G-CoCr28 Cobalt vs. AWS E308

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AWS E308 belongs to the iron alloys. They have 40% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is AWS E308.

G-CoCr28 (2.4778) Cobalt-Chromium Alloy AWS E308 (W30810) Weld Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		210
Elastic (Young's, Tensile) Modulus, GPa		200

Elongation at Break, %		6.7
Elongation at Break, %		40

Poisson's Ratio		0.28
Poisson's Ratio		0.28

Shear Modulus, GPa		83
Shear Modulus, GPa		78

Tensile Strength: Ultimate (UTS), MPa		560
Tensile Strength: Ultimate (UTS), MPa		620

Thermal Properties

Latent Heat of Fusion, J/g		320
Latent Heat of Fusion, J/g		290

Melting Completion (Liquidus), °C		1330
Melting Completion (Liquidus), °C		1420

Melting Onset (Solidus), °C		1270
Melting Onset (Solidus), °C		1380

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

Thermal Conductivity, W/m-K		8.5
Thermal Conductivity, W/m-K		16

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

Otherwise Unclassified Properties

Base Metal Price, % relative		100
Base Metal Price, % relative		16

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

Embodied Carbon, kg CO₂/kg material		6.2
Embodied Carbon, kg CO₂/kg material		3.2

Embodied Energy, MJ/kg		84
Embodied Energy, MJ/kg		46

Embodied Water, L/kg		440
Embodied Water, L/kg		150

Common Calculations

Stiffness to Weight: Axial, points		15
Stiffness to Weight: Axial, points		14

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

Strength to Weight: Axial, points		19
Strength to Weight: Axial, points		22

Strength to Weight: Bending, points		19
Strength to Weight: Bending, points		21

Thermal Diffusivity, mm²/s		2.2
Thermal Diffusivity, mm²/s		4.2

Thermal Shock Resistance, points		14
Thermal Shock Resistance, points		16

Alloy Composition

Carbon (C), %		0.050 to 0.25
Carbon (C), %		0 to 0.080

Chromium (Cr), %		27 to 30
Chromium (Cr), %		18 to 21

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

Copper (Cu), %		0
Copper (Cu), %		0 to 0.75

Iron (Fe), %		9.7 to 24.5
Iron (Fe), %		62.9 to 72.5

Manganese (Mn), %		0 to 1.5
Manganese (Mn), %		0.5 to 2.5

Molybdenum (Mo), %		0 to 0.5
Molybdenum (Mo), %		0 to 0.75

Nickel (Ni), %		0 to 4.0
Nickel (Ni), %		9.0 to 11

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

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

Silicon (Si), %		0.5 to 1.5
Silicon (Si), %		0 to 1.0

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