Annealed ASTM B522 Class I Gold-Silver-Platinum Alloy
Annealed ASTM B522 class I is ASTM B522 class I in the annealed condition. The graph bars on the material properties cards below compare annealed ASTM B522 class I to: precious metal electrical contact alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
96 GPa 14 x 106 psi
Elongation at Break
29 %
Knoop Hardness
88
Poisson's Ratio
0.41
Shear Modulus
34 GPa 5.0 x 106 psi
Shear Strength
180 MPa 26 x 103 psi
Tensile Strength: Ultimate (UTS)
280 MPa 40 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 17 x 103 psi
Thermal Properties
Latent Heat of Fusion
77 J/g
Melting Completion (Liquidus)
1030 °C 1890 °F
Melting Onset (Solidus)
1030 °C 1880 °F
Specific Heat Capacity
160 J/kg-K 0.037 BTU/lb-°F
Thermal Expansion
15 µm/m-K
Other Material Properties
Density
17 g/cm3 1070 lb/ft3
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
5.8 % IACS
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
64 MJ/m3
Resilience: Unit (Modulus of Resilience)
75 kJ/m3
Stiffness to Weight: Axial
3.1 points
Stiffness to Weight: Bending
8.9 points
Strength to Weight: Axial
4.4 points
Strength to Weight: Bending
5.5 points
Thermal Shock Resistance
13 points
Alloy Composition
| Au | 68 to 70 | |
| Ag | 23.5 to 26.5 | |
| Pt | 5.0 to 7.0 | |
| res. | 0 to 0.35 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B522: Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy