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UNS C86200 Manganese Bronze

C86200 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C86200 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 8B, but this is now discouraged.

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

The graph bars on the material properties cards below compare C86200 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

21 %

Poisson's Ratio

0.32

Shear Modulus

42 GPa 6.2 x 106 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

350 MPa 50 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

940 °C 1730 °F

Melting Onset (Solidus)

900 °C 1650 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

35 W/m-K 20 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.0 g/cm3 500 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 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

540 kJ/m3

Stiffness to Weight: Axial

7.8 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

23 points

Alloy Composition

Among cast copper alloys, the composition of C86200 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) 60 to 66
Zinc (Zn) 22 to 28
Aluminum (Al) 3.0 to 4.9
Manganese (Mn) 2.5 to 5.0
Iron (Fe) 2.0 to 4.0
Nickel (Ni) 0 to 1.0
Tin (Sn) 0 to 0.2
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

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

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