's Technical Engineering Team for Pricing & Availability.
Monel K500 (Alloy K500 / DIN 2.4375) is a unique precipitation-hardenable nickel-copper alloy. It masterfully marries the exceptional corrosion resistance of Monel 400 with the enhanced physical advantages of high tensile strength, extreme hardness, and remarkable fatigue resistance.
Chemical Composition of Monel K500 (DIN 2.4375)
The base architecture of Monel K500 relies on a high-purity Nickel-Copper ratio, enhanced with trace elements that act as hardening agents during heat treatment.
| 63.0 min | 27.0 – 33.0 | 2.30 – 3.15 | 0.35 – 0.85 | 2.0 max | 1.5 max | 0.5 max | 0.25 max |
Mechanical Properties: The Age-Hardening Advantage
UNS N05500 is its mechanical performance. Compared to standard Monel 400, Monel K500 exhibits when fully age-hardened, while preserving excellent ductility and toughness across extreme temperature ranges.
>= 965 MPa (140 ksi) up to 1100 MPa (160 ksi) based on form and heat treatment.
0.2% Yield Strength (Rp0.2): >= 690 MPa (100 ksi) to 790 MPa (115 ksi)
Elongation (A5): >= 20% (retains high ductility even when hardened)
28 to 40 HRC (dependent on the cold work and aging cycles applied)
Monel K500 maintains its structural integrity down to cryogenic temperatures (tough down to -400℃F / -240℃). Additionally, it possesses remarkable resistance to corrosion fatigue and cavitation erosion in high-velocity fluid networks, making it the premier choice for rotary components.
8.44 g/cm³ (0.305 lb/in³)
1350℃ to 1400℃ (2400℃F to 2460℃F)
179 kN/mm² (26 x 10³ ksi)
Thermal Conductivity (20℃): 17.4 W/m·K
Magnetic Permeability (20℃): < 1.002 (Virtually non-magnetic)
-90℃ (-130℃F)
The corrosion dynamics of Monel K500 broadly match those of Monel 400. It offers outstanding defense against a vast array of corrosive environments:
- It showcases exceptionally low corrosion rates in high-velocity seawater, preventing the severe erosion-corrosion common in standard marine steels.
- Sour Gas Protection (H2S): Alloy K500 is highly resistant to hydrogen sulfide cracking. Standard testing consisting of 6 days of continuous immersion in saturated H2S solutions yields zero cracking, making it a reliable choice for downhole oil patch infrastructure.
- Resistant to non-oxidizing mineral acids, salts, alkalis, and organic acids.
Industrial Applications for Monel K500 Components
- Marine centrifugal pump shafts, impellers, and propeller assemblies.
- Oil-well drill collars, instrumentation housings, and downhole tools.
- Doctor blades, scrapers, and valve trims used in paper and chemical processing.
- Heavy-duty fasteners, springs, and marine chains.
