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UNS C55280 (BCuP-6) Filler Metal

C55280 copper is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BCuP-6 is the AWS designation for this material. C55280 is the UNS number.

It has a moderately low tensile strength among the copper-based braze fillers in the database.

The graph bars on the material properties cards below compare C55280 copper to: copper-based braze fillers (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

110 GPa 16 x 106 psi

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

180 MPa 26 x 103 psi

Thermal Properties

Brazing Temperature

730 to 820 °C 1350 to 1500 °F

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

790 °C 1450 °F

Melting Onset (Solidus)

640 °C 1190 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Expansion

16 µm/m-K

Otherwise Unclassified Properties

Density

8.5 g/cm3 530 lb/ft3

Embodied Carbon

4.2 kg CO2/kg material

Embodied Energy

67 MJ/kg 29 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

6.9 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

5.9 points

Strength to Weight: Bending

8.3 points

Thermal Shock Resistance

7.4 points

Alloy Composition

Copper (Cu) 90.5 to 91.4
Phosphorus (P) 6.8 to 7.2
Silver (Ag) 1.8 to 2.2
Residuals 0 to 0.15

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

Followup Questions

Similar Alloys

Further Reading

AWS A5.8: Specification for Filler Metals for Brazing and Braze Welding