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UNS C85200 Leaded Yellow Brass

C85200 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C85200 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 6A, but this is now discouraged.

It has a moderately high ductility and a fairly high melting temperature among cast brasses.

The graph bars on the material properties cards below compare C85200 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

28 %

Poisson's Ratio

0.32

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

270 MPa 39 x 103 psi

Tensile Strength: Yield (Proof)

95 MPa 14 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 290 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

930 °C 1700 °F

Specific Heat Capacity

380 J/kg-K 0.090 BTU/lb-°F

Thermal Conductivity

84 W/m-K 49 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

18 % IACS

Electrical Conductivity: Equal Weight (Specific)

19 % IACS

Otherwise Unclassified Properties

Base Metal Price

26 % relative

Density

8.4 g/cm3 520 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

59 MJ/m3

Resilience: Unit (Modulus of Resilience)

42 kJ/m3

Stiffness to Weight: Axial

7.0 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

8.9 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

27 mm2/s

Thermal Shock Resistance

9.3 points

Alloy Composition

Among cast copper alloys, the composition of C85200 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) 70 to 74
Zinc (Zn) 20 to 27
Lead (Pb) 1.5 to 3.8
Tin (Sn) 0.7 to 2.0
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.6
Antimony (Sb) 0 to 0.2
Silicon (Si) 0 to 0.050
Sulfur (S) 0 to 0.050
Phosphorus (P) 0 to 0.020
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.9

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

Followup Questions

Similar Alloys

Further Reading

ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings

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