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
0.31
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
Density
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.
| Cu | 63 to 66 | |
| Zn | 28.1 to 34.6 | |
| Sn | 1.2 to 2.0 | |
| Pb | 1.0 to 2.0 | |
| Fe | 0.1 to 1.0 | |
| Ni | 0.1 to 0.5 | |
| res. | 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