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AWS BVAg-31 vs. R31538 Cobalt

AWS BVAg-31 belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. 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 AWS BVAg-31 and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 90
220
Poisson's Ratio 0.36
0.29
Shear Modulus, GPa 33
86
Tensile Strength: Ultimate (UTS), MPa 180
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 150
320
Melting Completion (Liquidus), °C 850
1360
Melting Onset (Solidus), °C 820
1290
Specific Heat Capacity, J/kg-K 280
450
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Density, g/cm3 10
8.4

Common Calculations

Stiffness to Weight: Axial, points 4.9
15
Stiffness to Weight: Bending, points 15
24
Strength to Weight: Axial, points 4.9
34 to 45
Strength to Weight: Bending, points 7.0
27 to 32
Thermal Shock Resistance, points 7.8
25 to 33

Alloy Composition

Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0.15 to 0.35
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 31 to 33
0
Iron (Fe), % 0
0 to 0.75
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
Palladium (Pd), % 8.0 to 12
0
Phosphorus (P), % 0 to 0.0020
0
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 57 to 59
0
Zinc (Zn), % 0 to 0.0010
0