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Nickel 718 vs. R30001 Cobalt

Nickel 718 belongs to the nickel alloys classification, while R30001 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is nickel 718 and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 12 to 50
1.0
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 40
55
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 930 to 1530
620

Thermal Properties

Latent Heat of Fusion, J/g 310
310
Melting Completion (Liquidus), °C 1340
1530
Melting Onset (Solidus), °C 1260
1260
Specific Heat Capacity, J/kg-K 450
430
Thermal Conductivity, W/m-K 11
15
Thermal Expansion, µm/m-K 13
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.3
9.0
Embodied Carbon, kg CO2/kg material 13
8.9
Embodied Energy, MJ/kg 190
130
Embodied Water, L/kg 250
460

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 31 to 51
19
Strength to Weight: Bending, points 25 to 35
18
Thermal Diffusivity, mm2/s 3.0
3.7
Thermal Shock Resistance, points 27 to 44
19

Alloy Composition

Aluminum (Al), % 0.2 to 0.8
0
Boron (B), % 0 to 0.0060
0
Carbon (C), % 0 to 0.080
2.0 to 3.0
Chromium (Cr), % 17 to 21
28 to 32
Cobalt (Co), % 0 to 1.0
43 to 59
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 11.1 to 24.6
0 to 3.0
Manganese (Mn), % 0 to 0.35
0
Molybdenum (Mo), % 2.8 to 3.3
0 to 1.0
Nickel (Ni), % 50 to 55
0 to 3.0
Niobium (Nb), % 4.8 to 5.5
0
Phosphorus (P), % 0 to 0.015
0
Silicon (Si), % 0 to 0.35
0 to 2.0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0.65 to 1.2
0
Tungsten (W), % 0
11 to 13