Copper Casting Alloy UNS C87500

Sep 13 2012

Topics Covered

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

Introduction

Copper casting alloy UNS C87500 is an alloy of copper and silicon. Brass is a preferred alloy for architecture. Brass has attractive color and can be moulded into different shapes.

The following datasheet provides chemical composition and properties of UNS C87500 alloy.

Chemical Composition

The chemical composition of UNS C87500 alloy is given in the following table.

Element Content (%)
Cu 82
Zn 14
Si 4

Physical Properties

The following table details the physical properties of UNS C87500 alloy.

Properties Metric Imperial
Density 8.28 g/cm3 0.299 lb/in³

Mechanical Properties

The mechanical properties of UNS C87500 alloy are shown in the following table.

Properties Metric Imperial
Elastic modulus 117 GPa 16969 ksi
Poisson's ratio 0.34 0.34
Hardness, Brinell 134 134
Hardness Rockwell B 83 83
Tensile strength 460 MPa 66700 psi
Yield strength 205 MPa 29700 psi
Elongation at break 21.00% 21.00%
Machinability 50 50
Creep strength 9.50 MPa 1380 psi
Compressive strength 183 MPa 26500 psi
Charpy impact 43.0 J 31.7 ft.lb
Fatigue strength 150 MPa 21800 psi

Thermal properties

The following table discusses thermal properties of UNS C87500 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@75°C/167°F) 17.1 µm/m°C 9.50 µin/in°F
Thermal conductivity( @20°C/68°F) 26.0 W/mK 180 BTUin/hr.ft².°F

Other Designations

Equivalent designations to UNS C87500 alloy include:

  • ASTM B271
  • ASTM B30
  • ASTM B584
  • ASTM B763
  • ASTM B806
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Machinability

UNS C87500 alloy has a machinability rating of 50.

Welding

The preferred welding techniques for UNS C87500 alloy are brazing, oxyacetylene welding and gas shielded arc welding. Carbon arc welding, coated metal arc welding and soldering are not recommended for this alloy.

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