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Annealed ASTM B596 Gold-Copper Alloy

Annealed ASTM B596 is ASTM B596 Au-Cu in the annealed condition. The graph bars on the material properties cards below compare annealed ASTM B596 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

100 GPa 15 x 106 psi

Elongation at Break

17 %

Knoop Hardness


Poisson's Ratio


Shear Modulus

36 GPa 5.2 x 106 psi

Shear Strength

280 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

450 MPa 65 x 103 psi

Thermal Properties

Latent Heat of Fusion

77 J/g

Melting Completion (Liquidus)

1060 °C 1950 °F

Melting Onset (Solidus)

930 °C 1710 °F

Specific Heat Capacity

150 J/kg-K 0.037 BTU/lb-°F

Thermal Expansion

14 µm/m-K

Other Material Properties


18 g/cm3 1140 lb/ft3

Electrical Conductivity: Equal Volume

14 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.7 % IACS

Common Calculations

Stiffness to Weight: Axial

3.1 points

Stiffness to Weight: Bending

8.5 points

Strength to Weight: Axial

6.8 points

Strength to Weight: Bending

7.1 points

Thermal Shock Resistance

22 points

Alloy Composition

Gold (Au)Au 89 to 91
Copper (Cu)Cu 9.0 to 11
Residualsres. 0 to 0.4

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

Followup Questions

Further Reading

ASTM B596: Standard Specification for Gold-Copper Alloy Electrical Contact Material