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AWS ERNi-1 vs. R30816 Cobalt

AWS ERNi-1 belongs to the nickel alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 21% 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 ERNi-1 and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
210
Elongation at Break, % 22
23
Poisson's Ratio 0.31
0.3
Shear Modulus, GPa 69
81
Tensile Strength: Ultimate (UTS), MPa 470
1020

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1360
1540
Melting Onset (Solidus), °C 1310
1460
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 73
13
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 8.7
9.1
Embodied Carbon, kg CO2/kg material 11
20
Embodied Energy, MJ/kg 150
320
Embodied Water, L/kg 230
440

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
22
Strength to Weight: Axial, points 15
31
Strength to Weight: Bending, points 15
25
Thermal Diffusivity, mm2/s 19
3.3
Thermal Shock Resistance, points 17
28

Alloy Composition

Aluminum (Al), % 0 to 1.5
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), % 0 to 0.25
0
Iron (Fe), % 0 to 1.0
0 to 5.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 93 to 98
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 0.75
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Titanium (Ti), % 2.0 to 3.5
0
Tungsten (W), % 0
3.5 to 4.5
Residuals, % 0 to 0.5
0