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R30605 Cobalt vs. ASTM B685 Alloy

R30605 cobalt belongs to the cobalt alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
120
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 81
43
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 290
180
Melting Completion (Liquidus), °C 1410
1230
Melting Onset (Solidus), °C 1330
1200
Specific Heat Capacity, J/kg-K 410
300
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
4.1

Otherwise Unclassified Properties

Density, g/cm3 9.6
11

Common Calculations

Stiffness to Weight: Axial, points 12
6.1
Stiffness to Weight: Bending, points 21
15
Strength to Weight: Axial, points 33 to 55
17 to 27
Strength to Weight: Bending, points 25 to 36
16 to 21
Thermal Shock Resistance, points 31 to 52
28 to 46

Alloy Composition


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Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0.050 to 0.15
0
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
39.5 to 40.5
Iron (Fe), % 0 to 3.0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 1.0 to 2.0
0
Nickel (Ni), % 9.0 to 11
0
Palladium (Pd), % 0
59 to 60.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 14 to 16
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.2

Comparable Variants