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Nickel 617 vs. R31538 Cobalt

Nickel 617 belongs to the nickel alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have 42% of their average alloy composition in common. There are 27 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 nickel 617 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 40
13 to 23
Fatigue Strength, MPa 220
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 740
1020 to 1360
Tensile Strength: Yield (Proof), MPa 280
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1330
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 12
13

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 8.5
8.4
Embodied Carbon, kg CO2/kg material 10
8.1
Embodied Energy, MJ/kg 140
110
Embodied Water, L/kg 350
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 190
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 24
34 to 45
Strength to Weight: Bending, points 21
27 to 32
Thermal Diffusivity, mm2/s 3.5
3.5
Thermal Shock Resistance, points 21
25 to 33

Alloy Composition

Aluminum (Al), % 0.8 to 1.5
0
Boron (B), % 0 to 0.0060
0
Carbon (C), % 0.050 to 0.15
0.15 to 0.35
Chromium (Cr), % 20 to 24
26 to 30
Cobalt (Co), % 10 to 15
58.7 to 68.9
Copper (Cu), % 0 to 0.5
0
Iron (Fe), % 0 to 3.0
0 to 0.75
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 8.0 to 10
5.0 to 7.0
Nickel (Ni), % 44.5 to 62
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0