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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

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