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AWS BVAg-18 vs. R31539 Cobalt

AWS BVAg-18 belongs to the otherwise unclassified metals classification, while R31539 cobalt belongs to the cobalt alloys. There are 17 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 AWS BVAg-18 and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 82
220
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 30
86
Tensile Strength: Ultimate (UTS), MPa 180
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 140
320
Melting Completion (Liquidus), °C 720
1360
Melting Onset (Solidus), °C 600
1290
Specific Heat Capacity, J/kg-K 280
450
Thermal Expansion, µm/m-K 19
13

Otherwise Unclassified Properties

Density, g/cm3 9.7
8.4
Embodied Carbon, kg CO2/kg material 59
8.2
Embodied Energy, MJ/kg 930
110

Common Calculations

Stiffness to Weight: Axial, points 4.7
15
Stiffness to Weight: Bending, points 15
24
Strength to Weight: Axial, points 5.1
33 to 44
Strength to Weight: Bending, points 7.3
27 to 32
Thermal Shock Resistance, points 8.1
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 28.5 to 31.5
0
Iron (Fe), % 0
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Lead (Pb), % 0 to 0.0020
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.0020
0
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 59 to 61
0
Tin (Sn), % 9.5 to 10.5
0
Zinc (Zn), % 0 to 0.0010
0