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UNS C36000 (CW603N) Free-Cutting Brass

C36000 brass is a brass formulated for primary forming into wrought products. CW603N is the EN numeric designation for this material. C36000 is the UNS number. Additionally, the EN chemical designation is CuZn36Pb3. And the British Standard (BS) designation is CZ124.

The properties of C36000 brass include three 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 C36000 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

5.8 to 23 %

Poisson's Ratio

0.31

Shear Modulus

39 GPa 5.7 x 106 psi

Shear Strength

210 to 310 MPa 31 to 45 x 103 psi

Tensile Strength: Ultimate (UTS)

330 to 530 MPa 48 to 77 x 103 psi

Tensile Strength: Yield (Proof)

140 to 260 MPa 20 to 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

900 °C 1650 °F

Melting Onset (Solidus)

890 °C 1630 °F

Specific Heat Capacity

380 J/kg-K 0.090 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

23 % relative

Density

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)

25 to 62 MJ/m3

Resilience: Unit (Modulus of Resilience)

89 to 340 kJ/m3

Stiffness to Weight: Axial

7.0 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

11 to 18 points

Strength to Weight: Bending

13 to 18 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

11 to 18 points

Alloy Composition

Among wrought copper alloys, the composition of C36000 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) 60 to 63
Zinc (Zn) 32.5 to 37.5
Lead (Pb) 2.5 to 3.7
Iron (Fe) 0 to 0.35
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B16: Standard Specification for Free-Cutting Brass Rod, Bar and Shapes for Use in Screw Machines

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993