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.
| Cu | 53.5 to 57 | |
| Zn | 28.3 to 40.5 | |
| Mn | 2.5 to 4.0 | |
| Ni | 2.5 to 4.0 | |
| Fe | 1.0 to 2.5 | |
| Al | 0 to 2.0 | |
| Sn | 0 to 1.0 | |
| Pb | 0 to 0.2 | |
| res. | 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