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R30155 Cobalt vs. AWS BNi-7

R30155 cobalt belongs to the iron alloys classification, while AWS BNi-7 belongs to the nickel alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is AWS BNi-7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
170
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 81
67
Tensile Strength: Ultimate (UTS), MPa 850
550

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1470
890
Melting Onset (Solidus), °C 1420
890
Specific Heat Capacity, J/kg-K 450
490
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 80
55
Density, g/cm3 8.5
8.0
Embodied Carbon, kg CO2/kg material 9.7
8.8
Embodied Energy, MJ/kg 150
120
Embodied Water, L/kg 300
240

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 28
19
Strength to Weight: Bending, points 24
19
Thermal Shock Resistance, points 21
21

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
0 to 0.010
Carbon (C), % 0.080 to 0.16
0 to 0.060
Chromium (Cr), % 20 to 22.5
13 to 15
Cobalt (Co), % 18.5 to 21
0 to 0.1
Iron (Fe), % 24.3 to 36.2
0 to 0.2
Manganese (Mn), % 1.0 to 2.0
0 to 0.040
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
73.3 to 77.3
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.040
9.7 to 10.5
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.030
0 to 0.020
Tantalum (Ta), % 0.75 to 1.3
0
Titanium (Ti), % 0
0 to 0.050
Tungsten (W), % 2.0 to 3.0
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5