Copper Alloy (UNS C87400)

Jul 9 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications

Introduction

UNS designations C87300 to C87900 are cast silicon brasses and bronzes. Copper UNS C87400 is a silicon brass cast alloy. Silicon brasses are high strength brasses that are solid solution strengthened. The cast silicon brasses possess very good aqueous and atmospheric corrosion resistance.

The following datasheet discusses the chemical composition and properties of copper UNS C87400.

Chemical Composition

The chemical composition of UNS C87400 copper alloy is outlined in the following table.

Element Content (%)
Copper, Cu 79
Zinc, Zn 12-16
Tin, Sn 2.5-4
Lead, Pb 0.1
Aluminum, Al 0.8

Physical Properties

The following table discusses the physical properties of copper UNS C87400.

Properties Metric Imperial
Density 8.3 g/cm3 0.300 lb/in3
Melting point (solidus) 821°C 1510°F
Melting point (liquidus) 916°C 1680°F

Mechanical Properties

The mechanical properties of copper UNS C87400 are tabulated below.

Properties Metric Imperial
Tensile strength 379 MPa 55000 ksi
Yield strength 165 MPa 23900 ksi
Modulus of elasticity 106 GPa 15400 ksi
Poisson’s ratio 0.34 0.34
Elongation 30% 30%
Hardness, Brinell 70 70
Machinability 50 50

Thermal Properties

The thermal properties of copper UNS C87400 are tabulated below.

Properties Metric Imperial
Thermal conductivity 27.7 W/mK 192 BTU in/hr.ft2.°F

Other Designations

Other designations that are equivalent to copper UNS C87400 include:

  • ASTM B584
  • ASTM B271
  • ASTM B30
  • ASTM B198-13A

Fabrication

Welding: Brazing, oxyacetylene welding, and gas shielded arc welding are rated as fair for copper UNS C87400, while. Soldering and coated metal arc welding are not recommended.

Applications

Copper UNS C87400 finds application in:

  • Gears
  • Clamps
  • Bearings
  • Impellers
  • Rocker arms
  • Valve stems
  • Hexagonal nuts
  • Artistry components
  • Electrical components

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