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EN CR025A (Cu-DXP) Phosphorus-Deoxidized Copper

CR025A copper is a lightly alloyed grade of copper, formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CR025A is the EN numeric designation for this material. Cu-DXP is the EN chemical designation.

The graph bars on the material properties cards below compare CR025A copper to: cast coppers (top), all copper alloys (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

120 GPa 17 x 10⁶ psi

Elongation at Break

15 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.3 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

230 MPa 33 x 10³ psi

Tensile Strength: Yield (Proof)

140 MPa 20 x 10³ psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1090 °C 2000 °F

Melting Onset (Solidus)

1040 °C 1900 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

370 W/m-K 210 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

99 % IACS

Electrical Conductivity: Equal Weight (Specific)

99 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

9.0 g/cm³ 560 lb/ft³

Embodied Carbon

2.6 kg CO₂/kg material

Embodied Energy

41 MJ/kg 18 x 10³ BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

31 MJ/m³

Resilience: Unit (Modulus of Resilience)

83 kJ/m³

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

7.1 points

Strength to Weight: Bending

9.3 points

Thermal Diffusivity

110 mm²/s

Thermal Shock Resistance

8.1 points

Alloy Composition

Among cast copper alloys, the composition of CR025A copper is notable for including silver (Ag) and bismuth (Bi). Silver is used to increase recrystallization temperature in copper alloys. This permits operation at higher temperatures without permanent loss of mechanical properties. Bismuth improves machinability and pressure tightness. It is used a non-toxic but more expensive replacement for lead.