UNS N08221 Nickel Alloy
N08221 nickel is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. It has a moderately low base cost among wrought nickels. In addition, it has a moderately low tensile strength and a moderately low embodied energy.
The graph bars on the material properties cards below compare N08221 nickel 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
190 MPa 28 x 103 psi
Poisson's Ratio
0.28
Shear Modulus
79 GPa 11 x 106 psi
Shear Strength
410 MPa 59 x 103 psi
Tensile Strength: Ultimate (UTS)
610 MPa 89 x 103 psi
Tensile Strength: Yield (Proof)
270 MPa 39 x 103 psi
Thermal Properties
Latent Heat of Fusion
310 J/g
Maximum Temperature: Mechanical
980 °C 1800 °F
Melting Completion (Liquidus)
1440 °C 2620 °F
Melting Onset (Solidus)
1390 °C 2530 °F
Specific Heat Capacity
460 J/kg-K 0.11 BTU/lb-°F
Thermal Expansion
13 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
44 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
7.9 kg CO2/kg material
Embodied Energy
110 MJ/kg 47 x 103 BTU/lb
Embodied Water
240 L/kg 29 gal/lb
Common Calculations
PREN (Pitting Resistance)
40
Resilience: Ultimate (Unit Rupture Work)
170 MJ/m3
Resilience: Unit (Modulus of Resilience)
170 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
21 points
Strength to Weight: Bending
19 points
Thermal Shock Resistance
16 points
Alloy Composition
| Ni | 39 to 46 | |
| Fe | 22 to 33.9 | |
| Cr | 20 to 22 | |
| Mo | 5.0 to 6.5 | |
| Cu | 1.5 to 3.0 | |
| Ti | 0.6 to 1.0 | |
| Mn | 0 to 1.0 | |
| Al | 0 to 0.2 | |
| Si | 0 to 0.050 | |
| S | 0 to 0.030 | |
| C | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B423: Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221) Seamless Pipe and Tube
ASTM B424: Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221) Plate, Sheet, and Strip
ASTM B425: Standard Specification for Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221) Rod and Bar
Welding Metallurgy and Weldability of Nickel-Base Alloys, John C. Lippold et al., 2009
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