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ASTM B522 Class II vs. R30003 Cobalt

ASTM B522 class II belongs to the otherwise unclassified metals classification, while R30003 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is ASTM B522 class II and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 96
210
Elongation at Break, % 1.1 to 28
10 to 73
Poisson's Ratio 0.41
0.29
Shear Modulus, GPa 34
83
Tensile Strength: Ultimate (UTS), MPa 280 to 490
970 to 1720
Tensile Strength: Yield (Proof), MPa 120 to 210
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 77
310
Melting Completion (Liquidus), °C 1030
1400
Melting Onset (Solidus), °C 1030
1440
Specific Heat Capacity, J/kg-K 160
450
Thermal Expansion, µm/m-K 15
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 5.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 17
8.4

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 230
600 to 2790
Stiffness to Weight: Axial, points 3.1
14
Stiffness to Weight: Bending, points 8.9
24
Strength to Weight: Axial, points 4.4 to 7.8
32 to 57
Strength to Weight: Bending, points 5.5 to 8.0
26 to 38
Thermal Shock Resistance, points 13 to 24
26 to 45

Alloy Composition


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Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Gold (Au), % 68.5 to 69.5
0
Iron (Fe), % 0
10 to 20.5
Manganese (Mn), % 0
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0
14 to 16
Phosphorus (P), % 0
0 to 0.015
Platinum (Pt), % 5.5 to 6.5
0
Silicon (Si), % 0
0 to 1.2
Silver (Ag), % 24.5 to 25.5
0
Sulfur (S), % 0 to 0.010
0 to 0.015
Residuals, % 0 to 0.26
0

Comparable Variants