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AWS ERNiCu-7 vs. R30816 Cobalt

AWS ERNiCu-7 belongs to the nickel alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 AWS ERNiCu-7 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 160
210
Elongation at Break, % 34
23
Poisson's Ratio 0.32
0.3
Shear Modulus, GPa 61
81
Tensile Strength: Ultimate (UTS), MPa 550
1020

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1280
1540
Melting Onset (Solidus), °C 1240
1460
Specific Heat Capacity, J/kg-K 440
420
Thermal Conductivity, W/m-K 20
13
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.7
9.1
Embodied Carbon, kg CO2/kg material 8.5
20
Embodied Energy, MJ/kg 120
320
Embodied Water, L/kg 250
440

Common Calculations

Stiffness to Weight: Axial, points 10
13
Stiffness to Weight: Bending, points 21
22
Strength to Weight: Axial, points 18
31
Strength to Weight: Bending, points 17
25
Thermal Diffusivity, mm2/s 5.3
3.3
Thermal Shock Resistance, points 19
28

Alloy Composition


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Aluminum (Al), % 0 to 1.3
0
Carbon (C), % 0 to 0.15
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 18.3 to 36.5
0
Iron (Fe), % 0 to 2.5
0 to 5.0
Manganese (Mn), % 0 to 4.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 62 to 69
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 1.3
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 1.5 to 3.0
0
Tungsten (W), % 0
3.5 to 4.5
Residuals, % 0 to 0.5
0