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EN CC761S (CuZn16Si4-C) Silicon Brass

CC761S brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CC761S is the EN numeric designation for this material. CuZn16Si4-C is the EN chemical designation.

It has the lowest thermal conductivity among cast brasses. In addition, it has a very high electrical conductivity and a fairly low ductility.

The graph bars on the material properties cards below compare CC761S 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

150

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

8.7 %

Poisson's Ratio

0.33

Shear Modulus

42 GPa 6.1 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Tensile Strength: Yield (Proof)

340 MPa 50 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

960 °C 1760 °F

Melting Onset (Solidus)

910 °C 1670 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

27 W/m-K 16 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

40 % IACS

Electrical Conductivity: Equal Weight (Specific)

43 % IACS

Otherwise Unclassified Properties

Base Metal Price

27 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

41 MJ/m3

Resilience: Unit (Modulus of Resilience)

530 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

18 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

8.0 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among cast copper alloys, the composition of CC761S brass is notable for containing a comparatively high amount of silicon (Si) and including manganese (Mn). Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility. Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 78 to 83
Zinc (Zn) 8.9 to 19
Silicon (Si) 3.0 to 5.0
Nickel (Ni) 0 to 1.0
Lead (Pb) 0 to 0.8
Iron (Fe) 0 to 0.6
Tin (Sn) 0 to 0.3
Manganese (Mn) 0 to 0.2
Aluminum (Al) 0 to 0.1
Antimony (Sb) 0 to 0.050
Phosphorus (P) 0 to 0.030

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