EN 2.4964 Cobalt vs. SAE-AISI H23 Steel

EN 2.4964 cobalt belongs to the cobalt alloys classification, while SAE-AISI H23 steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. 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 EN 2.4964 cobalt and the bottom bar is SAE-AISI H23 steel.

EN 2.4964 (CoCr20W15Ni) Cobalt Alloy SAE-AISI H23 (T20823) Tungsten Hot-Work Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		220
Elastic (Young's, Tensile) Modulus, GPa		200

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		86
Shear Modulus, GPa		80

Tensile Strength: Ultimate (UTS), MPa		960
Tensile Strength: Ultimate (UTS), MPa		760 to 1550

Thermal Properties

Latent Heat of Fusion, J/g		290
Latent Heat of Fusion, J/g		260

Melting Completion (Liquidus), °C		1630
Melting Completion (Liquidus), °C		1680

Melting Onset (Solidus), °C		1550
Melting Onset (Solidus), °C		1630

Specific Heat Capacity, J/kg-K		400
Specific Heat Capacity, J/kg-K		440

Thermal Conductivity, W/m-K		15
Thermal Conductivity, W/m-K		20

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

Otherwise Unclassified Properties

Density, g/cm³		9.6
Density, g/cm³		8.7

Embodied Carbon, kg CO₂/kg material		9.8
Embodied Carbon, kg CO₂/kg material		6.9

Embodied Energy, MJ/kg		140
Embodied Energy, MJ/kg		110

Embodied Water, L/kg		450
Embodied Water, L/kg		120

Common Calculations

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

Stiffness to Weight: Bending, points		21
Stiffness to Weight: Bending, points		22

Strength to Weight: Axial, points		28
Strength to Weight: Axial, points		24 to 49

Strength to Weight: Bending, points		23
Strength to Weight: Bending, points		21 to 34

Thermal Diffusivity, mm²/s		3.9
Thermal Diffusivity, mm²/s		5.2

Thermal Shock Resistance, points		25
Thermal Shock Resistance, points		23 to 47

Alloy Composition

Carbon (C), %		0.050 to 0.15
Carbon (C), %		0.25 to 0.35

Chromium (Cr), %		19 to 21
Chromium (Cr), %		11 to 12.8

Cobalt (Co), %		46.4 to 58
Cobalt (Co), %		0

Copper (Cu), %		0
Copper (Cu), %		0 to 0.25

Iron (Fe), %		0 to 3.0
Iron (Fe), %		71.3 to 76.7

Manganese (Mn), %		0 to 2.0
Manganese (Mn), %		0.15 to 0.4

Nickel (Ni), %		9.0 to 11
Nickel (Ni), %		0 to 0.3

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0 to 0.4
Silicon (Si), %		0.15 to 0.6

Sulfur (S), %		0 to 0.015
Sulfur (S), %		0 to 0.030

Tungsten (W), %		14 to 16
Tungsten (W), %		11 to 12.8

Vanadium (V), %		0
Vanadium (V), %		0.75 to 1.3