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AWS BNi-7 vs. R30605 Cobalt

AWS BNi-7 belongs to the nickel alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 24% 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 (9, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-7 and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170
210
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 67
81
Tensile Strength: Ultimate (UTS), MPa 550
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 890
1410
Melting Onset (Solidus), °C 890
1330
Specific Heat Capacity, J/kg-K 490
410
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 8.0
9.6
Embodied Carbon, kg CO2/kg material 8.8
9.8
Embodied Energy, MJ/kg 120
140
Embodied Water, L/kg 240
450

Common Calculations

Stiffness to Weight: Axial, points 12
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 19
33 to 55
Strength to Weight: Bending, points 19
25 to 36
Thermal Shock Resistance, points 21
31 to 52

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.060
0.050 to 0.15
Chromium (Cr), % 13 to 15
19 to 21
Cobalt (Co), % 0 to 0.1
46.4 to 57
Iron (Fe), % 0 to 0.2
0 to 3.0
Manganese (Mn), % 0 to 0.040
1.0 to 2.0
Nickel (Ni), % 73.3 to 77.3
9.0 to 11
Phosphorus (P), % 9.7 to 10.5
0 to 0.040
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
0 to 0.4
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 0
14 to 16
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0