Nickel Manganese Bronze – Copper Alloy UNS C86800

Nov 13 2012

Topics Covered

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

Introduction

Nickel manganese bronze – copper alloy UNS C86800 is a cast alloy of manganese bronze and leaded manganese bronze. The UNS C86800 alloy gets its color from the lead and manganese present in the alloy. UNS C86800 alloy is used in architecture for its long lasting luster.

The following datasheet provides chemical composition and properties of UNS C86800 alloy alloy.

Chemical Composition

The chemical composition of UNS C86800 alloy is given in the following table.

Element Content (%)
Cu 55
Zn 37
Ni 3
Fe 2
Mn 3

Physical Properties

The following table details the physical properties of UNS C86800 alloy.

Properties Metric Imperial
Density 8.00 g/cm³ 0.289 lb/in³

Mechanical Properties

The mechanical properties of UNS C86800 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 80 80
Tensile strength 565 MPa 81900 psi
Yield strength 260 MPa 37700 psi
Elongation at break 22.00% 22.00%
Machinability 30 30

Other Designations

Equivalent designations to UNS C86800 alloy include:

  • QQ C390

Fabrication and Heat Treatment

Machinability

UNS C86800 alloy has a machinability rating of 55.

Welding

The preferred welding techniques for UNS C86800 alloy are soldering and brazing. Carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding are not recommended for this alloy.

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