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Grade 365 Molybdenum vs. R30605 Cobalt

Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R30605 cobalt belongs to the cobalt alloys. There are 18 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 R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 310
210
Elongation at Break, % 6.3
34
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 120
81
Tensile Strength: Ultimate (UTS), MPa 620
1130 to 1900
Tensile Strength: Yield (Proof), MPa 530
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Specific Heat Capacity, J/kg-K 250
410
Thermal Expansion, µm/m-K 7.0
12

Otherwise Unclassified Properties

Density, g/cm3 10
9.6
Embodied Carbon, kg CO2/kg material 28
9.8
Embodied Energy, MJ/kg 330
140
Embodied Water, L/kg 360
450

Common Calculations

Stiffness to Weight: Axial, points 17
12
Stiffness to Weight: Bending, points 22
21
Strength to Weight: Axial, points 17
33 to 55
Strength to Weight: Bending, points 16
25 to 36
Thermal Shock Resistance, points 21
31 to 52

Alloy Composition

Carbon (C), % 0 to 0.010
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
46.4 to 57
Iron (Fe), % 0 to 0.010
0 to 3.0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 99.9 to 100
0
Nickel (Ni), % 0 to 0.0020
9.0 to 11
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 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16