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AWS ERNi-1 vs. R31538 Cobalt

AWS ERNi-1 belongs to the nickel alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is AWS ERNi-1 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
220
Elongation at Break, % 22
13 to 23
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 69
86
Tensile Strength: Ultimate (UTS), MPa 470
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1360
1360
Melting Onset (Solidus), °C 1310
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 73
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 19
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 19
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.7
8.4
Embodied Carbon, kg CO2/kg material 11
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 230
530

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 15
34 to 45
Strength to Weight: Bending, points 15
27 to 32
Thermal Diffusivity, mm2/s 19
3.5
Thermal Shock Resistance, points 17
25 to 33

Alloy Composition

Aluminum (Al), % 0 to 1.5
0
Carbon (C), % 0 to 0.15
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 1.0
0 to 0.75
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 93 to 98
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.75
0 to 1.0
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 2.0 to 3.5
0
Residuals, % 0 to 0.5
0