Copper Alloy (UNS C95300)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
     Heat Treatment


There are almost 400 types of copper alloys available with unique characteristics. Aluminum bronze is an alloy consisting of about 6% of iron and nickel and 9 to 12% of aluminum. It has high corrosion and wear resistance and good strength.

The following datasheet will discuss about UNS C95300 copper casting alloy, which is heat treatable.

Chemical Composition

The following table shows chemical composition of UNS C95300 copper alloy.

Element Content (%)
Copper, Cu 89
Aluminum, Al 10
Iron, Fe 1

Physical Properties

The physical properties of UNS C95300 copper alloy are tabulated below.

Properties Metric Imperial
Density 7.53 g/cm3 0.272 lb/in3
Melting point 1040 - 1045°C 1900 - 1913°F

Mechanical Properties

The mechanical properties of UNS C95300 copper alloy are outlined in the following table.

Mechanical Properties Metric Imperial
Tensile strength, ultimate (as cast) 450 MPa 65300 psi
Yield strength, (as cast) 170 MPa 24700 psi
Poisson's ratio 0.314 0.314
Elongation at break (as cast, in 50 mm) 20% 20%
Reduction of area (as cast) 25% 25%
Modulus of elasticity 110 GPa 16000 ksi
Shear modulus 42 GPa 6090 ksi
Hardness, Brinell (as cast; 3000 kg) 140 140
Hardness, Rockwell B (as cast) 67 67
Machinability (UNS C36000 (free-cutting brass) = 100) 55 55

Thermal Properties

The thermal properties of UNS C95300 copper alloy are given in the following table.

Thermal Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 16.2 µm/m°C 9 µin/in°F
Thermal conductivity (@20°C/68°F) 63 W/mK 437 BTU in/hr.ft2.°F

Other Designations

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Other designations that are equivalent to UNS C95300 copper alloy include:

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



The machinability rating of UNS C95300 copper alloy is 55.


UNS C95300 copper alloy can be welded using soldering, brazing, carbon arc welding, gas shielded arc welding and coated metal arc welding. Oxyacetylene welding is not preferred for this type of alloys.

Heat Treatment

UNS C95300 copper alloy is stress relieved at 316°C (600°F). The time taken for stress relieving is about 1 h/in. of section thickness. This alloy is unresponsive to heat treatment. The solution heat treating temperature of this alloy is from 860 to 890°C (1585 to 1635°F). The time taken for solution heat treating is 1 h/in of section thickness, and the quenching medium is water.


The following are the major applications of UNS C95300 copper alloy:

  • Electrical applications
  • Pickling baskets
  • Nuts
  • Gears
  • Steel mill slippers
  • Marine equipment
  • Welding jaws
  • Non-sparking hardware.

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