R30003 Cobalt vs. Grade 365 Molybdenum

R30003 cobalt belongs to the cobalt alloys classification, while grade 365 molybdenum belongs to the otherwise unclassified metals. There are 19 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 R30003 cobalt and the bottom bar is grade 365 molybdenum.

UNS R30003 (ASTM F1058 Grade 1) Alloy Grade 365 Molybdenum

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		210
Elastic (Young's, Tensile) Modulus, GPa		310

Elongation at Break, %		10 to 73
Elongation at Break, %		6.3

Poisson's Ratio		0.29
Poisson's Ratio		0.31

Shear Modulus, GPa		83
Shear Modulus, GPa		120

Tensile Strength: Ultimate (UTS), MPa		970 to 1720
Tensile Strength: Ultimate (UTS), MPa		620

Tensile Strength: Yield (Proof), MPa		510 to 1090
Tensile Strength: Yield (Proof), MPa		530

Thermal Properties

Latent Heat of Fusion, J/g		310
Latent Heat of Fusion, J/g		370

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		250

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		7.0

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		10

Embodied Carbon, kg CO₂/kg material		8.0
Embodied Carbon, kg CO₂/kg material		28

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		330

Embodied Water, L/kg		400
Embodied Water, L/kg		360

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m³		600 to 2790
Resilience: Unit (Modulus of Resilience), kJ/m³		450

Stiffness to Weight: Axial, points		14
Stiffness to Weight: Axial, points		17

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		22

Strength to Weight: Axial, points		32 to 57
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		26 to 38
Strength to Weight: Bending, points		16

Thermal Shock Resistance, points		26 to 45
Thermal Shock Resistance, points		21

Alloy Composition

Boron (B), %		0 to 0.1
Boron (B), %		0

Carbon (C), %		0 to 0.15
Carbon (C), %		0 to 0.010

Chromium (Cr), %		19 to 21
Chromium (Cr), %		0

Cobalt (Co), %		39 to 41
Cobalt (Co), %		0

Iron (Fe), %		10 to 20.5
Iron (Fe), %		0 to 0.010

Manganese (Mn), %		1.5 to 2.5
Manganese (Mn), %		0

Molybdenum (Mo), %		6.0 to 8.0
Molybdenum (Mo), %		99.9 to 100

Nickel (Ni), %		14 to 16
Nickel (Ni), %		0 to 0.0020

Nitrogen (N), %		0
Nitrogen (N), %		0 to 0.0020

Oxygen (O), %		0
Oxygen (O), %		0 to 0.0015

Phosphorus (P), %		0 to 0.015
Phosphorus (P), %		0

Silicon (Si), %		0 to 1.2
Silicon (Si), %		0 to 0.010

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0