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R31538 Cobalt vs. Grade 364 Molybdenum

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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