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Grade 364 Molybdenum vs. R31538 Cobalt

Grade 364 molybdenum belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 20 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 grade 364 molybdenum and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
220
Elongation at Break, % 6.2 to 11
13 to 23
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 120
86
Tensile Strength: Ultimate (UTS), MPa 580 to 720
1020 to 1360
Tensile Strength: Yield (Proof), MPa 350 to 620
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 370
320
Specific Heat Capacity, J/kg-K 250
450
Thermal Expansion, µm/m-K 7.0
13

Otherwise Unclassified Properties

Density, g/cm3 10
8.4
Embodied Carbon, kg CO2/kg material 28
8.1
Embodied Energy, MJ/kg 330
110
Embodied Water, L/kg 360
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 43 to 57
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 200 to 630
750 to 1920
Stiffness to Weight: Axial, points 17
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 16 to 20
34 to 45
Strength to Weight: Bending, points 15 to 17
27 to 32
Thermal Shock Resistance, points 19 to 24
25 to 33

Alloy Composition

Carbon (C), % 0.010 to 0.040
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 0 to 0.010
0 to 0.75
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 99.2 to 99.5
5.0 to 7.0
Nickel (Ni), % 0 to 0.0050
0 to 1.0
Nitrogen (N), % 0 to 0.0020
0 to 0.25
Oxygen (O), % 0 to 0.030
0
Silicon (Si), % 0 to 0.0050
0 to 1.0
Titanium (Ti), % 0.4 to 0.55
0
Zirconium (Zr), % 0.060 to 0.12
0