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UNS C37700 (CW612N) Forging Brass

C37700 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. CW612N is the EN numeric designation for this material. C37700 is the UNS number. Additionally, the EN chemical designation is CuZn39Pb2. And the British Standard (BS) designation is CZ122.

It has a moderately low tensile strength among the wrought brasses in the database.

The graph bars on the material properties cards below compare C37700 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

40 %

Poisson's Ratio

0.31

Rockwell B Hardness

45

Shear Modulus

39 GPa 5.7 x 106 psi

Shear Strength

270 MPa 40 x 103 psi

Tensile Strength: Ultimate (UTS)

400 MPa 58 x 103 psi

Tensile Strength: Yield (Proof)

160 MPa 23 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 240 °F

Melting Completion (Liquidus)

890 °C 1640 °F

Melting Onset (Solidus)

880 °C 1620 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

120 W/m-K 69 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

30 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.1 g/cm3 500 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)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

14 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

39 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among wrought copper alloys, the composition of C37700 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) 58 to 61
Zinc (Zn) 35.7 to 40.5
Lead (Pb) 1.5 to 2.5
Iron (Fe) 0 to 0.3
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

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