Spring-Tempered ASTM B617 Coin Silver Alloy
Spring-tempered ASTM B617 is ASTM B617 coin silver in the spring temper. It has the highest strength compared to the other variants of ASTM B617 coin silver. The graph bars on the material properties cards below compare spring-tempered 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
1.1 %
Poisson's Ratio
0.37
Shear Modulus
28 GPa 4.0 x 106 psi
Shear Strength
290 MPa 42 x 103 psi
Tensile Strength: Ultimate (UTS)
520 MPa 75 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
14 points
Strength to Weight: Bending
14 points
Thermal Shock Resistance
25 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