Nickel Alloy 825 (2.4858, N08825, NA16)
Nickel 825 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 2.4858 is the EN numeric designation for this material. NA16 is the British Standard (BS) designation. N08825 is the UNS number. And Nickel Alloy 825 is the common industry name.
This material is well established: the Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.
It has a moderately low base cost among wrought nickels. In addition, it has a moderately low embodied energy and a moderately low tensile strength.
The graph bars on the material properties cards below compare nickel 825 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
78 GPa 11 x 106 psi
Shear Strength
430 MPa 63 x 103 psi
Tensile Strength: Ultimate (UTS)
650 MPa 94 x 103 psi
Tensile Strength: Yield (Proof)
260 MPa 38 x 103 psi
Thermal Properties
Curie Temperature
-200 °C -320 °F
Latent Heat of Fusion
300 J/g
Maximum Temperature: Mechanical
980 °C 1800 °F
Melting Completion (Liquidus)
1400 °C 2550 °F
Melting Onset (Solidus)
1370 °C 2500 °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
14 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
1.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
41 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
7.2 kg CO2/kg material
Embodied Energy
100 MJ/kg 43 x 103 BTU/lb
Embodied Water
230 L/kg 28 gal/lb
Common Calculations
PREN (Pitting Resistance)
31
Resilience: Ultimate (Unit Rupture Work)
180 MJ/m3
Resilience: Unit (Modulus of Resilience)
170 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
22 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
2.9 mm2/s
Thermal Shock Resistance
17 points
Alloy Composition
| Ni | 38 to 46 | |
| Fe | 22 to 37.9 | |
| Cr | 19.5 to 23.5 | |
| Mo | 2.5 to 3.5 | |
| Cu | 1.5 to 3.0 | |
| Ti | 0.6 to 1.2 | |
| Mn | 0 to 1.0 | |
| Al | 0 to 0.2 | |
| C | 0 to 0.050 | |
| Si | 0 to 0.050 | |
| S | 0 to 0.030 |
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
ASTM B704: Standard Specification for Welded UNS N06625, UNS N06219 and UNS N08825 Alloy Tubes
ASTM B705: Standard Specification for Nickel-Alloy (UNS N06625, N06219 and N08825) Welded Pipe
ASTM B564: Standard Specification for Nickel Alloy Forgings
Welding Metallurgy and Weldability of Nickel-Base Alloys, John C. Lippold et al., 2009
ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000
Engineering Properties of Nickel and Nickel Alloys, John L. Everhart, 1971
Nickel Alloys, Ulrich Heubner (editor), 1998