R31538 Cobalt vs. C23400 Brass

R31538 cobalt belongs to the cobalt alloys classification, while C23400 brass belongs to the copper alloys. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is C23400 brass.

High Carbon Co-28Cr-6Mo Alloy (ASTM F1537 Alloy 2, ISO 5832-12 Alloy 2, R31538)UNS C23400 Red Brass

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		110

Poisson's Ratio		0.29
Poisson's Ratio		0.32

Shear Modulus, GPa		86
Shear Modulus, GPa		42

Tensile Strength: Ultimate (UTS), MPa		1020 to 1360
Tensile Strength: Ultimate (UTS), MPa		370 to 640

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		190

Melting Completion (Liquidus), °C		1360
Melting Completion (Liquidus), °C		970

Melting Onset (Solidus), °C		1290
Melting Onset (Solidus), °C		930

Specific Heat Capacity, J/kg-K		450
Specific Heat Capacity, J/kg-K		390

Thermal Conductivity, W/m-K		13
Thermal Conductivity, W/m-K		120

Thermal Expansion, µm/m-K		13
Thermal Expansion, µm/m-K		19

Otherwise Unclassified Properties

Density, g/cm³		8.4
Density, g/cm³		8.5

Embodied Carbon, kg CO₂/kg material		8.1
Embodied Carbon, kg CO₂/kg material		2.6

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		43

Embodied Water, L/kg		530
Embodied Water, L/kg		320

Common Calculations

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		7.2

Stiffness to Weight: Bending, points		24
Stiffness to Weight: Bending, points		19

Strength to Weight: Axial, points		34 to 45
Strength to Weight: Axial, points		12 to 21

Strength to Weight: Bending, points		27 to 32
Strength to Weight: Bending, points		13 to 19

Thermal Diffusivity, mm²/s		3.5
Thermal Diffusivity, mm²/s		36

Thermal Shock Resistance, points		25 to 33
Thermal Shock Resistance, points		12 to 22

Alloy Composition

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

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

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

Copper (Cu), %		0
Copper (Cu), %		81 to 84

Iron (Fe), %		0 to 0.75
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0
Lead (Pb), %		0 to 0.050

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

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

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

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

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

Zinc (Zn), %		0
Zinc (Zn), %		15.7 to 19

Residuals, %		0
Residuals, %		0 to 0.2