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UNS C55281 (BCuP-3) Filler Metal

C55281 copper is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BCuP-3 is the AWS designation for this material. C55281 is the UNS number.

The graph bars on the material properties cards below compare C55281 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 15 x 106 psi

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

190 MPa 28 x 103 psi

Thermal Properties

Brazing Temperature

720 to 820 °C 1320 to 1500 °F

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

810 °C 1500 °F

Melting Onset (Solidus)

640 °C 1190 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Expansion

16 µm/m-K

Otherwise Unclassified Properties

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

7.0 kg CO2/kg material

Embodied Energy

110 MJ/kg 48 x 103 BTU/lb

Common Calculations

Stiffness to Weight: Axial

6.9 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

6.1 points

Strength to Weight: Bending

8.5 points

Thermal Shock Resistance

7.7 points

Alloy Composition

Copper (Cu) 88.5 to 89.4
Phosphorus (P) 5.8 to 6.2
Silver (Ag) 4.8 to 5.2
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

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993