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EN CC755S (CuZn39Pb1AIB-C) Leaded Brass

CC755S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC755S is the EN numeric designation for this material. CuZn39Pb1AIB-C is the EN chemical designation.

It has a fairly low base cost among cast brasses. In addition, it has a very low melting temperature and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare CC755S 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

110

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

9.5 %

Poisson's Ratio

0.31

Shear Modulus

40 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

390 MPa 57 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

820 °C 1510 °F

Melting Onset (Solidus)

780 °C 1440 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

120 W/m-K 68 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

30 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.1 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

33 MJ/m3

Resilience: Unit (Modulus of Resilience)

290 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

38 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among cast copper alloys, the composition of CC755S brass is notable for containing a comparatively high amount of lead (Pb) and including manganese (Mn). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 59.5 to 61
Zinc (Zn) 35.8 to 38.9
Lead (Pb) 1.2 to 1.7
Aluminum (Al) 0.4 to 0.7
Tin (Sn) 0 to 0.3
Iron (Fe) 0.050 to 0.2
Nickel (Ni) 0 to 0.2
Manganese (Mn) 0 to 0.050
Silicon (Si) 0 to 0.050

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

Followup Questions

Similar Alloys

Further Reading

EN 1982: Copper and copper alloys - Ingots and castings