Nickel Alloy 908 (N09908)
Nickel 908 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. N09908 is the UNS number for this material. Nickel Alloy 908 is the common industry name.
It has a moderately high tensile strength and a moderately low ductility among wrought nickels.
The graph bars on the material properties cards below compare nickel 908 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
180 GPa 27 x 106 psi
Elongation at Break
11 %
Fatigue Strength
450 MPa 65 x 103 psi
Poisson's Ratio
0.3
Shear Modulus
70 GPa 10 x 106 psi
Shear Strength
800 MPa 120 x 103 psi
Tensile Strength: Ultimate (UTS)
1340 MPa 190 x 103 psi
Tensile Strength: Yield (Proof)
930 MPa 130 x 103 psi
Thermal Properties
Latent Heat of Fusion
290 J/g
Maximum Temperature: Mechanical
920 °C 1680 °F
Melting Completion (Liquidus)
1430 °C 2610 °F
Melting Onset (Solidus)
1380 °C 2520 °F
Specific Heat Capacity
460 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
11 W/m-K 6.4 BTU/h-ft-°F
Thermal Expansion
8.6 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
50 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
9.3 kg CO2/kg material
Embodied Energy
140 MJ/kg 58 x 103 BTU/lb
Embodied Water
170 L/kg 21 gal/lb
Common Calculations
PREN (Pitting Resistance)
4.2
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m3
Resilience: Unit (Modulus of Resilience)
2340 kJ/m3
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
45 points
Strength to Weight: Bending
33 points
Thermal Diffusivity
2.9 mm2/s
Thermal Shock Resistance
61 points
Alloy Composition
| Ni | 47 to 51 | |
| Fe | 35.6 to 44.6 | |
| Cr | 3.8 to 4.5 | |
| Nb | 2.7 to 3.3 | |
| Ti | 1.2 to 1.8 | |
| Al | 0.75 to 1.3 | |
| Mn | 0 to 1.0 | |
| Si | 0 to 0.5 | |
| Co | 0 to 0.5 | |
| Cu | 0 to 0.5 | |
| C | 0 to 0.030 | |
| P | 0 to 0.015 | |
| B | 0 to 0.012 | |
| S | 0 to 0.0050 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B872: Standard Specification for Precipitation-Hardening Nickel-Iron-Chromium-Columbium (Nb)-Titanium-Aluminum Alloy (UNS N09908) Plate, Sheet, and Strip
Welding Metallurgy and Weldability of Nickel-Base Alloys, John C. Lippold et al., 2009
Aerospace Materials, Brian Cantor et al. (editors), 2001
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