Aluminium Bronze UNS C95400 – Copper Alloy

Topics Covered

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

Introduction

Aluminium bronzes are copper alloys, that contain about 5 to 12% of aluminium. In addition, aluminium bronzes also contain nickel, silicon, manganese, and iron. They are found in wrought and cast form. Due to the presence of hard, adherent, protective alumina film, they are stronger than that of brasses or tin bronzes. They have high corrosion resistance, and are golden in color.

Chemical Composition

The following table shows chemical composition of UNS C95400 copper alloy.

Element Content (%)
Cu 85
Fe 4
Al 11

Physical Properties

The physical properties of UNS C95400 copper alloy are tabulated below:

Properties Metric Imperial
Density 7.45 g/cm3 0.269 lb/in3
Melting point 1025 - 1040°C 1877 - 1900°F

Mechanical Properties

The following table shows mechanical properties of C95400 copper alloy.

Properties Metric Imperial
Hardness, Brinell ( as cast; 3000 kg) 170 170
Hardness, Brinell(TQ50 temper; 3000 kg) 195 195
Hardness, Rockwell B (as cast) 83 83
Hardness, Rockwell B (TQ50 temper) 94 94
Tensile strength, ultimate (as cast) 515 MPa 74700 psi
Tensile strength, ultimate (TQ50 temper) 620 MPa 89900 psi
Tensile strength, yield ( as cast) 205 MPa 29700 psi
Tensile strength, yield(TQ50 temper) 310 MPa 45000 psi
Elongation at break (TQ50 temper, in 50 mm) 8% 8%
Elongation at break (as cast, in 50 mm) 12% 12%
Reduction of area (TQ50 temper) 6% 6%
Reduction of area (as cast) 12% 12%
Creep strength (for 10E-5%/h, at 425°C) 20.0 MPa 2900 psi
Creep strength (for 10E-5%/h, at 370°C) 30.0 MPa 4350 psi
Creep strength (for 10-E5%/h, at 315°C) 51.0 MPa 7400 psi
Creep strength (for 10E-5%/h, at 230°C) 115 MPa 16700 psi
Modulus of Elasticity 110 GPa 16000 ksi
Compressive strength ( as cast) 940 MPa 136000 psi
Compressive strength (TQ50 temper) 1070 MPa 155000 psi
Poisson’s ratio 0.316 0.316
Charpy impact (keyhole, TQ50 temper) 9.00 J 6.64 ft-lb
Charpy impact (keyhole, as cast) 15.0 J 11.1 ft-lb
Izod impact (TQ50 temper) 15.0 J 11.1 ft-lb
Izod impact (as cast) 22.0 J 16.2 ft-lb
Fatigue strength (@# of cycles 1.00e+8 , reverse bending) 240 MPa 34800 psi
Machinability (UNS C36000 (free-cutting brass) = 100%) 60% 60%
Shear modulus 41.0 GPa 5950 ksi

Thermal Properties

The thermal properties of UNS C95400 copper alloy are outlined in the following table.

Properties Metric Imperial
CTE, linear (@ 20.0 - 300°C/68.0 - 572°F) 16.2 μm/m°C 9.00 μin/in°F
Specific heat capacity 0.420 J/g°C 0.100 BTU/lb°F
Thermal conductivity (@ 20.0°C/68.0°F) 59.0 W/m-K 409 BTU-in/hr-ft2 °F
Solidus 1025°C 1877°F
Liquidus 1040°C 1900°F

Other Designations

Other designations that are equivalent to UNS C95400 copper alloy include:

  • ASME SB148
  • ASME SB271
  • ASTM B148
  • ASTM B271
  • ASTM B30
  • ASTM B505
  • ASTM B763
  • ASTM B806
  • MIL C-11866
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

The machinability of UNS C95400 copper alloy is about 60%.

Welding

Soldering, carbon arc welding, brazing, coated metal arc welding, and gas shielded arc welding are most commonly used methods for welding UNS C95400 copper alloy.

Heat Treatment

UNS C95400 copper alloy is heated at a temperature of about 870 to 910°C (1600 to 1675°F). Stress is relieved at a temperature of about 316°C (600°F). It is then quenched in water.

Annealing

UNS C95400 copper alloy is annealed at 620 to 660°C (1150 to 1225°F). The time taken for annealing is about 1 hr/in. of section thickness.

Applications

Aluminium bronzes are used in sea water applications that include:

  • Bearings
  • Pipe fittings
  • Pumps and valve components
  • Fasteners
  • Heat exchangers

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