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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.

Copper (Cu) 78 to 82
Zinc (Zn) 10 to 16
Tin (Sn) 4.0 to 6.0
Lead (Pb) 2.0 to 3.0
Phosphorus (P) 0 to 1.5
Nickel (Ni) 0 to 0.8
Iron (Fe) 0 to 0.4
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.080
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 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