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G-CoCr28 Cobalt vs. AWS ER80S-B8

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AWS ER80S-B8 belongs to the iron alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is AWS ER80S-B8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 6.7
19
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 560
630
Tensile Strength: Yield (Proof), MPa 260
530

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1330
1460
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
26
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 100
6.5
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
2.0
Embodied Energy, MJ/kg 84
28
Embodied Water, L/kg 440
89

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
120
Resilience: Unit (Modulus of Resilience), kJ/m3 160
720
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
22
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 2.2
6.9
Thermal Shock Resistance, points 14
17

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.1
Chromium (Cr), % 27 to 30
8.0 to 10.5
Cobalt (Co), % 48 to 52
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 9.7 to 24.5
85.6 to 90.8
Manganese (Mn), % 0 to 1.5
0.4 to 0.7
Molybdenum (Mo), % 0 to 0.5
0.8 to 1.2
Nickel (Ni), % 0 to 4.0
0 to 0.5
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.025
Silicon (Si), % 0.5 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.025
Residuals, % 0
0 to 0.5