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ASTM B617 Coin Silver vs. R30035 Cobalt

ASTM B617 coin silver belongs to the otherwise unclassified metals classification, while R30035 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 B617 coin silver and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
220 to 230
Elongation at Break, % 1.1 to 22
9.0 to 46
Poisson's Ratio 0.37
0.29
Shear Modulus, GPa 28
84 to 89
Tensile Strength: Ultimate (UTS), MPa 290 to 520
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 120
320
Melting Completion (Liquidus), °C 870
1440
Melting Onset (Solidus), °C 780
1320
Specific Heat Capacity, J/kg-K 250
440
Thermal Expansion, µm/m-K 19
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 83
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 72
1.8

Otherwise Unclassified Properties

Density, g/cm3 10
8.7

Common Calculations

Stiffness to Weight: Axial, points 4.1
14 to 15
Stiffness to Weight: Bending, points 14
23 to 24
Strength to Weight: Axial, points 7.7 to 14
29 to 61
Strength to Weight: Bending, points 9.3 to 14
24 to 39
Thermal Shock Resistance, points 14 to 25
23 to 46

Alloy Composition


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Aluminum (Al), % 0 to 0.0050
0
Boron (B), % 0
0 to 0.015
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 9.0 to 10.4
0
Iron (Fe), % 0 to 0.050
0 to 1.0
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 0 to 0.010
33 to 37
Phosphorus (P), % 0 to 0.020
0 to 0.015
Silicon (Si), % 0
0 to 0.15
Silver (Ag), % 89.6 to 91
0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Zinc (Zn), % 0 to 0.060
0
Residuals, % 0 to 0.060
0

Comparable Variants