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ASTM B628 Ag-Cu vs. R30012 Cobalt

ASTM B628 Ag-Cu belongs to the otherwise unclassified metals classification, while R30012 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 B628 Ag-Cu and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
220
Elongation at Break, % 1.1 to 17
1.0
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 31
86
Tensile Strength: Ultimate (UTS), MPa 350 to 760
830

Thermal Properties

Latent Heat of Fusion, J/g 140
320
Melting Completion (Liquidus), °C 780
1470
Melting Onset (Solidus), °C 780
1280
Specific Heat Capacity, J/kg-K 280
440
Thermal Expansion, µm/m-K 19
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 84
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 75
1.8

Otherwise Unclassified Properties

Density, g/cm3 10
8.8

Common Calculations

Stiffness to Weight: Axial, points 4.6
14
Stiffness to Weight: Bending, points 14
23
Strength to Weight: Axial, points 9.5 to 21
26
Strength to Weight: Bending, points 11 to 18
22
Thermal Shock Resistance, points 16 to 34
23

Alloy Composition


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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), % 26.6 to 29
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 to 0.010
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 71 to 73
0
Tungsten (W), % 0
7.5 to 9.5
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.21
0