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ASTM B617 Coin Silver vs. R30001 Cobalt

ASTM B617 coin silver 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 (8, in this case) are not shown.

For each property being compared, the top bar is ASTM B617 coin silver and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
220
Elongation at Break, % 1.1 to 22
1.0
Poisson's Ratio 0.37
0.28
Shear Modulus, GPa 28
86
Tensile Strength: Ultimate (UTS), MPa 290 to 520
620

Thermal Properties

Latent Heat of Fusion, J/g 120
310
Melting Completion (Liquidus), °C 870
1530
Melting Onset (Solidus), °C 780
1260
Specific Heat Capacity, J/kg-K 250
430
Thermal Expansion, µm/m-K 19
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 83
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 72
1.8

Otherwise Unclassified Properties

Density, g/cm3 10
9.0

Common Calculations

Stiffness to Weight: Axial, points 4.1
14
Stiffness to Weight: Bending, points 14
22
Strength to Weight: Axial, points 7.7 to 14
19
Strength to Weight: Bending, points 9.3 to 14
18
Thermal Shock Resistance, points 14 to 25
19

Alloy Composition


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Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Copper (Cu), % 9.0 to 10.4
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 0.020
0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 89.6 to 91
0
Tungsten (W), % 0
11 to 13
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.060
0