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Grade 365 Molybdenum vs. R31233 Cobalt

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R31233 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is grade 365 molybdenum and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
220
Elongation at Break, % 6.3
17
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 120
85
Tensile Strength: Ultimate (UTS), MPa 620
1020
Tensile Strength: Yield (Proof), MPa 530
420

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Specific Heat Capacity, J/kg-K 250
440
Thermal Expansion, µm/m-K 7.0
13

Otherwise Unclassified Properties

Density, g/cm3 10
8.6
Embodied Carbon, kg CO2/kg material 28
8.4
Embodied Energy, MJ/kg 330
110
Embodied Water, L/kg 360
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
140
Resilience: Unit (Modulus of Resilience), kJ/m3 450
410
Stiffness to Weight: Axial, points 17
14
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 17
33
Strength to Weight: Bending, points 16
26
Thermal Shock Resistance, points 21
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.010
0.020 to 0.1
Chromium (Cr), % 0
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 0 to 0.010
1.0 to 5.0
Manganese (Mn), % 0
0.1 to 1.5
Molybdenum (Mo), % 99.9 to 100
4.0 to 6.0
Nickel (Ni), % 0 to 0.0020
7.0 to 11
Nitrogen (N), % 0 to 0.0020
0.030 to 0.12
Oxygen (O), % 0 to 0.0015
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.010
0.050 to 1.0
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0