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Oxygen Free Copper - CDA 103

Oxygen Free Copper (CDA 103) is a high-purity copper alloy with added phosphorus to improve its resistance to hydrogen embrittlement. It offers good conductivity and is used in specific high-temperature and vacuum applications.

Chemical Composition

Element 

Composition

Copper                            

99.95 min (incl.Ag)

Lead  

0.005% max

Bismuth                 

0.0010% max

Total Imps

0.03% max (excl. O2 & Ag)

Physical Properties

Property

Value

Density

8.89 to 8.94 g/cm³

Melting Point

1083°C (1981°F)

Electrical Conductivity

101% IACS (minimum)

Thermal Conductivity

399 W/m·°C

Specific Heat

385 J/kg·K

Thermal Expansion Coefficient (20-200°C)

17.3 × 10⁻⁶ /°C

Electrical Resistivity

0.017 microhm·m

Modulus of Elasticity

118,000 N/mm²

Mechanical Properties

Property

Value

Elastic (Young's) Modulus

120 GPa (17 × 10⁶ psi)

Elongation at Break

1.5% to 50%

Poisson's Ratio

0.34

Rockwell F Hardness

40 to 100

Rockwell Superficial 30T Hardness

27 to 70

Shear Modulus

43 GPa (6.3 × 10⁶ psi)

Shear Strength

150 to 240 MPa (22 to 34 × 10³ psi)

Tensile Strength: Ultimate (UTS)

222 to 385 MPa (32 to 56 × 10³ psi)

Tensile Strength: Yield (Proof)

60 to 325 MPa (8.7 to 47 × 10³ psi)

Thermal Properties

Property

Value

Melting Point

1083°C (1981°F)

Specific Heat

385 J/kg·K

Thermal Conductivity

399 W/m·°C

Thermal Expansion Coefficient (20-200°C)

17.3 × 10⁻⁶ /°C

Fabrication Properties

Property

Value

Hot Working Temperature Range

750-950°C

Hot Formability

Good

Cold Formability

Excellent

Cold reduction between anneals

95% max.

Machinability rating (free cutting brass = 100)

20%

Annealing Temp.

Range 200-650°C

Stress Relieving Temp

Range 150-200°C

Common Applications

Common Applications of Oxygen Free Copper (CDA 103):

  • High-temperature applications
  • Vacuum tube components
  • Electrical conductors in hydrogen environments
  • Heat exchangers
  • Cryogenic equipment
  • Brazing and welding materials
  • Aerospace components requiring hydrogen resistance

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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