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UNS C44300 (CW706R) Admiralty Brass

C44300 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the O61 (annealed) temper. CW706R is the EN numeric designation for this material. C44300 is the UNS number. Additionally, the EN chemical designation is CuZn20Al2As. The British Standard (BS) designation is CZ111. And the common industry name is 71.5-27.5-1. Older literature may refer to this material as ASTM Admiralty Metal Type B, but this is now discouraged.

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

The graph bars on the material properties cards below compare C44300 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

Shear Modulus

41 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

350 MPa 51 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 17 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 290 °F

Melting Completion (Liquidus)

940 °C 1720 °F

Melting Onset (Solidus)

900 °C 1650 °F

Specific Heat Capacity

380 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

110 W/m-K 64 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

27 % IACS

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Unit (Modulus of Resilience)

65 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

13 points

Thermal Diffusivity

35 mm2/s

Thermal Shock Resistance

12 points

Alloy Composition

Among wrought copper alloys, the composition of C44300 brass is notable for including arsenic (As). Arsenic is used to protect the alloy against dezincification.

Copper (Cu) 70 to 73
Zinc (Zn) 25.2 to 29.1
Tin (Sn) 0.9 to 1.2
Arsenic (As) 0.020 to 0.060
Lead (Pb) 0 to 0.070
Iron (Fe) 0 to 0.060
Residuals 0 to 0.4

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

Followup Questions

Similar Alloys

Further Reading

ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001