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R31539 Cobalt vs. 50Cr-50Ni Alloy

R31539 cobalt belongs to the cobalt alloys classification, while 50Cr-50Ni alloy belongs to the otherwise unclassified metals. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is 50Cr-50Ni alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 22
5.7
Poisson's Ratio 0.29
0.26
Shear Modulus, GPa 86
84
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
620
Tensile Strength: Yield (Proof), MPa 590 to 940
390

Thermal Properties

Latent Heat of Fusion, J/g 320
350
Specific Heat Capacity, J/kg-K 450
490
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.2
7.9
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
350

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
31
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
350
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
21
Strength to Weight: Bending, points 27 to 32
20
Thermal Shock Resistance, points 24 to 32
14

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0 to 0.25
Carbon (C), % 0 to 0.14
0 to 0.1
Chromium (Cr), % 26 to 30
48 to 52
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
0 to 1.0
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0 to 0.3
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
44.5 to 52
Nitrogen (N), % 0 to 0.25
0 to 0.3
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.5