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Nickel 686 vs. R30021 Cobalt

Nickel 686 belongs to the nickel alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is nickel 686 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 51
9.0
Fatigue Strength, MPa 410
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 780
700
Tensile Strength: Yield (Proof), MPa 350
500

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Melting Completion (Liquidus), °C 1380
1350
Melting Onset (Solidus), °C 1340
1190
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 9.8
15
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
2.1

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.4
Embodied Carbon, kg CO2/kg material 12
8.0
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 300
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
57
Resilience: Unit (Modulus of Resilience), kJ/m3 280
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24
23
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 2.6
3.8
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0 to 0.010
0.2 to 0.35
Chromium (Cr), % 19 to 23
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 0 to 5.0
0 to 3.0
Manganese (Mn), % 0 to 0.75
0
Molybdenum (Mo), % 15 to 17
4.5 to 6.0
Nickel (Ni), % 49.5 to 63
2.0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.080
0 to 1.5
Sulfur (S), % 0 to 0.020
0
Titanium (Ti), % 0.020 to 0.25
0
Tungsten (W), % 3.0 to 4.4
0