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R30605 Cobalt vs. Nickel 718

R30605 cobalt belongs to the cobalt alloys classification, while nickel 718 belongs to the nickel alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
12 to 50
Fatigue Strength, MPa 260 to 590
460 to 760
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
930 to 1530
Tensile Strength: Yield (Proof), MPa 470 to 1600
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 290
310
Melting Completion (Liquidus), °C 1410
1340
Melting Onset (Solidus), °C 1330
1260
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 9.6
11
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
1.5

Otherwise Unclassified Properties

Density, g/cm3 9.6
8.3
Embodied Carbon, kg CO2/kg material 9.8
13
Embodied Energy, MJ/kg 140
190
Embodied Water, L/kg 450
250

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 33 to 55
31 to 51
Strength to Weight: Bending, points 25 to 36
25 to 35
Thermal Diffusivity, mm2/s 2.5
3.0
Thermal Shock Resistance, points 31 to 52
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0.050 to 0.15
0 to 0.080
Chromium (Cr), % 19 to 21
17 to 21
Cobalt (Co), % 46.4 to 57
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 3.0
11.1 to 24.6
Manganese (Mn), % 1.0 to 2.0
0 to 0.35
Molybdenum (Mo), % 0
2.8 to 3.3
Nickel (Ni), % 9.0 to 11
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.4
0 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2
Tungsten (W), % 14 to 16
0