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R31538 Cobalt vs. AWS BNi-5a

R31538 cobalt belongs to the cobalt alloys classification, while AWS BNi-5a belongs to the nickel alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS BNi-5a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
480

Thermal Properties

Latent Heat of Fusion, J/g 320
420
Melting Completion (Liquidus), °C 1360
1150
Melting Onset (Solidus), °C 1290
1070
Specific Heat Capacity, J/kg-K 450
500
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
9.0
Embodied Energy, MJ/kg 110
130
Embodied Water, L/kg 530
260

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
17
Strength to Weight: Bending, points 27 to 32
17
Thermal Shock Resistance, points 25 to 33
15

Alloy Composition


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Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
1.0 to 1.5
Carbon (C), % 0.15 to 0.35
0 to 0.1
Chromium (Cr), % 26 to 30
18.5 to 19.5
Cobalt (Co), % 58.7 to 68.9
0 to 0.1
Iron (Fe), % 0 to 0.75
0 to 0.5
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
70.1 to 73.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 1.0
7.0 to 7.5
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5