Monel K-500 (NiCu30Al, 2.4375, N05500, NA18)
Monel K-500 is a nickel alloy formulated for primary forming into wrought products. 2.4375 is the EN numeric designation for this material. NiCu30Al is the EN chemical designation. NA18 is the British Standard (BS) designation. N05500 is the UNS number. Monel K-500 is the common industry name. Additionally, the AFNOR (French) designation is NU30AT.
The properties of Monel K-500 include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare Monel K-500 to: wrought nickels (top), all nickel alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
160 GPa 23 x 106 psi
Elongation at Break
25 to 36 %
Fatigue Strength
260 to 560 MPa 38 to 81 x 103 psi
Poisson's Ratio
0.32
Shear Modulus
61 GPa 8.8 x 106 psi
Shear Strength
430 to 700 MPa 62 to 100 x 103 psi
Tensile Strength: Ultimate (UTS)
640 to 1100 MPa 93 to 160 x 103 psi
Tensile Strength: Yield (Proof)
310 to 880 MPa 45 to 130 x 103 psi
Thermal Properties
Curie Temperature
-67 °C -89 °F
Latent Heat of Fusion
270 J/g
Maximum Temperature: Mechanical
900 °C 1650 °F
Melting Completion (Liquidus)
1350 °C 2460 °F
Melting Onset (Solidus)
1320 °C 2400 °F
Specific Heat Capacity
440 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
18 W/m-K 11 BTU/h-ft-°F
Thermal Expansion
14 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
50 % relative
Calomel Potential
-100 mV
Density
8.7 g/cm3 540 lb/ft3
Embodied Carbon
8.1 kg CO2/kg material
Embodied Energy
120 MJ/kg 50 x 103 BTU/lb
Embodied Water
280 L/kg 33 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
180 to 260 MJ/m3
Resilience: Unit (Modulus of Resilience)
300 to 2420 kJ/m3
Stiffness to Weight: Axial
10 points
Stiffness to Weight: Bending
21 points
Strength to Weight: Axial
21 to 35 points
Strength to Weight: Bending
19 to 27 points
Thermal Diffusivity
4.8 mm2/s
Thermal Shock Resistance
21 to 36 points
Alloy Composition
| Ni | 63 to 70.4 | |
| Cu | 27 to 33 | |
| Al | 2.3 to 3.2 | |
| Fe | 0 to 2.0 | |
| Mn | 0 to 1.5 | |
| Ti | 0.35 to 0.85 | |
| Si | 0 to 0.5 | |
| C | 0 to 0.18 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000
Machining of Stainless Steels and Super Alloys: Traditional and Nontraditional Techniques, Helmi A. Youssef, 2016
Engineering Properties of Nickel and Nickel Alloys, John L. Everhart, 1971
Nickel Alloys, Ulrich Heubner (editor), 1998