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Admiralty Copper Alloy - CDA 443

Admiralty Copper Alloy (CDA 443) is a copper-zinc-tin alloy known for its excellent corrosion resistance, especially in marine and industrial environments. It contains small amounts of tin and arsenic, providing improved resistance to dezincification and stress corrosion cracking. This alloy is commonly used in heat exchangers and condenser tubes.

Chemical Composition

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

 

Physical Properties

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

Mechanical Properties

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

Thermal Properties

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)

Fabrication Properties

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)

Common Applications

Common applications of Admiralty Copper Alloy (CDA 443) include:

  • Heat exchanger and condenser tubes
  • Marine hardware and piping
  • Desalination plant equipment
  • Power plant condensers
  • Oil refinery and petrochemical applications

How Can Drawn Metal Help

If you have any queries about the metal products that we offer, don’t hesitate to get in touch with us. 

 

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