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EN CC751S (CuZn33Pb2Si-C) Leaded Brass

CC751S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC751S is the EN numeric designation for this material. CuZn33Pb2Si-C is the EN chemical designation.

It has the lowest ductility and a moderately low melting temperature among cast brasses.

The graph bars on the material properties cards below compare CC751S 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

130

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

5.6 %

Poisson's Ratio

0.31

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

450 MPa 65 x 103 psi

Tensile Strength: Yield (Proof)

320 MPa 46 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

850 °C 1570 °F

Melting Onset (Solidus)

810 °C 1490 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

110 W/m-K 64 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

28 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

8.1 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)

23 MJ/m3

Resilience: Unit (Modulus of Resilience)

480 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

35 mm2/s

Thermal Shock Resistance

15 points

Alloy Composition

Among cast copper alloys, the composition of CC751S 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) 62.7 to 66
Zinc (Zn) 27.9 to 35.6
Lead (Pb) 0.8 to 2.2
Silicon (Si) 0.65 to 1.1
Nickel (Ni) 0 to 0.8
Tin (Sn) 0 to 0.8
Iron (Fe) 0.25 to 0.5
Antimony (Sb) 0 to 0.5
Manganese (Mn) 0 to 0.15
Aluminum (Al) 0 to 0.1

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