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ASTM B617 Coin Silver vs. ASTM A387 Grade 91 Class 2

ASTM B617 coin silver belongs to the otherwise unclassified metals classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is ASTM B617 coin silver and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 75
190
Elongation at Break, % 1.1 to 22
20
Poisson's Ratio 0.37
0.28
Shear Modulus, GPa 28
75
Shear Strength, MPa 180 to 290
420
Tensile Strength: Ultimate (UTS), MPa 290 to 520
670

Thermal Properties

Latent Heat of Fusion, J/g 120
270
Melting Completion (Liquidus), °C 870
1460
Melting Onset (Solidus), °C 780
1420
Specific Heat Capacity, J/kg-K 250
470
Thermal Expansion, µm/m-K 19
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 83
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 72
10

Otherwise Unclassified Properties

Density, g/cm3 10
7.8

Common Calculations

Stiffness to Weight: Axial, points 4.1
14
Stiffness to Weight: Bending, points 14
25
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
19

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0 to 0.020
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Copper (Cu), % 9.0 to 10.4
0
Iron (Fe), % 0 to 0.050
87.3 to 90.3
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0 to 0.010
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0 to 0.020
0 to 0.020
Silicon (Si), % 0
0.2 to 0.5
Silver (Ag), % 89.6 to 91
0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 0 to 0.060
0
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.060
0