Aluminium Nickel Bronze UNS C62400 – Copper Alloy

Topics Covered

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

Introduction

Aluminium bronzes are alloys of copper with a composition of 5 to 12% of aluminum. Aluminium bronzes contain nickel, silicon, manganese, and iron as well. They are present in wrought and cast form. The presence of hard, adherent, protective alumina film in the alloys contributes to their strength which is greater than that of brasses or tin bronzes. They are anti-corrosive in nature and are found in golden color that does not tarnish much with time.

Chemical Composition

The chemical composition of UNS C62400 copper alloy is shown in the table below.

Element Content (%)
Cu 86.0
Fe 3.0
Al 11.0

Physical Properties

The following table shows the physical properties of UNS C62400 copper alloy.

Properties Metric Imperial
Density 7.45 (g/cm3) 0.269 (lb/in3)
Melting point 982°C 1800°F

Mechanical Properties

The mechanical properties of C62400 copper alloy is given below.

Properties Metric Imperial
Hardness, Rockwell B 92 92
Tensile strength, ultimate 655 MPa 95000 psi
Tensile strength, yield 330 MPa 47900 psi
Elongation at break 14.00% 14.00%
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Other Designation

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Equivalent designations to aluminium nickel bronze UNS C62400 include:

  • UNS C62400
  • ASME SFA5.7
  • ASTM B150
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rating of UNS C62400 copper alloy is about 50% whereas that of Alloy 360 FC Brass is 100%.

Welding

The following are the welding recommendations for UNS C62400:

  • Soldering - not recommended
  • Brazing - fair
  • Oxyacetylene - not recommended
  • Gas shielded arc welding – good
  • Coated metal arc welding – good
  • Spot welding – good
  • Seam welding – good
  • Butt welding

Forging

The hot forgeability rating of UNS C62400 is 80%. The recommended hot working temperature for this alloy is 760 and 885ºC (1400 and 1625ºF).

Annealing

UNS C62400 copper alloy is annealed at 593 to 648ºC (1100 to 1200°F).

Hot working

UNS C62400 copper alloys have excellent hot working property.

Cold Working

UNS C62400 copper alloys have poor cold working property.

Applications

Aluminium bronzes are mainly used in sea water applications that include:

  • Pumps and valve components
  • Marine equipment
  • High strength fasteners
  • Pole line hardware

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