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R30008 Cobalt vs. AWS ERNiCr-3

R30008 cobalt belongs to the cobalt alloys classification, while AWS ERNiCr-3 belongs to the nickel alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. There are 20 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R30008 cobalt and the bottom bar is AWS ERNiCr-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 1.1 to 73
34
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
630

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1330
1330
Specific Heat Capacity, J/kg-K 450
460
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 95
70
Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.1
11
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 400
280

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 31 to 56
21
Strength to Weight: Bending, points 25 to 37
19
Thermal Shock Resistance, points 25 to 44
18

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.1
Chromium (Cr), % 18.5 to 21.5
18 to 22
Cobalt (Co), % 39 to 42
0 to 0.12
Copper (Cu), % 0
0 to 0.5
Iron (Fe), % 7.6 to 20
0 to 3.0
Manganese (Mn), % 1.0 to 2.0
2.5 to 3.5
Molybdenum (Mo), % 6.5 to 7.5
0
Nickel (Ni), % 15 to 18
67 to 77.5
Niobium (Nb), % 0
2.0 to 3.0
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 1.2
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0
0 to 0.75
Residuals, % 0
0 to 0.5