SAE-AISI A10 Steel vs. G-CoCr28 Cobalt

SAE-AISI A10 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 SAE-AISI A10 steel and the bottom bar is G-CoCr28 cobalt.

SAE-AISI A10 (T30110) Air-Hardening Steel G-CoCr28 (2.4778) Cobalt-Chromium Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		190
Elastic (Young's, Tensile) Modulus, GPa		210

Poisson's Ratio		0.29
Poisson's Ratio		0.28

Shear Modulus, GPa		72
Shear Modulus, GPa		83

Tensile Strength: Ultimate (UTS), MPa		810 to 2040
Tensile Strength: Ultimate (UTS), MPa		560

Thermal Properties

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

Melting Completion (Liquidus), °C		1440
Melting Completion (Liquidus), °C		1330

Melting Onset (Solidus), °C		1400
Melting Onset (Solidus), °C		1270

Specific Heat Capacity, J/kg-K		480
Specific Heat Capacity, J/kg-K		470

Thermal Conductivity, W/m-K		40
Thermal Conductivity, W/m-K		8.5

Thermal Expansion, µm/m-K		12
Thermal Expansion, µm/m-K		14

Otherwise Unclassified Properties

Base Metal Price, % relative		5.0
Base Metal Price, % relative		100

Density, g/cm³		7.8
Density, g/cm³		8.1

Embodied Carbon, kg CO₂/kg material		2.1
Embodied Carbon, kg CO₂/kg material		6.2

Embodied Energy, MJ/kg		27
Embodied Energy, MJ/kg		84

Embodied Water, L/kg		56
Embodied Water, L/kg		440

Common Calculations

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

Stiffness to Weight: Bending, points		25
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		29 to 73
Strength to Weight: Axial, points		19

Strength to Weight: Bending, points		25 to 46
Strength to Weight: Bending, points		19

Thermal Diffusivity, mm²/s		11
Thermal Diffusivity, mm²/s		2.2

Thermal Shock Resistance, points		27 to 68
Thermal Shock Resistance, points		14

Alloy Composition

Carbon (C), %		1.3 to 1.5
Carbon (C), %		0.050 to 0.25

Chromium (Cr), %		0
Chromium (Cr), %		27 to 30

Cobalt (Co), %		0
Cobalt (Co), %		48 to 52

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

Iron (Fe), %		90.8 to 93.4
Iron (Fe), %		9.7 to 24.5

Manganese (Mn), %		1.6 to 2.1
Manganese (Mn), %		0 to 1.5

Molybdenum (Mo), %		1.3 to 1.8
Molybdenum (Mo), %		0 to 0.5

Nickel (Ni), %		1.6 to 2.1
Nickel (Ni), %		0 to 4.0

Niobium (Nb), %		0
Niobium (Nb), %		0 to 0.5

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0 to 0.040

Silicon (Si), %		1.0 to 1.5
Silicon (Si), %		0.5 to 1.5

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