical environments and is particularly valued for its resistance to oxidation, corrosion, and chloride stress corrosion cracking. It is ideal for applications such as chains, cables, springs, valves, pumps, drive shafts, drilling tool components, and electronic sensors.
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Reference standards:
- ASTM B865 (bars and forgings)
- NACE MR0175 (Oil & Gas)
- ISO 9723, ISO 9724, ISO 9725
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) + Cobalt (Co) | 63.0 min |
| Copper (Cu) | 27.0 – 33.0 |
| Aluminum (Al) | 2.3 – 3.15 |
| Titanium (Ti) | 0.35 – 0.85 |
| Iron (Fe) | 2.0 max |
| Manganese (Mn) | 1.5 max |
| Carbon (C) | 0.25 max |
| Silicon (Si) | 0.5 max |
| Sulfur (S) | 0.01 max |
Mechanical properties
| Form and Condition | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) | Hardness (Rockwell C) |
|---|---|---|---|---|
| Bars, Forgings, Aged | 965 – 1310 | 690 – 1034 | 30 – 20 | 24 – 41 |
| Bars, Forgings, Annealed | 621 – 758 | 276 – 414 | 50 – 25 | 75 – 90 (Rockwell B) |
| Wires, Annealed and Aged | 827 – 1034 | 621 – 758 | 30 – 15 | – |
| Sheets, Annealed and Aged | 896 – 1172 | 621 – 827 | 25 – 15 | 24 min. |
Heat treatments
- Solution Annealing: 1800°F (982°C) for hot-worked products and 1900°F (1038°C) for cold-worked products, followed by water quenching to prevent the formation of secondary phases.
- Aging:
- 1100°F (593°C) for 16 hours, followed by furnace cooling to 900°F (482°C).
- Alternatively, treatment at 1000°F (538°C) for 6 hours, with gradual cooling.
- Process Annealing: Performed at 1400°-1600°F to relieve internal stresses during processing.
Available forms
MONEL® Alloy K 500 is available in the following forms:
Industrial applications
Thanks to its exceptional combination of mechanical strength and corrosion resistance, MONEL® K 500 is ideal for:
- Aerospace and Defense: Components for marine and high-pressure environments.
- Power Generation: Drive shafts for turbines and high-pressure pumps.
- Chemical and Pharmaceutical Industry: Pumps and valves for aggressive chemical processing.
- Motorsport: High-precision components for high-performance vehicles.
- Nuclear: Components for high-temperature and high-pressure treatment plants.
- Oil & Gas: Pump parts, safety valves, pipes, and instrumentation for corrosive environments.
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