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R30006 Cobalt vs. AWS E630

R30006 cobalt belongs to the cobalt alloys classification, while AWS E630 belongs to the iron alloys. They have a modest 20% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30006 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, % 1.0
8.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 900
1040

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1290
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 1.6
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
2.8
Embodied Energy, MJ/kg 110
40
Embodied Water, L/kg 500
140

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
37
Strength to Weight: Bending, points 24
29
Thermal Diffusivity, mm2/s 3.9
4.5
Thermal Shock Resistance, points 26
28

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.050
Chromium (Cr), % 27 to 32
16 to 16.8
Cobalt (Co), % 48.6 to 68.1
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), % 0 to 1.0
0 to 0.75
Nickel (Ni), % 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 2.0
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0