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G-CoCr28 Cobalt vs. Grade CX2M Nickel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while grade CX2M nickel belongs to the nickel alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is grade CX2M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 6.7
45
Fatigue Strength, MPa 130
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
84
Tensile Strength: Ultimate (UTS), MPa 560
550
Tensile Strength: Yield (Proof), MPa 260
310

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Maximum Temperature: Mechanical, °C 1200
990
Melting Completion (Liquidus), °C 1330
1500
Melting Onset (Solidus), °C 1270
1450
Specific Heat Capacity, J/kg-K 470
430
Thermal Conductivity, W/m-K 8.5
10
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 100
65
Density, g/cm3 8.1
8.7
Embodied Carbon, kg CO2/kg material 6.2
12
Embodied Energy, MJ/kg 84
160
Embodied Water, L/kg 440
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
210
Resilience: Unit (Modulus of Resilience), kJ/m3 160
220
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
17
Thermal Diffusivity, mm2/s 2.2
2.7
Thermal Shock Resistance, points 14
15

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.020
Chromium (Cr), % 27 to 30
22 to 24
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
0 to 1.5
Manganese (Mn), % 0 to 1.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
15 to 16.5
Nickel (Ni), % 0 to 4.0
56.4 to 63
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0.5 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.020