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R31537 Cobalt vs. Nickel 718

R31537 cobalt belongs to the cobalt alloys classification, while nickel 718 belongs to the nickel alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 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 R31537 cobalt and the bottom bar is nickel 718.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 14 to 23
12 to 50
Fatigue Strength, MPa 310 to 480
460 to 760
Poisson's Ratio 0.29
0.29
Reduction in Area, % 13 to 23
34 to 64
Rockwell C Hardness 25 to 35
40
Shear Modulus, GPa 87
75
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
930 to 1530
Tensile Strength: Yield (Proof), MPa 590 to 940
510 to 1330

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1340
Melting Onset (Solidus), °C 1290
1260
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
11
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.3
Embodied Carbon, kg CO2/kg material 8.1
13
Embodied Energy, MJ/kg 110
190
Embodied Water, L/kg 530
250

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
140 to 390
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
660 to 4560
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33 to 44
31 to 51
Strength to Weight: Bending, points 26 to 32
25 to 35
Thermal Diffusivity, mm2/s 3.4
3.0
Thermal Shock Resistance, points 24 to 32
27 to 44

Alloy Composition

Aluminum (Al), % 0
0.2 to 0.8
Boron (B), % 0
0 to 0.0060
Carbon (C), % 0 to 0.14
0 to 0.080
Chromium (Cr), % 26 to 30
17 to 21
Cobalt (Co), % 58.9 to 69
0 to 1.0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 0 to 0.75
11.1 to 24.6
Manganese (Mn), % 0 to 1.0
0 to 0.35
Molybdenum (Mo), % 5.0 to 7.0
2.8 to 3.3
Nickel (Ni), % 0 to 1.0
50 to 55
Niobium (Nb), % 0
4.8 to 5.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.35
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.65 to 1.2