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UNS C86800 Nickel-Manganese Bronze

C86800 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly low base cost among cast bronzes. In addition, it has a moderately high ductility and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare C86800 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 16 x 106 psi

Elongation at Break

22 %

Poisson's Ratio

0.31

Shear Modulus

42 GPa 6.1 x 106 psi

Tensile Strength: Ultimate (UTS)

570 MPa 82 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

140 °C 280 °F

Melting Completion (Liquidus)

900 °C 1650 °F

Melting Onset (Solidus)

880 °C 1620 °F

Specific Heat Capacity

400 J/kg-K 0.094 BTU/lb-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

51 MJ/kg 22 x 103 BTU/lb

Embodied Water

320 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

310 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

18 points

Alloy Composition

Among cast copper alloys, the composition of C86800 bronze is notable for containing comparatively high amounts of iron (Fe) and nickel (Ni). Iron is used to increase strength inexpensively. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting.

Copper (Cu) 53.5 to 57
Zinc (Zn) 28.3 to 40.5
Manganese (Mn) 2.5 to 4.0
Nickel (Ni) 2.5 to 4.0
Iron (Fe) 1.0 to 2.5
Aluminum (Al) 0 to 2.0
Tin (Sn) 0 to 1.0
Lead (Pb) 0 to 0.2
Residuals 0 to 1.0

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

Followup Questions

Similar Alloys

Further Reading

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015