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UNS C86700 Leaded Manganese Bronze

C86700 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very low base cost among cast bronzes. In addition, it has a fairly high thermal conductivity and a very high electrical conductivity.

The graph bars on the material properties cards below compare C86700 bronze to: cast bronzes (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

17 %

Poisson's Ratio

0.31

Shear Modulus

41 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

630 MPa 91 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

880 °C 1620 °F

Melting Onset (Solidus)

860 °C 1580 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Conductivity

89 W/m-K 52 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

17 % IACS

Electrical Conductivity: Equal Weight (Specific)

19 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

340 L/kg 40 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

86 MJ/m3

Resilience: Unit (Modulus of Resilience)

290 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

28 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among cast copper alloys, the composition of C86700 bronze is notable for containing comparatively high amounts of iron (Fe) and aluminum (Al). Iron is used to increase strength inexpensively. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.

Copper (Cu) 55 to 60
Zinc (Zn) 30 to 38
Manganese (Mn) 1.0 to 3.5
Iron (Fe) 1.0 to 3.0
Aluminum (Al) 1.0 to 3.0
Lead (Pb) 0.5 to 1.5
Tin (Sn) 0 to 1.5
Nickel (Ni) 0 to 1.0
Residuals 0 to 1.0

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

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

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