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R30021 Cobalt vs. AWS BAu-3

R30021 cobalt belongs to the cobalt alloys classification, while AWS BAu-3 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.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is AWS BAu-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
110
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 86
41
Tensile Strength: Ultimate (UTS), MPa 700
220

Thermal Properties

Latent Heat of Fusion, J/g 330
160
Melting Completion (Liquidus), °C 1350
1030
Melting Onset (Solidus), °C 1190
970
Specific Heat Capacity, J/kg-K 450
300
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
13

Common Calculations

Stiffness to Weight: Axial, points 15
5.0
Stiffness to Weight: Bending, points 24
13
Strength to Weight: Axial, points 23
4.9
Strength to Weight: Bending, points 21
6.4
Thermal Shock Resistance, points 21
8.7

Alloy Composition


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Carbon (C), % 0.2 to 0.35
0
Chromium (Cr), % 26 to 29
0
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
60.9 to 63
Gold (Au), % 0
34.5 to 35.5
Iron (Fe), % 0 to 3.0
0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
2.5 to 3.5
Silicon (Si), % 0 to 1.5
0
Residuals, % 0
0 to 0.15