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R30021 Cobalt vs. AWS E2595

R30021 cobalt belongs to the cobalt alloys classification, while AWS E2595 belongs to the iron alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 R30021 cobalt and the bottom bar is AWS E2595.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
17
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
850

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.0
4.4
Embodied Energy, MJ/kg 110
61
Embodied Water, L/kg 520
190

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
30
Strength to Weight: Bending, points 21
25
Thermal Diffusivity, mm2/s 3.8
4.2
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.040
Chromium (Cr), % 26 to 29
24 to 27
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.4 to 1.5
Iron (Fe), % 0 to 3.0
51.4 to 64.5
Manganese (Mn), % 0
0 to 2.5
Molybdenum (Mo), % 4.5 to 6.0
2.5 to 4.5
Nickel (Ni), % 2.0 to 3.0
8.0 to 10.5
Nitrogen (N), % 0
0.2 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 1.2
Sulfur (S), % 0
0 to 0.025
Tungsten (W), % 0
0.4 to 1.0