3/4-Hard ASTM B617 Coin Silver Alloy
3/4-hard ASTM B617 is ASTM B617 coin silver in the 3/4-hard temper. The graph bars on the material properties cards below compare 3/4-hard ASTM B617 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
75 GPa 11 x 106 psi
Elongation at Break
2.2 %
Poisson's Ratio
0.37
Shear Modulus
28 GPa 4.0 x 106 psi
Shear Strength
250 MPa 36 x 103 psi
Tensile Strength: Ultimate (UTS)
430 MPa 62 x 103 psi
Thermal Properties
Latent Heat of Fusion
120 J/g
Melting Completion (Liquidus)
870 °C 1600 °F
Melting Onset (Solidus)
780 °C 1430 °F
Specific Heat Capacity
250 J/kg-K 0.060 BTU/lb-°F
Thermal Expansion
19 µm/m-K
Other Material Properties
Density
10 g/cm3 650 lb/ft3
Electrical Conductivity: Equal Volume
83 % IACS
Electrical Conductivity: Equal Weight (Specific)
72 % IACS
Common Calculations
Stiffness to Weight: Axial
4.1 points
Stiffness to Weight: Bending
14 points
Strength to Weight: Axial
12 points
Strength to Weight: Bending
12 points
Thermal Shock Resistance
21 points
Alloy Composition
| Ag | 89.6 to 91 | |
| Cu | 9.0 to 10.4 | |
| Zn | 0 to 0.060 | |
| Fe | 0 to 0.050 | |
| Cd | 0 to 0.050 | |
| Pb | 0 to 0.030 | |
| P | 0 to 0.020 | |
| Ni | 0 to 0.010 | |
| Al | 0 to 0.0050 | |
| res. | 0 to 0.060 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM B617: Standard Specification for Coin Silver Electrical Contact Alloy