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R31538 Cobalt vs. AWS BVAu-2

R31538 cobalt belongs to the cobalt alloys classification, while AWS BVAu-2 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS BVAu-2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
100
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 86
36
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
150

Thermal Properties

Latent Heat of Fusion, J/g 320
92
Melting Completion (Liquidus), °C 1360
890
Melting Onset (Solidus), °C 1290
890
Specific Heat Capacity, J/kg-K 450
180
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
17

Common Calculations

Stiffness to Weight: Axial, points 15
3.3
Stiffness to Weight: Bending, points 24
9.1
Strength to Weight: Axial, points 34 to 45
2.4
Strength to Weight: Bending, points 27 to 32
3.6
Thermal Shock Resistance, points 25 to 33
7.1

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0.15 to 0.35
0 to 0.0050
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
19.5 to 20.5
Gold (Au), % 0
79.5 to 80.5
Iron (Fe), % 0 to 0.75
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.0020
Silicon (Si), % 0 to 1.0
0
Zinc (Zn), % 0
0 to 0.0010