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UNS C69400 Silicon Red Brass

C69400 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the H04 (full hard) temper.

It has a moderately low thermal conductivity among wrought brasses. In addition, it has a moderately low electrical conductivity and a moderately low melting temperature.

The graph bars on the material properties cards below compare C69400 brass to: wrought 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

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

17 %

Poisson's Ratio

0.33

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

350 MPa 51 x 103 psi

Tensile Strength: Ultimate (UTS)

570 MPa 83 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 40 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

920 °C 1680 °F

Melting Onset (Solidus)

820 °C 1510 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

26 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.7 % 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

44 MJ/kg 19 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

80 MJ/m3

Resilience: Unit (Modulus of Resilience)

340 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

7.7 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among wrought copper alloys, the composition of C69400 brass is notable for including silicon (Si). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Copper (Cu) 80 to 83
Zinc (Zn) 11.5 to 16.5
Silicon (Si) 3.5 to 4.5
Lead (Pb) 0 to 0.3
Iron (Fe) 0 to 0.2
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B371: Standard Specification for Copper-Zinc-Silicon Alloy Rod

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001