Admiralty Copper Alloy - CDA 443

Element

Composition (%)

Copper (Cu)

70.0 - 73.0

Zinc (Zn)

Rem.

Tin (Sn)

0.9 - 1.2

Lead (Pb)

0.07 max

Iron (Fe)

0.06 max

Arsenic (As)

0.02 - 0.06

Property

Value

Specific Gravity

8.47

Electrical Conductivity

16.23% IACS (calculated from resistivity)

Electrical Volume Resistivity

6.16e-8 ohm.m

Thermal Conductivity

121 W/m.K

Coefficient of Thermal Expansion

20.9 μstrain/°C

Specific Heat Capacity

0.377 J/g.K

Modulus of Elasticity (Tensile)

96.1 GPa

Modulus of Rigidity (Shear)

36.3 GPa

Property

Value

Tensile Strength

53 ksi (typical)

Yield Strength (0.5% Extension)

22 ksi (typical)

Elongation

65% (typical)

Rockwell Hardness F Scale

75 (typical)

Rockwell Hardness 30T Scale

37 (typical)

Modulus of Elasticity (Tensile)

96.1 GPa

Modulus of Rigidity (Shear)

36.3 GPa

Property

Value

Melting Point (Liquidus)

1720°F (938°C)

Melting Point (Solidus)

1650°F (899°C)

Thermal Conductivity

64 Btu/sq ft/ft hr/°F at 68°F (111 W/m·K at 20°C)

Coefficient of Thermal Expansion (68-572°F)

11.2 × 10⁻⁶ per °F (20.2 × 10⁻⁶ per °C)

Specific Heat Capacity

0.09 Btu/lb/°F at 68°F (377 J/kg·K at 20°C)

Annealing Temperature Range

800-1100°F (427-593°C)

Hot Working Temperature Range

1200-1450°F (649-788°C)

Property

Characteristic

Machinability

Good (Rating: 60)

Cold Working

Fair

Hot Working

Excellent

Soldering

Excellent

Brazing

Excellent

Oxyacetylene Welding

Good

Gas Shielded Arc Welding

Good

Coated Metal Arc Welding

Not Recommended

Resistance Welding (Spot and Seam)

Not Recommended

Butt Welding

Fair

Annealing Temperature Range

800-1100°F (427-593°C)

Hot Working Temperature Range

1200-1450°F (649-788°C)