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Nickel 725 vs. R31233 Cobalt

Nickel 725 belongs to the nickel alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 38% 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 (6, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34
17
Fatigue Strength, MPa 260
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 860
1020
Tensile Strength: Yield (Proof), MPa 350
420

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1340
1350
Melting Onset (Solidus), °C 1270
1330
Specific Heat Capacity, J/kg-K 440
440
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.6
Embodied Carbon, kg CO2/kg material 13
8.4
Embodied Energy, MJ/kg 190
110
Embodied Water, L/kg 270
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
140
Resilience: Unit (Modulus of Resilience), kJ/m3 300
410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 28
33
Strength to Weight: Bending, points 24
26
Thermal Shock Resistance, points 23
25

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.030
0.020 to 0.1
Chromium (Cr), % 19 to 22.5
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 2.3 to 15.3
1.0 to 5.0
Manganese (Mn), % 0 to 0.35
0.1 to 1.5
Molybdenum (Mo), % 7.0 to 9.5
4.0 to 6.0
Nickel (Ni), % 55 to 59
7.0 to 11
Niobium (Nb), % 2.8 to 4.0
0
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.2
0.050 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.020
Titanium (Ti), % 1.0 to 1.7
0
Tungsten (W), % 0
1.0 to 3.0