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EN CC750S (CuZn33Pb2-C) Leaded Brass

CC750S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC750S is the EN numeric designation for this material. CuZn33Pb2-C is the EN chemical designation.

It has a very low tensile strength among cast brasses. In addition, it has a moderately low ductility and a moderately low melting temperature.

The graph bars on the material properties cards below compare CC750S 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

54

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

13 %

Poisson's Ratio

0.31

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

200 MPa 29 x 103 psi

Tensile Strength: Yield (Proof)

80 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

860 °C 1580 °F

Melting Onset (Solidus)

810 °C 1490 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

110 W/m-K 63 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

24 % IACS

Electrical Conductivity: Equal Weight (Specific)

26 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.8 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)

22 MJ/m3

Resilience: Unit (Modulus of Resilience)

30 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

6.8 points

Strength to Weight: Bending

9.3 points

Thermal Diffusivity

35 mm2/s

Thermal Shock Resistance

6.7 points

Alloy Composition

Among cast copper alloys, the composition of CC750S 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) 62 to 67
Zinc (Zn) 26.3 to 36
Lead (Pb) 1.0 to 3.0
Tin (Sn) 0 to 1.5
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.8
Manganese (Mn) 0 to 0.2
Aluminum (Al) 0 to 0.1
Silicon (Si) 0 to 0.050
Phosphorus (P) 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