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R30003 Cobalt vs. AWS BVAg-8b

R30003 cobalt belongs to the cobalt alloys classification, while AWS BVAg-8b belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is AWS BVAg-8b.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
84
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 83
31
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
170

Thermal Properties

Latent Heat of Fusion, J/g 310
140
Melting Completion (Liquidus), °C 1400
800
Melting Onset (Solidus), °C 1440
780
Specific Heat Capacity, J/kg-K 450
280
Thermal Expansion, µm/m-K 13
19

Otherwise Unclassified Properties

Density, g/cm3 8.4
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.7
Stiffness to Weight: Bending, points 24
15
Strength to Weight: Axial, points 32 to 57
4.7
Strength to Weight: Bending, points 26 to 38
6.8
Thermal Shock Resistance, points 26 to 45
7.6

Alloy Composition

Boron (B), % 0 to 0.1
0
Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0 to 0.15
0 to 0.0050
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
26.8 to 29.2
Iron (Fe), % 10 to 20.5
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 1.5 to 2.5
0
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
0.3 to 0.7
Phosphorus (P), % 0 to 0.015
0 to 0.0020
Silicon (Si), % 0 to 1.2
0
Silver (Ag), % 0
70.5 to 72.5
Sulfur (S), % 0 to 0.015
0
Zinc (Zn), % 0
0 to 0.0010