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ASTM B617 Coin Silver vs. AWS BCo-1

ASTM B617 coin silver belongs to the otherwise unclassified metals classification, while AWS BCo-1 belongs to the cobalt alloys. There are 15 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 AWS BCo-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
200
Poisson's Ratio 0.37
0.3
Shear Modulus, GPa 28
78
Tensile Strength: Ultimate (UTS), MPa 290 to 520
700

Thermal Properties

Latent Heat of Fusion, J/g 120
420
Melting Completion (Liquidus), °C 870
1150
Melting Onset (Solidus), °C 780
1120
Specific Heat Capacity, J/kg-K 250
480
Thermal Expansion, µm/m-K 19
12

Otherwise Unclassified Properties

Density, g/cm3 10
8.1

Common Calculations

Stiffness to Weight: Axial, points 4.1
14
Stiffness to Weight: Bending, points 14
24
Strength to Weight: Axial, points 7.7 to 14
24
Strength to Weight: Bending, points 9.3 to 14
22
Thermal Shock Resistance, points 14 to 25
21

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0 to 0.050
Boron (B), % 0
0.7 to 0.9
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0.35 to 0.45
Chromium (Cr), % 0
18 to 20
Cobalt (Co), % 0
46 to 54
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
Nickel (Ni), % 0 to 0.010
16 to 18
Phosphorus (P), % 0 to 0.020
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0
7.5 to 8.5
Silver (Ag), % 89.6 to 91
0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Tungsten (W), % 0
3.5 to 4.5
Zinc (Zn), % 0 to 0.060
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0 to 0.060
0 to 0.5