UNS C33000 Leaded Brass
C33000 brass is a brass formulated for primary forming into wrought products. C33000 is the UNS number for this material. Additionally, the common industry name is 66-33.5-0.5.
The properties of C33000 brass include three 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 C33000 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
Elongation at Break
7.0 to 60 %
Poisson's Ratio
0.31
Rockwell F Hardness
64 to 75
Rockwell Superficial 30T Hardness
26 to 69
Shear Modulus
40 GPa 5.9 x 106 psi
Shear Strength
240 to 300 MPa 35 to 44 x 103 psi
Tensile Strength: Ultimate (UTS)
320 to 520 MPa 47 to 75 x 103 psi
Tensile Strength: Yield (Proof)
110 to 450 MPa 16 to 65 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
130 °C 270 °F
Melting Completion (Liquidus)
940 °C 1720 °F
Melting Onset (Solidus)
900 °C 1660 °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
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
26 % IACS
Electrical Conductivity: Equal Weight (Specific)
29 % IACS
Otherwise Unclassified Properties
Base Metal Price
24 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
2.7 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)
35 to 150 MJ/m3
Resilience: Unit (Modulus of Resilience)
60 to 950 kJ/m3
Stiffness to Weight: Axial
7.2 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
11 to 18 points
Strength to Weight: Bending
13 to 18 points
Thermal Diffusivity
37 mm2/s
Thermal Shock Resistance
11 to 17 points
Alloy Composition
Among wrought copper alloys, the composition of C33000 brass is notable for containing comparatively high amounts of lead (Pb) and iron (Fe). Lead is used to improve machinability and bearing properties, at the cost of toxicity. Iron is used to increase strength inexpensively.
| Cu | 65 to 68 | |
| Zn | 30.8 to 34.8 | |
| Pb | 0.25 to 0.7 | |
| Fe | 0 to 0.070 | |
| res. | 0 to 0.4 |
All values are % weight. Ranges represent what is permitted under applicable standards.