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UNS C47940 Naval Brass

C47940 brass is a brass formulated for primary forming into wrought products. It has a moderately low melting temperature among the wrought brasses in the database.

The properties of C47940 brass include six 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 C47940 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

14 to 34 %

Poisson's Ratio


Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

250 to 310 MPa 36 to 45 x 103 psi

Tensile Strength: Ultimate (UTS)

380 to 520 MPa 55 to 75 x 103 psi

Tensile Strength: Yield (Proof)

160 to 390 MPa 23 to 57 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

850 °C 1570 °F

Melting Onset (Solidus)

800 °C 1480 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

110 W/m-K 64 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

25 % relative


8.2 g/cm3 510 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 40 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

68 to 100 MJ/m3

Resilience: Unit (Modulus of Resilience)

120 to 740 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

13 to 17 points

Strength to Weight: Bending

14 to 17 points

Thermal Diffusivity

36 mm2/s

Thermal Shock Resistance

13 to 17 points

Alloy Composition

Among wrought copper alloys, the composition of C47940 brass is notable for including tin (Sn) and containing a comparatively high amount of lead (Pb). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media. Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Copper (Cu)Cu 63 to 66
Zinc (Zn)Zn 28.1 to 34.6
Tin (Sn)Sn 1.2 to 2.0
Lead (Pb)Pb 1.0 to 2.0
Iron (Fe)Fe 0.1 to 1.0
Nickel (Ni)Ni 0.1 to 0.5
Residualsres. 0 to 0.4

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

Followup Questions

Similar Alloys

Further Reading

ASTM B21: Standard Specification for Naval Brass Rod, Bar, and Shapes

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