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EN CR020A (Cu-PHC) Oxyben-Free Low-Phosphorus Copper

CR020A copper is a lightly alloyed grade of copper, formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CR020A is the EN numeric designation for this material. Cu-PHC is the EN chemical designation.

It has a moderately low tensile strength among the cast coppers in the database.

The graph bars on the material properties cards below compare CR020A 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)

220 MPa 32 x 103 psi

Tensile Strength: Yield (Proof)

130 MPa 19 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

380 W/m-K 220 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

100 % IACS

Electrical Conductivity: Equal Weight (Specific)

100 % 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)

29 MJ/m3

Resilience: Unit (Modulus of Resilience)

76 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

6.8 points

Strength to Weight: Bending

9.0 points

Thermal Diffusivity

110 mm2/s

Thermal Shock Resistance

7.8 points

Alloy Composition

Among cast copper alloys, the composition of CR020A 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.

Copper (Cu) 99.95 to 99.999
Silver (Ag) 0 to 0.015
Phosphorus (P) 0.0010 to 0.0060
Lead (Pb) 0 to 0.0050
Bismuth (Bi) 0 to 0.00050

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

Followup Questions

Similar Alloys

Further Reading

EN 1976: Copper and copper alloys - Cast unwrought copper products