ASTM A387 Grade 91 Class 2 vs. ASTM B617 Coin Silver
ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while ASTM B617 coin silver belongs to the otherwise unclassified metals. 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 A387 grade 91 class 2 and the bottom bar is ASTM B617 coin silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 75 |
| Elongation at Break, % | 20 | |
| 1.1 to 22 |
| Poisson's Ratio | 0.28 | |
| 0.37 |
| Shear Modulus, GPa | 75 | |
| 28 |
| Shear Strength, MPa | 420 | |
| 180 to 290 |
| Tensile Strength: Ultimate (UTS), MPa | 670 | |
| 290 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 120 |
| Melting Completion (Liquidus), °C | 1460 | |
| 870 |
| Melting Onset (Solidus), °C | 1420 | |
| 780 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 250 |
| Thermal Expansion, µm/m-K | 13 | |
| 19 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 83 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 10 | |
| 72 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 4.1 |
| Stiffness to Weight: Bending, points | 25 | |
| 14 |
| Strength to Weight: Axial, points | 24 | |
| 7.7 to 14 |
| Strength to Weight: Bending, points | 22 | |
| 9.3 to 14 |
| Thermal Shock Resistance, points | 19 | |
| 14 to 25 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.020 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0.080 to 0.12 | |
| 0 |
| Chromium (Cr), % | 8.0 to 9.5 | |
| 0 |
| Copper (Cu), % | 0 | |
| 9.0 to 10.4 |
| Iron (Fe), % | 87.3 to 90.3 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0 |
| Molybdenum (Mo), % | 0.85 to 1.1 | |
| 0 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0 to 0.010 |
| Niobium (Nb), % | 0.060 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0.030 to 0.070 | |
| 0 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.020 |
| Silicon (Si), % | 0.2 to 0.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 89.6 to 91 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Vanadium (V), % | 0.18 to 0.25 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Zirconium (Zr), % | 0 to 0.010 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.060 |