Monel K500 (UNS N05500) is a precipitation-hardened nickel-copper alloy known for its high strength and excellent corrosion resistance. Its hardness varies significantly depending on the heat treatment condition.
🔹 Monel K500 Hardness Values
| Condition | Hardness (Typical) | Hardness Scale |
|---|---|---|
| Annealed | ~ Rockwell B 90 | HRB |
| Age-Hardened (Aged) | Rockwell C 22 – 35 | HRC |
| Cold Worked + Aged | Rockwell C 35 – 45 | HRC |
✅ Note: The hardness increases significantly after age-hardening, due to precipitation of Ni₃(Al,Ti).
🔹 Factors Affecting Hardness
Heat Treatment: Aging at 960–980°F (516–527°C) for 8–16 hours increases hardness.
Cold Work: Cold deformation before aging enhances final hardness.
Grain Size & Composition: Minor variation depending on manufacturing method and purity.
🔹 Applications Where Hardness Matters
Monel K500's high hardness makes it ideal for:
Pump and valve parts under high wear
Oil & gas tools and shafts
Marine fasteners and springs
Aerospace components requiring strength and corrosion resistance
🔹 SSM Supplies
SSM can supply Monel K500 products in various hardness conditions:
Annealed (for machining)
Precipitation-Hardened (ready for high-strength applications)
Custom hardness by cold work and aging on request
