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R30006 Cobalt vs. Nickel 725

R30006 cobalt belongs to the cobalt alloys classification, while nickel 725 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 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is nickel 725.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
34
Fatigue Strength, MPa 260
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
78
Tensile Strength: Ultimate (UTS), MPa 900
860
Tensile Strength: Yield (Proof), MPa 540
350

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1400
1340
Melting Onset (Solidus), °C 1290
1270
Specific Heat Capacity, J/kg-K 450
440
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
1.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.5
Embodied Carbon, kg CO2/kg material 7.8
13
Embodied Energy, MJ/kg 110
190
Embodied Water, L/kg 500
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
240
Resilience: Unit (Modulus of Resilience), kJ/m3 670
300
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 29
28
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 26
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
19 to 22.5
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
2.3 to 15.3
Manganese (Mn), % 0
0 to 0.35
Molybdenum (Mo), % 0 to 1.0
7.0 to 9.5
Nickel (Ni), % 0 to 3.0
55 to 59
Niobium (Nb), % 0
2.8 to 4.0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 2.0
0 to 0.2
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.7
Tungsten (W), % 4.0 to 6.0
0