# EN CR017A (CuAg0.04(OF)) Silver-Bearing Oxygen-Free Copper

CR017A copper is a lightly alloyed grade of copper, formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CR017A is the EN numeric designation for this material. Additionally, the EN chemical designation is CuAg0,04(OF).

The graph bars on the material properties cards below compare CR017A 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 10 ^{6} psi*

Elongation at Break

15 *%*

Poisson's Ratio

0.34

Shear Modulus

43 *GPa* 6.3 *x 10 ^{6} psi*

Tensile Strength: Ultimate (UTS)

230 *MPa* 33 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

140 *MPa* 20 *x 10 ^{3} 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

32 *% relative*

Density

9.0 *g/cm ^{3}* 560

*lb/ft*

^{3}Embodied Carbon

2.6 *kg CO _{2}/kg material*

Embodied Energy

42 *MJ/kg* 18 *x 10 ^{3} BTU/lb*

Embodied Water

340 *L/kg* 41 *gal/lb*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

31 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

83 *kJ/m ^{3}*

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 *mm ^{2}/s*

Thermal Shock Resistance

8.1 *points*

## Alloy Composition

Among cast copper alloys, the composition of CR017A 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.

Cu | 99.944 to 99.97 | |

Ag | 0.030 to 0.050 | |

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