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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


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


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

Nickel (Ni)Ni 63 to 70.4
Copper (Cu)Cu 27 to 33
Aluminum (Al)Al 2.3 to 3.2
Iron (Fe)Fe 0 to 2.0
Manganese (Mn)Mn 0 to 1.5
Titanium (Ti)Ti 0.35 to 0.85
Silicon (Si)Si 0 to 0.5
Carbon (C)C 0 to 0.18
Sulfur (S)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