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R30006 Cobalt vs. Nickel 686

R30006 cobalt belongs to the cobalt alloys classification, while nickel 686 belongs to the nickel alloys. They have a modest 28% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 1.0
51
Fatigue Strength, MPa 260
410
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 900
780
Tensile Strength: Yield (Proof), MPa 540
350

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1290
1340
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 15
9.8
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
1.4

Otherwise Unclassified Properties

Density, g/cm3 8.6
9.0
Embodied Carbon, kg CO2/kg material 7.8
12
Embodied Energy, MJ/kg 110
170
Embodied Water, L/kg 500
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
320
Resilience: Unit (Modulus of Resilience), kJ/m3 670
280
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 24
21
Thermal Diffusivity, mm2/s 3.9
2.6
Thermal Shock Resistance, points 26
21

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.010
Chromium (Cr), % 27 to 32
19 to 23
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
0 to 5.0
Manganese (Mn), % 0
0 to 0.75
Molybdenum (Mo), % 0 to 1.0
15 to 17
Nickel (Ni), % 0 to 3.0
49.5 to 63
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 0.080
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 4.0 to 6.0
3.0 to 4.4