Manganese Bronze – Copper Casting Alloy UNS C86300

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Heat Treatment


Manganese bronze – copper casting alloy UNS C86300 is an alloy that primarily consists of copper, zinc and aluminium.. The manganese present in UNS C86300 gives a chocolate brown color to the alloy. Copper casting alloy UNS C86300 is used in architecture for its longevity.

The following datasheet provides chemical composition and properties of UNS C86300.

Chemical Composition

The chemical composition of copper alloy UNS C86300 is given in the following table.

Element Content (%)
Copper, Cu 60.0-68.0
Zinc, Zn 25.0
Aluminium, Al 3.0-7.50
Manganese, Mn 2.5-5.0
Iron, Fe 2.0-4.0
Lead, Pb ≤0.2
Tin, Sn ≤0.2

Physical Properties

The following table details the physical properties of UNS C86300.

Properties Metric Imperial
Density 7.70 g/cc 0.278 lb/in³

Mechanical Properties

The mechanical properties of UNS C86300 copper alloy are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 225 225
Tensile strength 820 MPa 119000 psi
Yield strength 460 MPa 66700 psi
Elongation at break 18.00% 18.00%
Machinability 8 8

Other Designations

Equivalent designations to UNS C86300 include:

  • AMS 4860
  • ASTM B22
  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • MIL C-11866
  • QQ C390
  • QQ C523
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment


Copper alloy UNS C86300 has a machinability rating of 8.


The preferred welding technique for UNS C86300 is coated metal arc welding. Soldering, brazing, carbon arc welding, oxyacetylene welding and gas shielded arc welding are not recommended for this alloy.

Heat Treatment

Copper casting alloy UNS C86300 does not respond to heat treatment.

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