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R31538 Cobalt vs. AWS BAg-8a

R31538 cobalt belongs to the cobalt alloys classification, while AWS BAg-8a 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 R31538 cobalt and the bottom bar is AWS BAg-8a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
83
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 86
31
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
150

Thermal Properties

Latent Heat of Fusion, J/g 320
140
Melting Completion (Liquidus), °C 1360
770
Melting Onset (Solidus), °C 1290
770
Specific Heat Capacity, J/kg-K 450
290
Thermal Expansion, µm/m-K 13
19

Otherwise Unclassified Properties

Density, g/cm3 8.4
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.6
Stiffness to Weight: Bending, points 24
15
Strength to Weight: Axial, points 34 to 45
4.2
Strength to Weight: Bending, points 27 to 32
6.3
Thermal Shock Resistance, points 25 to 33
6.7

Alloy Composition


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Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
26.4 to 28.8
Iron (Fe), % 0 to 0.75
0
Lithium (Li), % 0
0.25 to 0.5
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
71 to 73
Residuals, % 0
0 to 0.15