Jewellery Bronze UNS C22600

Nov 12 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Forging
     Hot Working
     Cold Working
     Annealing
Applications

Introduction

UNS C22600 jewellery bronze is an alloy of copper and zinc. It has similar characteristics as that of UNS C22000 bronze alloy. Yet it is stronger than C22000 bronze alloy. The following section will discuss in detail about UNS C22600 jewellery bronze, which is UNS C22600 copper-zinc brass.

Chemical Composition

The following table shows the chemical composition of UNS C22600 copper alloys.

Element Content (%)
Cu 87.5
Zn 12.5

Physical Properties

The physical properties of UNS C22600 copper alloys are given in the following table.

Properties Metric Imperial
Melting point - liquidus 1035°C 1895°F
Melting point - solidus 1004°C 1840°F
Density (@20°C/68°F) 8.77 g/cm3 0.317 lb/in3

Mechanical Properties

The mechanical properties of UNS C22600 copper alloys are tabulated below.

Properties Conditions
T (°C) Treatment
Poisson's ratio 0.34 25 -
Elastic modulus 117 GPa 25 -
Tensile strength 269-669 MPa - -
Yield strength 76-427 MPa 25 (flat products, wire)
Elongation 46% - -

Other Designations

Other designations that are equivalent to UNS C22600 copper alloys include:

  • ASTM B36

Fabrication and Heat Treatment

Machinability

The machinability rating of C22600 copper alloys is 30.

Welding

Welding methods such as soldering, brazing, oxyacetylene welding, gas shielded arc welding, spot welding and butt welding are preferred for C22600 copper alloys. Coated metal arc welding and seam welding are not preferred for this type of alloys.

Forging

C22600 copper alloys are forged at temperatures ranging from 760 to 899°C (1400 to 1650°F).

Hot Working

C22600 copper alloys have good hot working property.

Cold Working

C22600 copper alloys have good cold working property.

Annealing

Annealing of C22600 copper alloys is performed at temperatures ranging from 427 to 760°C (800 to 1400°F).

Applications

The following are the major applications of UNS C22600 copper alloys:

  • Cold-formed electrical and hardware components
  • Jewellery
  • Decorative chain
  • Dezincification-resistant fasteners
  • Fittings

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