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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

Nickel (Ni) 49.5 to 63
Chromium (Cr) 19 to 23
Molybdenum (Mo) 15 to 17
Tungsten (W) 3.0 to 4.4
Iron (Fe) 0 to 5.0
Manganese (Mn) 0 to 0.75
Titanium (Ti) 0.020 to 0.25
Silicon (Si) 0 to 0.080
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.020
Carbon (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