Annealed R31538 Cobalt vs. Annealed K93050 Alloy

Annealed R31538 cobalt belongs to the cobalt alloys classification, while annealed K93050 alloy belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is annealed R31538 cobalt and the bottom bar is annealed K93050 alloy.

Annealed High Carbon Co-28Cr-6Mo Alloy Temper A (Annealed) K93050 Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		190

Poisson's Ratio		0.29
Poisson's Ratio		0.3

Shear Modulus, GPa		86
Shear Modulus, GPa		72

Tensile Strength: Ultimate (UTS), MPa		1020
Tensile Strength: Ultimate (UTS), MPa		500

Tensile Strength: Yield (Proof), MPa		580
Tensile Strength: Yield (Proof), MPa		300

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		270

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		1430

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		1380

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		460

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		12

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		8.2

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		4.7

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		65

Embodied Water, L/kg		530
Embodied Water, L/kg		120

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m³		750
Resilience: Unit (Modulus of Resilience), kJ/m³		240

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		34
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		27
Strength to Weight: Bending, points		17

Thermal Shock Resistance, points		25
Thermal Shock Resistance, points		16

Alloy Composition

Carbon (C), %		0.15 to 0.35
Carbon (C), %		0 to 0.15

Chromium (Cr), %		26 to 30
Chromium (Cr), %		0 to 0.25

Cobalt (Co), %		58.7 to 68.9
Cobalt (Co), %		0 to 0.5

Iron (Fe), %		0 to 0.75
Iron (Fe), %		61.4 to 63.9

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

Molybdenum (Mo), %		5.0 to 7.0
Molybdenum (Mo), %		0

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		36

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.020

Selenium (Se), %		0
Selenium (Se), %		0.15 to 0.3

Silicon (Si), %		0 to 1.0
Silicon (Si), %		0 to 0.35

Sulfur (S), %		0
Sulfur (S), %		0 to 0.020