Menu (ESC)

Nickel Alloy 725 (N07725)

Nickel 725 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. N07725 is the UNS number for this material. Nickel Alloy 725 is the common industry name.

It has a moderately low melting temperature and a moderately high embodied energy among wrought nickels.

The graph bars on the material properties cards below compare nickel 725 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

200 GPa 29 x 106 psi

Elongation at Break

34 %

Fatigue Strength

260 MPa 37 x 103 psi

Poisson's Ratio


Reduction in Area

45 %

Shear Modulus

78 GPa 11 x 106 psi

Shear Strength

580 MPa 84 x 103 psi

Tensile Strength: Ultimate (UTS)

860 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

350 MPa 50 x 103 psi

Thermal Properties

Latent Heat of Fusion

320 J/g

Maximum Temperature: Mechanical

980 °C 1800 °F

Melting Completion (Liquidus)

1340 °C 2450 °F

Melting Onset (Solidus)

1270 °C 2320 °F

Specific Heat Capacity

440 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

75 % relative


8.5 g/cm3 530 lb/ft3

Embodied Carbon

13 kg CO2/kg material

Embodied Energy

190 MJ/kg 80 x 103 BTU/lb

Embodied Water

270 L/kg 33 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

240 MJ/m3

Resilience: Unit (Modulus of Resilience)

300 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

28 points

Strength to Weight: Bending

24 points

Thermal Shock Resistance

23 points

Alloy Composition

Nickel (Ni)Ni 55 to 59
Chromium (Cr)Cr 19 to 22.5
Iron (Fe)Fe 2.3 to 15.3
Molybdenum (Mo)Mo 7.0 to 9.5
Niobium (Nb)Nb 2.8 to 4.0
Titanium (Ti)Ti 1.0 to 1.7
Manganese (Mn)Mn 0 to 0.35
Aluminum (Al)Al 0 to 0.35
Silicon (Si)Si 0 to 0.2
Carbon (C)C 0 to 0.030
Phosphorus (P)P 0 to 0.015
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

ASTM B805: Standard Specification for Precipitation Hardening Nickel Alloys UNS N07716, N07725, N07773, N07776, and N09777, Bar and Wire

Microstructure of Superalloys, Madeleine Durand-Charre, 1998

ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000

Aerospace Materials, Brian Cantor et al. (editors), 2001

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

Nickel Alloys, Ulrich Heubner (editor), 1998