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Grade 365 Molybdenum vs. R30816 Cobalt

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R30816 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 R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
210
Elongation at Break, % 6.3
23
Poisson's Ratio 0.31
0.3
Shear Modulus, GPa 120
81
Tensile Strength: Ultimate (UTS), MPa 620
1020
Tensile Strength: Yield (Proof), MPa 530
460

Thermal Properties

Latent Heat of Fusion, J/g 370
300
Specific Heat Capacity, J/kg-K 250
420
Thermal Expansion, µm/m-K 7.0
12

Otherwise Unclassified Properties

Density, g/cm3 10
9.1
Embodied Carbon, kg CO2/kg material 28
20
Embodied Energy, MJ/kg 330
320
Embodied Water, L/kg 360
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
190
Resilience: Unit (Modulus of Resilience), kJ/m3 450
510
Stiffness to Weight: Axial, points 17
13
Stiffness to Weight: Bending, points 22
22
Strength to Weight: Axial, points 17
31
Strength to Weight: Bending, points 16
25
Thermal Shock Resistance, points 21
28

Alloy Composition

Carbon (C), % 0 to 0.010
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Iron (Fe), % 0 to 0.010
0 to 5.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 99.9 to 100
3.5 to 4.5
Nickel (Ni), % 0 to 0.0020
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Nitrogen (N), % 0 to 0.0020
0
Oxygen (O), % 0 to 0.0015
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.010
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5