ASTM B522 Class II vs. ASTM B522 Class I
Both ASTM B522 class II and ASTM B522 class I are otherwise unclassified metals. Their average alloy composition is basically identical.
For each property being compared, the top bar is ASTM B522 class II and the bottom bar is ASTM B522 class I.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 96 |
| Elongation at Break, % | 1.1 to 28 | |
| 1.1 to 29 |
| Knoop Hardness | 88 to 150 | |
| 88 to 150 |
| Poisson's Ratio | 0.41 | |
| 0.41 |
| Shear Modulus, GPa | 34 | |
| 34 |
| Shear Strength, MPa | 180 to 280 | |
| 180 to 280 |
| Tensile Strength: Ultimate (UTS), MPa | 280 to 490 | |
| 280 to 490 |
| Tensile Strength: Yield (Proof), MPa | 120 to 210 | |
| 120 to 210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 77 |
| Melting Completion (Liquidus), °C | 1030 | |
| 1030 |
| Melting Onset (Solidus), °C | 1030 | |
| 1030 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 160 |
| Thermal Expansion, µm/m-K | 15 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.7 | |
| 5.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 17 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.4 to 63 | |
| 4.5 to 64 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 75 to 230 | |
| 75 to 230 |
| Stiffness to Weight: Axial, points | 3.1 | |
| 3.1 |
| Stiffness to Weight: Bending, points | 8.9 | |
| 8.9 |
| Strength to Weight: Axial, points | 4.4 to 7.8 | |
| 4.4 to 7.8 |
| Strength to Weight: Bending, points | 5.5 to 8.0 | |
| 5.5 to 8.0 |
| Thermal Shock Resistance, points | 13 to 24 | |
| 13 to 24 |
Alloy Composition
| Gold (Au), % | 68.5 to 69.5 | |
| 68 to 70 |
| Platinum (Pt), % | 5.5 to 6.5 | |
| 5.0 to 7.0 |
| Silver (Ag), % | 24.5 to 25.5 | |
| 23.5 to 26.5 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.35 |