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Grade 365 Molybdenum vs. R30021 Cobalt

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R30021 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 365 molybdenum and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
220
Elongation at Break, % 6.3
9.0
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 120
86
Tensile Strength: Ultimate (UTS), MPa 620
700
Tensile Strength: Yield (Proof), MPa 530
500

Thermal Properties

Latent Heat of Fusion, J/g 370
330
Specific Heat Capacity, J/kg-K 250
450
Thermal Expansion, µm/m-K 7.0
11

Otherwise Unclassified Properties

Density, g/cm3 10
8.4
Embodied Carbon, kg CO2/kg material 28
8.0
Embodied Energy, MJ/kg 330
110
Embodied Water, L/kg 360
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
57
Resilience: Unit (Modulus of Resilience), kJ/m3 450
570
Stiffness to Weight: Axial, points 17
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 17
23
Strength to Weight: Bending, points 16
21
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0 to 0.010
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 0 to 0.010
0 to 3.0
Molybdenum (Mo), % 99.9 to 100
4.5 to 6.0
Nickel (Ni), % 0 to 0.0020
2.0 to 3.0
Nitrogen (N), % 0 to 0.0020
0
Oxygen (O), % 0 to 0.0015
0
Silicon (Si), % 0 to 0.010
0 to 1.5