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UNS C86500 Manganese Bronze

C86500 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C86500 is the UNS number for this material. Additionally, the common industry name is No. 1 Manganese Bronze. Older literature may refer to this material as ASTM Alloy 8A, but this is now discouraged.

It has a very low base cost among cast bronzes. In addition, it has a very high electrical conductivity and a fairly high thermal conductivity.

The graph bars on the material properties cards below compare C86500 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

25 %

Poisson's Ratio

0.3

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

530 MPa 76 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 28 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

880 °C 1620 °F

Melting Onset (Solidus)

860 °C 1580 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

86 W/m-K 50 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

23 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

180 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

28 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among cast copper alloys, the composition of C86500 bronze is notable for containing a comparatively high amount of iron (Fe) and including manganese (Mn). Iron is used to increase strength inexpensively. Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 55 to 60
Zinc (Zn) 36 to 42
Iron (Fe) 0.4 to 2.0
Aluminum (Al) 0.5 to 1.5
Manganese (Mn) 0.1 to 1.5
Nickel (Ni) 0 to 1.0
Tin (Sn) 0 to 1.0
Lead (Pb) 0 to 0.4
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

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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