Aluminium Bronze – Copper Alloy UNS C62500

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Welding
     Forging
     Hot 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 C62500 copper alloy has good corrosion resistance. It is also commonly available as rod and flat products.

The following datasheet gives details about the UNS C62500 copper alloy.

Chemical Composition

The following table shows the chemical composition of UNS C62500 copper alloys.

Element Content (%)
Copper, Cu 82.7
Aluminium, Al 12.5-13.5
Iron, Fe 3.5-5.0
Manganese, Mn ≤2.0
Other ≤0.5

Physical Properties

The physical properties of UNS C62500 copper alloys are given in the following table.

Properties Metric Imperial
Density 7.21 g/cc 0.260 lb/in³
Melting point 1047°C 1917°F

Mechanical Properties

The mechanical properties of UNS C62500 copper alloys are tabulated below.

Properties Metric Imperial
Hardness, Rockwell C 27 27
Tensile strength (M30 and O61 tempers) 690 MPa 100000 psi
Yield strength (M30 and O61 tempers) 380 MPa 55100 psi
Elongation at break (in 50 mm, 1% reduction in area) 1.00% 1.00%
Elastic modulus 117 GPa 17000 ksi
Compressive yield strength (at permanent set of 0.1%) 450 MPa 65300 psi
Compressive yield strength (at permanent set of 1%) 880 MPa 128000 psi
Poisson’s ratio 0.34 0.34
Charpy impact (@ 18.0 - 100°C/ -0.400 - 212°F, keyhole) 3.00 J 2.21 ft-lb
Izod impact (@ 18.0 - 100°C/ -0.400 - 212°F) 3.00 J 2.21 ft-lb
Fatigue strength (@# of cycles 1.00e+8, M30 temper) 460 MPa 66700 psi
Machinability (UNS C36000 (free-cutting brass) = 100) 20 20
Shear modulus 42.3 GPa 6140 ksi

Thermal Properties

The thermal properties of UNS C62500 copper alloys are outlined in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@ 20-300°C/68-572°F) 16.2 µm/m°C 9.00 µin/in°F
Thermal conductivity (@ 20°C/ 68°F) 38.9 W/mK 270 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

The machinability rating of the UNS C62500 copper alloy is 20.

Welding

The UNS C62500 copper alloy can be welded using coated metal arc welding, brazing, gas shielded arc welding, seam welding, spot welding, and butt welding methods. It is suggested that soldering and oxyacetylene welding techniques should not be used for welding these alloys.

Forging

UNS C62500 copper alloys can be forged at temperature ranging from 746 to 844°C (1375 to 1550°F). Hot forgeability rate of UNS C62500 copper alloys is 80.

Hot Working

UNS C62500 has good hot forming capacity.

Annealing

Annealing of UNS C62500 can be performed at temperatures ranging from 594 to 650°C (1100 to 1200°F).

Applications

The copper alloy UNS C6240 are used in pump and valve components for industrial process streams, high strength fasteners, marine equipment, and pole line hardware.

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