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ASTM B617 Coin Silver vs. R30816 Cobalt

ASTM B617 coin silver belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is ASTM B617 coin silver and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
210
Elongation at Break, % 1.1 to 22
23
Poisson's Ratio 0.37
0.3
Shear Modulus, GPa 28
81
Tensile Strength: Ultimate (UTS), MPa 290 to 520
1020

Thermal Properties

Latent Heat of Fusion, J/g 120
300
Melting Completion (Liquidus), °C 870
1540
Melting Onset (Solidus), °C 780
1460
Specific Heat Capacity, J/kg-K 250
420
Thermal Expansion, µm/m-K 19
12

Otherwise Unclassified Properties

Density, g/cm3 10
9.1

Common Calculations

Stiffness to Weight: Axial, points 4.1
13
Stiffness to Weight: Bending, points 14
22
Strength to Weight: Axial, points 7.7 to 14
31
Strength to Weight: Bending, points 9.3 to 14
25
Thermal Shock Resistance, points 14 to 25
28

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0.32 to 0.42
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
40 to 49.8
Copper (Cu), % 9.0 to 10.4
0
Iron (Fe), % 0 to 0.050
0 to 5.0
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
3.5 to 4.5
Nickel (Ni), % 0 to 0.010
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 89.6 to 91
0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.060
0