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Grade 365 Molybdenum vs. R30008 Cobalt

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R30008 cobalt belongs to the cobalt alloys. There are 19 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is grade 365 molybdenum and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
210
Elongation at Break, % 6.3
1.1 to 73
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 120
83
Tensile Strength: Ultimate (UTS), MPa 620
950 to 1700
Tensile Strength: Yield (Proof), MPa 530
500 to 1080

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
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 450
590 to 2720
Stiffness to Weight: Axial, points 17
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 17
31 to 56
Strength to Weight: Bending, points 16
25 to 37
Thermal Shock Resistance, points 21
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0 to 0.010
0 to 0.15
Chromium (Cr), % 0
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Iron (Fe), % 0 to 0.010
7.6 to 20
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 99.9 to 100
6.5 to 7.5
Nickel (Ni), % 0 to 0.0020
15 to 18
Nitrogen (N), % 0 to 0.0020
0
Oxygen (O), % 0 to 0.0015
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.010
0 to 1.2
Sulfur (S), % 0
0 to 0.015