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Annealed ASTM B685 Alloy vs. Annealed R30605 Cobalt

Annealed ASTM B685 alloy belongs to the otherwise unclassified metals classification, while annealed R30605 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
210
Elongation at Break, % 23
34
Poisson's Ratio 0.37
0.29
Shear Modulus, GPa 43
81
Tensile Strength: Ultimate (UTS), MPa 660
1130

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 11
9.6

Common Calculations

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

Alloy Composition

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