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ASTM B522 Class II vs. R30001 Cobalt

ASTM B522 class II belongs to the otherwise unclassified metals classification, while R30001 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ASTM B522 class II and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 96
220
Elongation at Break, % 1.1 to 28
1.0
Poisson's Ratio 0.41
0.28
Shear Modulus, GPa 34
86
Tensile Strength: Ultimate (UTS), MPa 280 to 490
620

Thermal Properties

Latent Heat of Fusion, J/g 77
310
Melting Completion (Liquidus), °C 1030
1530
Melting Onset (Solidus), °C 1030
1260
Specific Heat Capacity, J/kg-K 160
430
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 5.7
1.8

Otherwise Unclassified Properties

Density, g/cm3 17
9.0

Common Calculations

Stiffness to Weight: Axial, points 3.1
14
Stiffness to Weight: Bending, points 8.9
22
Strength to Weight: Axial, points 4.4 to 7.8
19
Strength to Weight: Bending, points 5.5 to 8.0
18
Thermal Shock Resistance, points 13 to 24
19

Alloy Composition


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Carbon (C), % 0
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Gold (Au), % 68.5 to 69.5
0
Iron (Fe), % 0
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Platinum (Pt), % 5.5 to 6.5
0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 24.5 to 25.5
0
Sulfur (S), % 0 to 0.010
0
Tungsten (W), % 0
11 to 13
Residuals, % 0 to 0.26
0