Nickel Alloy 686 (2.4606, N06686)
Nickel 686 is a nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 2.4606 is the EN numeric designation for this material. N06686 is the UNS number. And Nickel Alloy 686 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 high ductility and a moderately low heat capacity among wrought nickels.
The graph bars on the material properties cards below compare nickel 686 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
220 GPa 32 x 106 psi
Elongation at Break
51 %
Fatigue Strength
410 MPa 59 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
77 GPa 11 x 106 psi
Shear Strength
560 MPa 81 x 103 psi
Tensile Strength: Ultimate (UTS)
780 MPa 110 x 103 psi
Tensile Strength: Yield (Proof)
350 MPa 51 x 103 psi
Thermal Properties
Latent Heat of Fusion
320 J/g
Maximum Temperature: Mechanical
980 °C 1800 °F
Melting Completion (Liquidus)
1380 °C 2520 °F
Melting Onset (Solidus)
1340 °C 2440 °F
Specific Heat Capacity
420 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
9.8 W/m-K 5.7 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
1.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
1.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
70 % relative
Density
9.0 g/cm3 560 lb/ft3
Embodied Carbon
12 kg CO2/kg material
Embodied Energy
170 MJ/kg 72 x 103 BTU/lb
Embodied Water
300 L/kg 35 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
320 MJ/m3
Resilience: Unit (Modulus of Resilience)
280 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
22 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
2.6 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
| Ni | 49.5 to 63 | |
| Cr | 19 to 23 | |
| Mo | 15 to 17 | |
| W | 3.0 to 4.4 | |
| Fe | 0 to 5.0 | |
| Mn | 0 to 0.75 | |
| Ti | 0.020 to 0.25 | |
| Si | 0 to 0.080 | |
| P | 0 to 0.040 | |
| S | 0 to 0.020 | |
| C | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B574: Standard Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Molybdenum-Chromium-Tantalum, Low-Carbon Nickel-Chromium-Molybdenum-Copper, and Low-Carbon Nickel-Chromium-Molybdenum-Tungsten Alloy Rod
ASTM B575: Standard Specification for Low-Carbon Nickel-Chromium-Molybdenum, Low-Carbon Nickel-Chromium-Molybdenum-Copper, Low-Carbon Nickel- Chromium-Molybdenum-Tantalum, and Low-Carbon Nickel- Chromium-Molybdenum-Tungsten Alloy Plate, Sheet, and Strip
ASTM B462: Standard Specification for Forged or Rolled UNS N06030, UNS N06022, UNS N06035, UNS N06200, UNS N06059, UNS N06686, UNS N08020, UNS N08024, UNS N08026, UNS N08367, UNS N10276, UNS N10665, UNS N10675, UNS N10629, UNS N08031, UNS N06045, UNS N06025, and UNS R20033 Alloy Pipe Flanges, Forged Fittings, and Valves and Parts for Corrosive High-Temperature Service
ASTM B619: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe
ASTM B626: Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Tube
ASTM B622: Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube
ASTM B564: Standard Specification for Nickel Alloy Forgings
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