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EN CC767S (CuZn38AI-C) Aluminum Brass

CC767S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC767S is the EN numeric designation for this material. CuZn38AI-C is the EN chemical designation.

It has a fairly low base cost among cast brasses. In addition, it has a fairly high ductility and a fairly high electrical conductivity.

The graph bars on the material properties cards below compare CC767S 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


Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

34 %

Poisson's Ratio


Shear Modulus

40 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

430 MPa 62 x 103 psi

Tensile Strength: Yield (Proof)

150 MPa 21 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

120 °C 260 °F

Melting Completion (Liquidus)

840 °C 1540 °F

Melting Onset (Solidus)

790 °C 1460 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

110 W/m-K 61 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

32 % IACS

Electrical Conductivity: Equal Weight (Specific)

36 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative


8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

100 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

34 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among cast copper alloys, the composition of CC767S brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 58 to 64
Zinc (Zn) 32.8 to 41.9
Nickel (Ni) 0 to 1.0
Aluminum (Al) 0.1 to 0.8
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.5
Silicon (Si) 0 to 0.2
Tin (Sn) 0 to 0.1
Lead (Pb) 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