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UNS C24000 (CW503L) Low Brass

C24000 brass is a brass formulated for primary forming into wrought products. CW503L is the EN numeric designation for this material. C24000 is the UNS number. Additionally, the EN chemical designation is CuZn20. The British Standard (BS) designation is CZ103. And the common industry name is 80-20 Low Brass.

It has a moderately high thermal conductivity among the wrought brasses in the database.

The properties of C24000 brass include nine 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 C24000 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

Poisson's Ratio

0.32

Rockwell B Hardness

52 to 91

Rockwell Superficial 30T Hardness

51 to 78

Shear Modulus

42 GPa 6.0 x 106 psi

Tensile Strength: Ultimate (UTS)

310 to 640 MPa 44 to 93 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

1000 °C 1830 °F

Melting Onset (Solidus)

970 °C 1770 °F

Solidification (Pattern Maker's) Shrinkage

5.5 %

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

140 W/m-K 81 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

32 % IACS

Electrical Conductivity: Equal Weight (Specific)

34 % IACS

Otherwise Unclassified Properties

Base Metal Price

27 % relative

Density

8.5 g/cm3 530 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

43 MJ/kg 19 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

10 to 21 points

Strength to Weight: Bending

12 to 20 points

Thermal Diffusivity

43 mm2/s

Thermal Shock Resistance

10 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C24000 brass is notable for containing comparatively high amounts of iron (Fe) and lead (Pb). Iron is used to increase strength inexpensively. Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Copper (Cu) 78.5 to 81.5
Zinc (Zn) 18.2 to 21.5
Iron (Fe) 0 to 0.050
Lead (Pb) 0 to 0.050
Residuals 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

ASTM B134: Standard Specification for Brass Wire

ASTM B36: Standard Specification for Brass Plate, Sheet, Strip, And Rolled Bar

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