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AWS BVAg-8b vs. R30155 Cobalt

AWS BVAg-8b belongs to the otherwise unclassified metals classification, while R30155 cobalt belongs to the iron alloys. 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 AWS BVAg-8b and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 84
210
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 31
81
Tensile Strength: Ultimate (UTS), MPa 170
850

Thermal Properties

Latent Heat of Fusion, J/g 140
300
Melting Completion (Liquidus), °C 800
1470
Melting Onset (Solidus), °C 780
1420
Specific Heat Capacity, J/kg-K 280
450
Thermal Expansion, µm/m-K 19
14

Otherwise Unclassified Properties

Density, g/cm3 10
8.5

Common Calculations

Stiffness to Weight: Axial, points 4.7
14
Stiffness to Weight: Bending, points 15
23
Strength to Weight: Axial, points 4.7
28
Strength to Weight: Bending, points 6.8
24
Thermal Shock Resistance, points 7.6
21

Alloy Composition

Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 26.8 to 29.2
0
Iron (Fe), % 0
24.3 to 36.2
Lead (Pb), % 0 to 0.0020
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0.3 to 0.7
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.0020
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 70.5 to 72.5
0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 0 to 0.0010
0