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UNS C34200 (CW601N) Leaded Brass

C34200 brass is a brass formulated for primary forming into wrought products. CW601N is the EN numeric designation for this material. C34200 is the UNS number. Additionally, the EN chemical designation is CuZn35Pb2. And the British Standard (BS) designation is CZ131.

The properties of C34200 brass include six 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 C34200 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

Elongation at Break

3.0 to 17 %

Poisson's Ratio


Rockwell B Hardness

53 to 91

Rockwell Superficial 30T Hardness

52 to 78

Shear Modulus

40 GPa 5.7 x 106 psi

Shear Strength

230 to 360 MPa 33 to 52 x 103 psi

Tensile Strength: Ultimate (UTS)

370 to 650 MPa 54 to 95 x 103 psi

Tensile Strength: Yield (Proof)

150 to 420 MPa 22 to 62 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

910 °C 1670 °F

Melting Onset (Solidus)

890 °C 1630 °F

Specific Heat Capacity

380 J/kg-K 0.091 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


8.2 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

Resilience: Ultimate (Unit Rupture Work)

9.0 to 98 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 to 870 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

13 to 22 points

Strength to Weight: Bending

14 to 20 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

12 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C34200 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.

Copper (Cu) 62 to 65
Zinc (Zn) 32 to 36.5
Lead (Pb) 1.5 to 2.5
Iron (Fe) 0 to 0.1
Residuals 0 to 0.4

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

Followup Questions

Similar Alloys

Further Reading

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015