Copper Alloy (UNS C91100)

Jul 17 2013

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
Applications

Introduction

Copper UNS C91100 is a casting alloy. Casting is a manufacturing process that has been in use for around 6000 years and involves pouring of molten metal into a mold to form a part. Many of the copper alloys are known for their good castability, as well as their good corrosion resistance, ductility, formability,

The following datasheet discusses the chemical composition and properties of copper UNS C91100.

Chemical Composition

The chemical composition of copper UNS C91100 is given in the following table.

Element Content (%)
Copper, Cu 84
Tin, Sn 16

Physical Properties

The following table discusses the physical properties of copper UNS C91100.

Properties Metric Imperial
Density 8.9 g/cm3 0.323 lb/in3
Melting point – (solidus) 818°C 1505°F
Melting point – (liquidus) 950°C 1742°F

Mechanical Properties

The mechanical properties of copper UNS C91100 are tabulated below.

Properties Metric Imperial
Tensile strength 241 MPa 35 ksi
Yield strength 172 MPa 25 ksi
Modulus of elasticity in tension 103400 MPa 15000 ksi
Poisson’s ratio 0.34 0.34
Elongation 2% 2%
Hardness (HB) 135 135

Other Designations

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Other designations that are equivalent to copper UNS C91100 include:

  • ASTM B22
  • ASTM B30

Fabrication

Machinability - The machinability of copper UNS C91100 alloy is rated at 10.

Welding - Soldering is the best method to use for welding copper UNS C91100, while brazing can provide good results. Oxyacetylene welding, carbon arc welding, gas shielded arc welding, and coated metal arc welding are rated as fair.

Heat Treatment - Copper UNS C91100 does not respond to heat treatment. The stress relieving temperature is 260°C (500°F), and the time at temperature is 1 h/in of section thickness.

Applications

Copper UNS C91100 finds application in:

  • Hollow conductors
  • Bushings
  • Bearings
  • Piston rings.

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