UNS C84200 Leaded Semi-Red Brass
C84200 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C84200 is the UNS number for this material. Additionally, the common industry name is 80-5-2-13.
It has a fairly high base cost among cast brasses. In addition, it has a fairly high embodied energy and a moderately low electrical conductivity.
The graph bars on the material properties cards below compare C84200 brass to: cast 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
15 %
Poisson's Ratio
0.33
Shear Modulus
40 GPa 5.8 x 106 psi
Tensile Strength: Ultimate (UTS)
250 MPa 37 x 103 psi
Tensile Strength: Yield (Proof)
120 MPa 18 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
150 °C 310 °F
Melting Completion (Liquidus)
990 °C 1820 °F
Melting Onset (Solidus)
840 °C 1540 °F
Specific Heat Capacity
370 J/kg-K 0.089 BTU/lb-°F
Thermal Conductivity
72 W/m-K 42 BTU/h-ft-°F
Thermal Expansion
19 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
16 % IACS
Electrical Conductivity: Equal Weight (Specific)
17 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
350 L/kg 42 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
31 MJ/m3
Resilience: Unit (Modulus of Resilience)
72 kJ/m3
Stiffness to Weight: Axial
6.9 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
8.2 points
Strength to Weight: Bending
10 points
Thermal Diffusivity
23 mm2/s
Thermal Shock Resistance
9.1 points
Alloy Composition
Among cast copper alloys, the composition of C84200 brass is notable for containing a comparatively high amount of lead (Pb) and including sulfur (S). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.
| Cu | 78 to 82 | |
| Zn | 10 to 16 | |
| Sn | 4.0 to 6.0 | |
| Pb | 2.0 to 3.0 | |
| P | 0 to 1.5 | |
| Ni | 0 to 0.8 | |
| Fe | 0 to 0.4 | |
| Sb | 0 to 0.25 | |
| S | 0 to 0.080 | |
| Si | 0 to 0.0050 | |
| Al | 0 to 0.0050 | |
| res. | 0 to 0.7 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B505: Standard Specification for Copper Alloy Continuous Castings
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001