Grade 361 Molybdenum vs. R31537 Cobalt

Grade 361 molybdenum belongs to the otherwise unclassified metals classification, while R31537 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 361 molybdenum and the bottom bar is R31537 cobalt.

Grade 361 Molybdenum Low Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 1, ISO 5832-12 Alloy 1, R31537)

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		310
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		6.3
Elongation at Break, %		14 to 23

Poisson's Ratio		0.31
Poisson's Ratio		0.29

Shear Modulus, GPa		120
Shear Modulus, GPa		87

Tensile Strength: Ultimate (UTS), MPa		620
Tensile Strength: Ultimate (UTS), MPa		1000 to 1340

Tensile Strength: Yield (Proof), MPa		530
Tensile Strength: Yield (Proof), MPa		590 to 940

Thermal Properties

Latent Heat of Fusion, J/g		370
Latent Heat of Fusion, J/g		320

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

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

Otherwise Unclassified Properties

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

Embodied Carbon, kg CO₂/kg material		28
Embodied Carbon, kg CO₂/kg material		8.1

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

Embodied Water, L/kg		360
Embodied Water, L/kg		530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		37
Resilience: Ultimate (Unit Rupture Work), MJ/m³		140 to 200

Resilience: Unit (Modulus of Resilience), kJ/m³		450
Resilience: Unit (Modulus of Resilience), kJ/m³		780 to 1990

Stiffness to Weight: Axial, points		17
Stiffness to Weight: Axial, points		15

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

Strength to Weight: Axial, points		17
Strength to Weight: Axial, points		33 to 44

Strength to Weight: Bending, points		16
Strength to Weight: Bending, points		26 to 32

Thermal Shock Resistance, points		21
Thermal Shock Resistance, points		24 to 32

Alloy Composition

Carbon (C), %		0 to 0.010
Carbon (C), %		0 to 0.14

Chromium (Cr), %		0
Chromium (Cr), %		26 to 30

Cobalt (Co), %		0
Cobalt (Co), %		58.9 to 69

Iron (Fe), %		0 to 0.010
Iron (Fe), %		0 to 0.75

Manganese (Mn), %		0
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		99.9 to 100
Molybdenum (Mo), %		5.0 to 7.0

Nickel (Ni), %		0 to 0.0050
Nickel (Ni), %		0 to 1.0

Nitrogen (N), %		0 to 0.0020
Nitrogen (N), %		0 to 0.25

Oxygen (O), %		0 to 0.0070
Oxygen (O), %		0

Silicon (Si), %		0 to 0.010
Silicon (Si), %		0 to 1.0