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ASTM B685 Alloy vs. R30012 Cobalt

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while R30012 cobalt belongs to the cobalt alloys. There are 17 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 B685 alloy and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
220
Poisson's Ratio 0.37
0.28
Shear Modulus, GPa 43
86
Tensile Strength: Ultimate (UTS), MPa 660 to 1060
830

Thermal Properties

Latent Heat of Fusion, J/g 180
320
Melting Completion (Liquidus), °C 1230
1470
Melting Onset (Solidus), °C 1200
1280
Specific Heat Capacity, J/kg-K 300
440
Thermal Expansion, µm/m-K 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 5.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 4.1
1.8

Otherwise Unclassified Properties

Density, g/cm3 11
8.8

Common Calculations

Stiffness to Weight: Axial, points 6.1
14
Stiffness to Weight: Bending, points 15
23
Strength to Weight: Axial, points 17 to 27
26
Strength to Weight: Bending, points 16 to 21
22
Thermal Shock Resistance, points 28 to 46
23

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 39.5 to 40.5
0
Iron (Fe), % 0 to 0.050
0 to 3.0
Lead (Pb), % 0 to 0.030
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Palladium (Pd), % 59 to 60.5
0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 0 to 0.1
0
Tungsten (W), % 0
7.5 to 9.5
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.2
0