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R30021 Cobalt vs. AWS ER80S-Ni2

R30021 cobalt belongs to the cobalt alloys classification, while AWS ER80S-Ni2 belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is AWS ER80S-Ni2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
27
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 700
620
Tensile Strength: Yield (Proof), MPa 500
540

Thermal Properties

Latent Heat of Fusion, J/g 330
260
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.6
Embodied Energy, MJ/kg 110
22
Embodied Water, L/kg 520
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
160
Resilience: Unit (Modulus of Resilience), kJ/m3 570
770
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
22
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.8
14
Thermal Shock Resistance, points 21
18

Alloy Composition


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Carbon (C), % 0.2 to 0.35
0 to 0.12
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 0 to 3.0
94.2 to 97.6
Manganese (Mn), % 0
0 to 1.3
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
2.0 to 2.8
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.5
0.4 to 0.8
Sulfur (S), % 0
0 to 0.025
Residuals, % 0
0 to 0.5