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Nickel 718 vs. R30075 Cobalt

Nickel 718 belongs to the nickel alloys classification, while R30075 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 nickel 718 and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210 to 250
Elongation at Break, % 12 to 50
12
Fatigue Strength, MPa 460 to 760
250 to 840
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34 to 64
20
Shear Modulus, GPa 75
82 to 98
Tensile Strength: Ultimate (UTS), MPa 930 to 1530
780 to 1280
Tensile Strength: Yield (Proof), MPa 510 to 1330
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 310
320
Melting Completion (Liquidus), °C 1340
1360
Melting Onset (Solidus), °C 1260
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 11
13
Thermal Expansion, µm/m-K 13
12

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 390
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 660 to 4560
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 23
24 to 25
Strength to Weight: Axial, points 31 to 51
26 to 42
Strength to Weight: Bending, points 25 to 35
22 to 31
Thermal Diffusivity, mm2/s 3.0
3.5
Thermal Shock Resistance, points 27 to 44
21 to 29

Alloy Composition

Aluminum (Al), % 0.2 to 0.8
0 to 0.1
Boron (B), % 0 to 0.0060
0 to 0.010
Carbon (C), % 0 to 0.080
0 to 0.35
Chromium (Cr), % 17 to 21
27 to 30
Cobalt (Co), % 0 to 1.0
58.7 to 68
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 11.1 to 24.6
0 to 0.75
Manganese (Mn), % 0 to 0.35
0 to 1.0
Molybdenum (Mo), % 2.8 to 3.3
5.0 to 7.0
Nickel (Ni), % 50 to 55
0 to 0.5
Niobium (Nb), % 4.8 to 5.5
0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.015
0 to 0.020
Silicon (Si), % 0 to 0.35
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.010
Titanium (Ti), % 0.65 to 1.2
0 to 0.1
Tungsten (W), % 0
0 to 0.2