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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

Silver (Ag)Ag 89.6 to 91
Copper (Cu)Cu 9.0 to 10.4
Zinc (Zn)Zn 0 to 0.060
Iron (Fe)Fe 0 to 0.050
Cadmium (Cd)Cd 0 to 0.050
Lead (Pb)Pb 0 to 0.030
Phosphorus (P)P 0 to 0.020
Nickel (Ni)Ni 0 to 0.010
Aluminum (Al)Al 0 to 0.0050
Residualsres. 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