Aluminium Bronze – Copper Alloy UNS C62400

Topics Covered

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

Introduction

Aluminium bronze is an alloy, which consist of about 6% of nickel and iron, and 9 to 12% of aluminium. It has a golden color. The UNS C62400 copper alloy has high corrosion resistance, and good strength, and can be heat treated to improve/modify their properties.

The following datasheet gives an overview of the UNS C62400 copper alloy.

Chemical Composition

The following table shows the chemical composition of the UNS C62400 copper alloy.

Element Content (%)
Copper, Cu 82.8-88.0
Aluminium, Al 10.0-11.5
Iron, Fe 2.0-4.5
Manganese, Mn ≤0.3
Silicon, Si ≤0.25
Tin, Sn ≤0.2
Other ≤0.5

Physical Properties

The physical properties of the UNS C62400 copper alloy are tabulated below.

Properties Metric Imperial
Density 7.45 g/cc 0.269 lb/in³
Melting point 1027°C 1880°F

Mechanical Properties

The mechanical properties of copper alloy UNS C62400 are given in the following table.

Properties Metric Imperial
Hardness, Rockwell B 92 92
Tensile strength 655 MPa 95000 psi
Yield strength 330 MPa 47900 psi
Elongation at break (in 50 mm, 11% reduction in area) 14% 14%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Charpy Impact (@ -23.0-27.0°C/ -9.40-80.6°F, keyhole) 15.0 J 11.1 ft-lb
Izod impact (@ -23.0-27.0°C/ -9.40-80.6°F) 23.0 J 17.0 ft-lb
Fatigue strength (@# of cycles 1.00e+8, reverse bending) 235 MPa 34100 psi
Machinability (UNS C36000 (free-cutting brass) = 100) 50 50
Shear modulus 44 GPa 6380 ksi

Thermal Properties

The thermal properties of the UNS C62400 copper alloy are outlined in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-300°C/ 68-572°F) 16.5 µm/m°C 9.17 µin/in°F
Thermal conductivity (@ 20°C/ 68°F) 58.6 W/mK 407 BTU in/hr.ft.²°F

Other Designations

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Other designations that are equivalent to the UNS C62400 copper alloy include:

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

Fabrication and Heat Treatment

Machinability

The machinability rating of the UNS C62400 copper alloy is 50.

Welding

The UNS C62400 copper alloy can be welded using brazing, gas shielded arc welding, spot welding, butt welding, seam welding, and coated metal arc welding methods. Soldering, and oxyacetylene welding are not preferred for this alloy.

Forging

Copper alloy UNS C62400 can be forged at temperatures ranging from 760 to 885°C (1400 to 1625°F). The hot forgeability rating of the UNS C62400 copper alloy is 80.

Hot Working

The UNS C62400 copper alloy has good hot forming capacity.

Cold Working

UNS C62400 has poor cold working capacity.

Annealing

Annealing of copper alloy UNS C62400 can be performed at temperatures between 594 and 650°C (1100 and 1200°F).

Applications

Aluminium bronze alloy UNS C62400 is used in pump and valve components for industrial process streams, high strength fasteners, marine equipment, and pole line hardware.

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