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UNS C55180 (BCuP-1) Filler Metal

C55180 copper is a copper-based filler metal for brazing. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. BCuP-1 is the AWS designation for this material. C55180 is the UNS number.

It has a moderately low embodied energy among the copper-based braze fillers in the database.

The graph bars on the material properties cards below compare C55180 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

Elongation at Break

20 %

Poisson's Ratio

0.34

Shear Modulus

41 GPa 6.0 x 106 psi

Tensile Strength: Ultimate (UTS)

200 MPa 29 x 103 psi

Tensile Strength: Yield (Proof)

100 MPa 15 x 103 psi

Thermal Properties

Brazing Temperature

790 to 930 °C 1450 to 1700 °F

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

920 °C 1700 °F

Melting Onset (Solidus)

710 °C 1310 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

200 W/m-K 110 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.6 g/cm3 540 lb/ft3

Embodied Carbon

2.5 kg CO2/kg material

Embodied Energy

39 MJ/kg 17 x 103 BTU/lb

Embodied Water

290 L/kg 35 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

34 MJ/m3

Resilience: Unit (Modulus of Resilience)

48 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

6.4 points

Strength to Weight: Bending

8.8 points

Thermal Diffusivity

56 mm2/s

Thermal Shock Resistance

7.9 points

Alloy Composition

Copper (Cu) 94.7 to 95.2
Phosphorus (P) 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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015