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ASTM B522 Class II vs. R30021 Cobalt

ASTM B522 class II belongs to the otherwise unclassified metals classification, while R30021 cobalt belongs to the cobalt alloys. There are 21 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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 96
220
Elongation at Break, % 1.1 to 28
9.0
Poisson's Ratio 0.41
0.29
Shear Modulus, GPa 34
86
Tensile Strength: Ultimate (UTS), MPa 280 to 490
700
Tensile Strength: Yield (Proof), MPa 120 to 210
500

Thermal Properties

Latent Heat of Fusion, J/g 77
330
Melting Completion (Liquidus), °C 1030
1350
Melting Onset (Solidus), °C 1030
1190
Specific Heat Capacity, J/kg-K 160
450
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 5.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 17
8.4

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.4 to 63
57
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 230
570
Stiffness to Weight: Axial, points 3.1
15
Stiffness to Weight: Bending, points 8.9
24
Strength to Weight: Axial, points 4.4 to 7.8
23
Strength to Weight: Bending, points 5.5 to 8.0
21
Thermal Shock Resistance, points 13 to 24
21

Alloy Composition


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Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Gold (Au), % 68.5 to 69.5
0
Iron (Fe), % 0
0 to 3.0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Platinum (Pt), % 5.5 to 6.5
0
Silicon (Si), % 0
0 to 1.5
Silver (Ag), % 24.5 to 25.5
0
Sulfur (S), % 0 to 0.010
0
Residuals, % 0 to 0.26
0