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Nickel Alloy 684 (2.4983, N07500)

Nickel 684 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the aged (precipitation hardened) condition. 2.4983 is the EN numeric designation for this material. N07500 is the UNS number. And Nickel Alloy 684 is the common industry name.

It has a moderately low ductility among wrought nickels. In addition, it has a moderately high heat capacity and a moderately high tensile strength.

The graph bars on the material properties cards below compare nickel 684 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

Brinell Hardness


Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Elongation at Break

11 %

Fatigue Strength

390 MPa 56 x 103 psi

Poisson's Ratio


Reduction in Area

17 %

Shear Modulus

76 GPa 11 x 106 psi

Shear Strength

710 MPa 100 x 103 psi

Tensile Strength: Ultimate (UTS)

1190 MPa 170 x 103 psi

Tensile Strength: Yield (Proof)

800 MPa 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Maximum Temperature: Mechanical

1000 °C 1830 °F

Melting Completion (Liquidus)

1370 °C 2500 °F

Melting Onset (Solidus)

1320 °C 2420 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

75 % relative


8.3 g/cm3 520 lb/ft3

Embodied Carbon

10 kg CO2/kg material

Embodied Energy

140 MJ/kg 61 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

1610 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

30 points

Thermal Shock Resistance

34 points

Alloy Composition

Nickel (Ni)Ni 42.7 to 64
Chromium (Cr)Cr 15 to 20
Cobalt (Co)Co 13 to 20
Molybdenum (Mo)Mo 3.0 to 5.0
Aluminum (Al)Al 2.5 to 3.3
Titanium (Ti)Ti 2.5 to 3.3
Iron (Fe)Fe 0 to 4.0
Manganese (Mn)Mn 0 to 0.75
Silicon (Si)Si 0 to 0.75
Carbon (C)C 0 to 0.15
Copper (Cu)Cu 0 to 0.15
Phosphorus (P)P 0 to 0.015
Sulfur (S)S 0 to 0.015
Boron (B)B 0.0030 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B637: Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock for High-Temperature Service

Microstructure of Superalloys, Madeleine Durand-Charre, 1998

Engineering Properties of Nickel and Nickel Alloys, John L. Everhart, 1971

Nickel Alloys, Ulrich Heubner (editor), 1998

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015