UNS C34000 (CW600N) Leaded Brass
C34000 brass is a brass formulated for primary forming into wrought products. CW600N is the EN numeric designation for this material. C34000 is the UNS number. Additionally, the EN chemical designation is CuZn35Pb1. And the British Standard (BS) designation is CZ118.
The properties of C34000 brass include seven common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C34000 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
100 GPa 15 x 106 psi
Poisson's Ratio
0.31
Rockwell B Hardness
53 to 91
Rockwell Superficial 30T Hardness
52 to 78
Shear Modulus
40 GPa 5.8 x 106 psi
Tensile Strength: Ultimate (UTS)
340 to 650 MPa 49 to 95 x 103 psi
Thermal Properties
Latent Heat of Fusion
170 J/g
Maximum Temperature: Mechanical
120 °C 260 °F
Melting Completion (Liquidus)
930 °C 1700 °F
Melting Onset (Solidus)
890 °C 1630 °F
Specific Heat Capacity
380 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
120 W/m-K 67 BTU/h-ft-°F
Thermal Expansion
21 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
26 % IACS
Electrical Conductivity: Equal Weight (Specific)
29 % IACS
Otherwise Unclassified Properties
Base Metal Price
24 % relative
Density
8.1 g/cm3 510 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
45 MJ/kg 19 x 103 BTU/lb
Embodied Water
320 L/kg 38 gal/lb
Common Calculations
Stiffness to Weight: Axial
7.1 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
11 to 22 points
Strength to Weight: Bending
13 to 21 points
Thermal Diffusivity
37 mm2/s
Thermal Shock Resistance
11 to 22 points
Alloy Composition
Among wrought copper alloys, the composition of C34000 brass is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity.
| Cu | 62 to 65 | |
| Zn | 33 to 37.2 | |
| Pb | 0.8 to 1.5 | |
| Fe | 0 to 0.1 | |
| res. | 0 to 0.4 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B453: Standard Specification for Copper-Zinc-Lead Alloy (Leaded-Brass) Rod, Bar, and Shapes
ASTM B121: Standard Specification for Leaded Brass Plate, Sheet, Strip, and Rolled Bar
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001