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UNS C84500 Leaded Semi-Red Brass

C84500 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately high ductility among cast brasses. In addition, it has a moderately low electrical conductivity and a moderately high base cost.

The graph bars on the material properties cards below compare C84500 brass to: cast brasses (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

Brinell Hardness

55

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

28 %

Poisson's Ratio

0.34

Shear Modulus

39 GPa 5.6 x 106 psi

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Tensile Strength: Yield (Proof)

97 MPa 14 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

150 °C 300 °F

Melting Completion (Liquidus)

980 °C 1790 °F

Melting Onset (Solidus)

840 °C 1540 °F

Specific Heat Capacity

360 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

72 W/m-K 42 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

16 % IACS

Electrical Conductivity: Equal Weight (Specific)

17 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.7 g/cm3 550 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

340 L/kg 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

54 MJ/m3

Resilience: Unit (Modulus of Resilience)

45 kJ/m3

Stiffness to Weight: Axial

6.6 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

7.7 points

Strength to Weight: Bending

9.8 points

Thermal Diffusivity

23 mm2/s

Thermal Shock Resistance

8.6 points

Alloy Composition

Among cast copper alloys, the composition of C84500 brass is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings.

Copper (Cu) 77 to 79
Zinc (Zn) 10 to 14
Lead (Pb) 6.0 to 7.5
Tin (Sn) 2.0 to 4.0
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.4
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.080
Phosphorus (P) 0 to 0.020
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.7

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

Followup Questions

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001

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