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UNS C85700 Leaded Naval Brass

C85700 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C85700 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 6C, but this is now discouraged.

It has a moderately high melting temperature among the cast brasses in the database.

The graph bars on the material properties cards below compare C85700 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

100 GPa 15 x 106 psi

Elongation at Break

17 %

Poisson's Ratio

0.31

Shear Modulus

40 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

310 MPa 45 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

910 °C 1680 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

84 W/m-K 49 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

22 % IACS

Electrical Conductivity: Equal Weight (Specific)

25 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

47 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

41 MJ/m3

Resilience: Unit (Modulus of Resilience)

59 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

11 points

Strength to Weight: Bending

13 points

Thermal Diffusivity

27 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Among cast copper alloys, the composition of C85700 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) 58 to 64
Zinc (Zn) 32 to 40
Lead (Pb) 0.8 to 1.5
Tin (Sn) 0.5 to 1.5
Nickel (Ni) 0 to 1.0
Aluminum (Al) 0 to 0.8
Iron (Fe) 0 to 0.7
Silicon (Si) 0 to 0.050
Residuals 0 to 1.3

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

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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