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UNS C53800 Leaded Phosphor Bronze

C53800 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the H08 (spring) temper. It has the highest base cost among wrought bronzes. In addition, it has the lowest melting temperature and the lowest heat capacity.

The graph bars on the material properties cards below compare C53800 bronze to: wrought bronzes (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

Elongation at Break

2.3 %

Poisson's Ratio


Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

470 MPa 69 x 103 psi

Tensile Strength: Ultimate (UTS)

830 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

660 MPa 95 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

980 °C 1800 °F

Melting Onset (Solidus)

800 °C 1470 °F

Specific Heat Capacity

360 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

61 W/m-K 35 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

37 % relative


8.7 g/cm3 550 lb/ft3

Embodied Carbon

3.9 kg CO2/kg material

Embodied Energy

64 MJ/kg 28 x 103 BTU/lb

Embodied Water

420 L/kg 50 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 MJ/m3

Resilience: Unit (Modulus of Resilience)

2020 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

19 mm2/s

Thermal Shock Resistance

31 points

Alloy Composition

Among wrought copper alloys, the composition of C53800 bronze is notable for including manganese (Mn) and tin (Sn). Manganese is used to improve strength without a proportional reduction in ductility. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Copper (Cu)Cu 85.1 to 86.5
Tin (Sn)Sn 13.1 to 13.9
Lead (Pb)Pb 0.4 to 0.6
Zinc (Zn)Zn 0 to 0.12
Manganese (Mn)Mn 0 to 0.060
Nickel (Ni)Ni 0 to 0.030
Iron (Fe)Fe 0 to 0.030
Residualsres. 0 to 0.2

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

Followup Questions

Similar Alloys