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
0.29
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
Density
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
| Ni | 55 to 59 | |
| Cr | 19 to 22.5 | |
| Fe | 2.3 to 15.3 | |
| Mo | 7.0 to 9.5 | |
| Nb | 2.8 to 4.0 | |
| Ti | 1.0 to 1.7 | |
| Mn | 0 to 0.35 | |
| Al | 0 to 0.35 | |
| Si | 0 to 0.2 | |
| C | 0 to 0.030 | |
| P | 0 to 0.015 | |
| 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