Manganese Bronze – Copper Casting Alloy UNS C86200

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding

Introduction

Manganese bronze – copper casting alloy UNS C86200 consists primarily of of copper, zinc, aluminium and manganese bronze. Manganese existing in UNS C86200 provides an attractive chocolate brown color which is commonly used in architecture. The presence of lead in the alloy improves the longevity of the alloy.

The following datasheet provides chemical composition and properties of UNS C86200 copper alloy.

Chemical Composition

The chemical composition of UNS C86200 is given in the following table.

Element Content (%)
Copper, Cu 60.0-68.0
Zinc, Zn 26.0
Aluminium, Al 3.0-7.5
Manganese, Mn 2.5-5.0
Iron, Fe 2.0-4.0
Nickel ≤1.0
Lead, Pb ≤0.2
Tin, Sn ≤0.2

Physical Properties

The following table details the physical properties of copper alloy UNS C86200.

Properties Metric Imperial
Density 7.90 g/cc 0.285 lb/in³

Mechanical Properties

The mechanical properties of UNS C86200 are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 180 180
Tensile strength 655 MPa 95000 psi
Yield strength 330 MPa 47900 psi
Elongation at break 20.00% 20.00%
Machinability 30 30
Compressive strength 345 MPa 50000 psi
Izod impact 16.0 J 11.8 ft-lb

Thermal properties

The following table discusses the thermal properties of copper alloy UNS C86200.

Properties Metric Imperial
Thermal expansion co-efficient (@20-260°C/68-500°F) 22.0 µm/m°C 12.2 µin/in°F
Thermal conductivity (@20°C/68°F) 35.0 W/mK 243 BTUin/hr.ft².°F

Other Designations

Equivalent designations to UNS C86200 include:

  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B584
  • ASTM B763
  • QQ C390
  • QQ C523
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

Copper alloy UNS C86200 has a machinability rating of 30.

Welding

The preferred welding techniques for UNS C86200 are oxyacetylene welding, gas shielded arc welding and coated metal arc welding. Carbon arc welding, soldering and brazing are not recommended for this alloy.

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