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R30075 Cobalt vs. AWS BNi-5a

R30075 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 (12, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is AWS BNi-5a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 82 to 98
72
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
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 12
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 14 to 17
13
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
17
Strength to Weight: Bending, points 22 to 31
17
Thermal Shock Resistance, points 21 to 29
15

Alloy Composition

Aluminum (Al), % 0 to 0.1
0 to 0.050
Boron (B), % 0 to 0.010
1.0 to 1.5
Carbon (C), % 0 to 0.35
0 to 0.1
Chromium (Cr), % 27 to 30
18.5 to 19.5
Cobalt (Co), % 58.7 to 68
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 0.5
70.1 to 73.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
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 to 0.010
0 to 0.020
Titanium (Ti), % 0 to 0.1
0 to 0.050
Tungsten (W), % 0 to 0.2
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5