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UNS C85400 Leaded Yellow Brass

C85400 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C85400 is the UNS number for this material. Additionally, the common industry name is No.1 Yellow Brass. Older literature may refer to this material as ASTM Alloy 6B, but this is now discouraged.

It has a fairly low tensile strength and a fairly high melting temperature among cast brasses.

The graph bars on the material properties cards below compare C85400 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

Brinell Hardness

55

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

23 %

Poisson's Ratio

0.32

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

220 MPa 33 x 103 psi

Tensile Strength: Yield (Proof)

85 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

940 °C 1730 °F

Specific Heat Capacity

380 J/kg-K 0.090 BTU/lb-°F

Thermal Conductivity

89 W/m-K 51 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

20 % IACS

Electrical Conductivity: Equal Weight (Specific)

22 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

8.3 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)

40 MJ/m3

Resilience: Unit (Modulus of Resilience)

35 kJ/m3

Stiffness to Weight: Axial

7.0 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

7.5 points

Strength to Weight: Bending

9.9 points

Thermal Diffusivity

28 mm2/s

Thermal Shock Resistance

7.6 points

Alloy Composition

Among cast copper alloys, the composition of C85400 brass is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings.

Copper (Cu) 65 to 70
Zinc (Zn) 24 to 32
Lead (Pb) 1.5 to 3.8
Tin (Sn) 0.5 to 1.5
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.7
Aluminum (Al) 0 to 0.35
Silicon (Si) 0 to 0.050
Residuals 0 to 1.1

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