Annealed ASTM B522 Class I vs. Annealed ASTM B522 Class II
Both annealed ASTM B522 class I and annealed ASTM B522 class II are otherwise unclassified metals. Both are furnished in the annealed condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is annealed ASTM B522 class I and the bottom bar is annealed ASTM B522 class II.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 96 |
| Elongation at Break, % | 29 | |
| 28 |
| Knoop Hardness | 88 | |
| 88 |
| Poisson's Ratio | 0.41 | |
| 0.41 |
| Shear Modulus, GPa | 34 | |
| 34 |
| Shear Strength, MPa | 180 | |
| 180 |
| Tensile Strength: Ultimate (UTS), MPa | 280 | |
| 280 |
| Tensile Strength: Yield (Proof), MPa | 120 | |
| 120 |
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 | 5.8 | |
| 5.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 17 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 64 | |
| 63 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 75 | |
| 75 |
| 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 | |
| 4.4 |
| Strength to Weight: Bending, points | 5.5 | |
| 5.5 |
| Thermal Shock Resistance, points | 13 | |
| 13 |
Alloy Composition
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| Gold (Au), % | 68 to 70 | |
| 68.5 to 69.5 |
| Platinum (Pt), % | 5.0 to 7.0 | |
| 5.5 to 6.5 |
| Silver (Ag), % | 23.5 to 26.5 | |
| 24.5 to 25.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Residuals, % | 0 to 0.35 | |
| 0 to 0.26 |