ASTM B522 Class II vs. ASTM B541 Gold
Both ASTM B522 class II and ASTM B541 gold are otherwise unclassified metals. They have 80% of their average alloy composition in common.
For each property being compared, the top bar is ASTM B522 class II and the bottom bar is ASTM B541 gold.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 110 |
| Elongation at Break, % | 1.1 to 28 | |
| 6.0 to 14 |
| Knoop Hardness | 88 to 150 | |
| 220 to 340 |
| Poisson's Ratio | 0.41 | |
| 0.4 |
| Shear Modulus, GPa | 34 | |
| 38 |
| Shear Strength, MPa | 180 to 280 | |
| 410 to 690 |
| Tensile Strength: Ultimate (UTS), MPa | 280 to 490 | |
| 670 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 120 to 210 | |
| 480 to 900 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 90 |
| Melting Completion (Liquidus), °C | 1030 | |
| 1110 |
| Melting Onset (Solidus), °C | 1030 | |
| 930 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 170 |
| Thermal Expansion, µm/m-K | 15 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 7.7 to 12 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.7 | |
| 4.0 to 6.2 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 17 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.4 to 63 | |
| 65 to 91 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 75 to 230 | |
| 1090 to 3830 |
| Stiffness to Weight: Axial, points | 3.1 | |
| 3.4 |
| Stiffness to Weight: Bending, points | 8.9 | |
| 9.0 |
| Strength to Weight: Axial, points | 4.4 to 7.8 | |
| 11 to 19 |
| Strength to Weight: Bending, points | 5.5 to 8.0 | |
| 9.8 to 14 |
| Thermal Shock Resistance, points | 13 to 24 | |
| 36 to 63 |
Alloy Composition
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| Copper (Cu), % | 0 | |
| 13.5 to 15.5 |
| Gold (Au), % | 68.5 to 69.5 | |
| 70.5 to 72.5 |
| Platinum (Pt), % | 5.5 to 6.5 | |
| 8.0 to 9.0 |
| Silver (Ag), % | 24.5 to 25.5 | |
| 4.0 to 5.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0.7 to 1.3 |
| Residuals, % | 0 to 0.26 | |
| 0 to 0.4 |