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Full-Hard ASTM B780 Silver-Copper-Nickel Alloy

Full-hard ASTM B780 alloy is ASTM B780 alloy in the full-hard temper. It has the second highest strength and second lowest ductility compared to the other variants of ASTM B780 alloy.

The graph bars on the material properties cards below compare full-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

2.3 %

Poisson's Ratio


Shear Modulus

30 GPa 4.4 x 106 psi

Shear Strength

280 MPa 41 x 103 psi

Tensile Strength: Ultimate (UTS)

490 MPa 71 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

70 % IACS

Electrical Conductivity: Equal Weight (Specific)

62 % IACS

Common Calculations

Stiffness to Weight: Axial

4.5 points

Stiffness to Weight: Bending

14 points

Strength to Weight: Axial

13 points

Strength to Weight: Bending

14 points

Thermal Shock Resistance

24 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