Copper Casting Alloy UNS C87300

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal properties
Other Designations


Copper casting alloy UNS C87300 is a cast alloy of copper and silicon. Brasses have attractive color and can be shaped according to the architects’ need.

The following datasheet provides chemical composition and properties of UNS C87300 alloy.

Chemical Composition

The chemical composition of UNS C87300 alloy is given in the following table.

Element Content (%)
Cu 94.0
Zn 0.25
Pb 0.20
Fe 0.20
Mn 0.80 - 1.50
Si 3.50 - 4.50

Physical Properties

The following table details the physical properties of UNS C87300 alloy.

Properties Metric Imperial
Density 8.36 g/cm3 0.302 lb/in³

Mechanical Properties

The mechanical properties of UNS C87300 alloy are shown in the following table.

Properties Metric Imperial
Compressive strength 125 MPa 18100 psi
Izod impact 45.0 J 33.2
Hardness, Brinell 85 85
Tensile strength 380 MPa 55100 psi
Yield strength 170 MPa 24700 psi
Elongation at break 30.00% 30.00%
Machinability 50 50

Thermal properties

The following table discusses the thermal properties of UNS C87300 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@20-260°C/68-500°F) 19.6 µm/m°C 10.9 µin/in°F
Thermal conductivity( @20°C/68°F) 28.0 W/mK 194 BTUin/hr.ft².°F

Other Designations

Equivalent designations to UNS C87300 alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B584
  • ASTM B763
  • MIL C-11866
  • QQ C390
  • SAE J461
  • SAE J462

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