ASTM B522 Class I vs. ASTM B522 Class II
Both ASTM B522 class I and ASTM B522 class II are otherwise unclassified metals. Their average alloy composition is basically identical.
For each property being compared, the top bar is ASTM B522 class I and the bottom bar is ASTM B522 class II.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 96 |
| Elongation at Break, % | 1.1 to 29 | |
| 1.1 to 28 |
| 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 | 5.8 | |
| 5.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 17 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.5 to 64 | |
| 4.4 to 63 |
| 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
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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 |