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R30021 Cobalt vs. AWS E630

R30021 cobalt belongs to the cobalt alloys classification, while AWS E630 belongs to the iron alloys. They have a modest 21% 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 E630.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
8.0
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 700
1040

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.8
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 520
140

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
37
Strength to Weight: Bending, points 21
29
Thermal Diffusivity, mm2/s 3.8
4.5
Thermal Shock Resistance, points 21
28

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 29
16 to 16.8
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
3.3 to 4.0
Iron (Fe), % 0 to 3.0
71.6 to 75.9
Manganese (Mn), % 0
0.25 to 0.75
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.75
Nickel (Ni), % 2.0 to 3.0
4.5 to 5.0
Niobium (Nb), % 0
0.15 to 0.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 0.75
Sulfur (S), % 0
0 to 0.030