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UNS C27400 (CW508L) Yellow Brass

C27400 brass is a brass formulated for primary forming into wrought products. CW508L is the EN numeric designation for this material. C27400 is the UNS number. Additionally, the EN chemical designation is CuZn37. And the common industry name is 63-37 Yellow Brass.

The properties of C27400 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 C27400 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 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)

370 to 650 MPa 54 to 95 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

920 °C 1680 °F

Melting Onset (Solidus)

870 °C 1600 °F

Specific Heat Capacity

390 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

28 % IACS

Electrical Conductivity: Equal Weight (Specific)

31 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

45 MJ/kg 20 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

20 points

Strength to Weight: Axial

13 to 23 points

Strength to Weight: Bending

14 to 21 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

12 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C27400 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) 61 to 64
Zinc (Zn) 35.6 to 39
Iron (Fe) 0 to 0.1
Lead (Pb) 0 to 0.050
Residuals 0 to 0.3

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

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