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R30155 Cobalt vs. AWS BVAu-7

R30155 cobalt belongs to the iron alloys classification, while AWS BVAu-7 belongs to the otherwise unclassified metals. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 15 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
130
Poisson's Ratio 0.29
0.38
Shear Modulus, GPa 81
45
Tensile Strength: Ultimate (UTS), MPa 850
200

Thermal Properties

Latent Heat of Fusion, J/g 300
140
Melting Completion (Liquidus), °C 1470
1120
Melting Onset (Solidus), °C 1420
1100
Specific Heat Capacity, J/kg-K 450
240
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Density, g/cm3 8.5
15

Common Calculations

Stiffness to Weight: Axial, points 14
4.7
Stiffness to Weight: Bending, points 23
11
Strength to Weight: Axial, points 28
3.7
Strength to Weight: Bending, points 24
5.1
Thermal Shock Resistance, points 21
8.9

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0.080 to 0.16
0 to 0.0050
Chromium (Cr), % 20 to 22.5
0
Cobalt (Co), % 18.5 to 21
0 to 0.060
Gold (Au), % 0
49.5 to 50.5
Iron (Fe), % 24.3 to 36.2
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 1.0 to 2.0
0
Molybdenum (Mo), % 2.5 to 3.5
0
Nickel (Ni), % 19 to 21
24.5 to 25.5
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0
Palladium (Pd), % 0
23.9 to 26
Phosphorus (P), % 0 to 0.040
0 to 0.0020
Silicon (Si), % 0 to 1.0
0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0
Zinc (Zn), % 0
0 to 0.0010