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Half-Hard ASTM B780 Silver-Copper-Nickel Alloy

Half-hard ASTM B780 alloy is ASTM B780 alloy in the half-hard temper. The graph bars on the material properties cards below compare half-hard ASTM B780 alloy 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

83 GPa 12 x 106 psi

Elongation at Break

3.4 %

Poisson's Ratio


Shear Modulus

30 GPa 4.4 x 106 psi

Shear Strength

250 MPa 37 x 103 psi

Tensile Strength: Ultimate (UTS)

440 MPa 64 x 103 psi

Thermal Properties

Latent Heat of Fusion

140 J/g

Melting Completion (Liquidus)

860 °C 1580 °F

Specific Heat Capacity

270 J/kg-K 0.065 BTU/lb-°F

Thermal Expansion

18 µm/m-K

Other Material Properties


10 g/cm3 630 lb/ft3

Electrical Conductivity: Equal Volume

73 % IACS

Electrical Conductivity: Equal Weight (Specific)

65 % IACS

Common Calculations

Stiffness to Weight: Axial

4.5 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

13 points

Thermal Shock Resistance

21 points

Alloy Composition

Silver (Ag)Ag 74 to 76
Copper (Cu)Cu 23.5 to 25.7
Nickel (Ni)Ni 0.35 to 0.65
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

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Further Reading

ASTM B780: Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy