Copper Casting Alloy UNS C92800

Sep 13 2012

Topics Covered

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

Introduction

Copper alloys are available in more than 400 varieties. Each copper alloy variety has specific properties that suit a number of manufacturing processes, environments and applications. Some of the copper alloy forms include:

  • Beryllium copper
  • Nickel silver
  • Tin bronze
  • Brass
  • Phosphor bronze
  • Gunmetal
  • Aluminum bronze
  • Copper-nickel

UNS C92800 alloy is a copper casting alloy. The following datasheet provides an overview of UNS C92800 alloy.

Chemical Composition

The chemical composition of UNS C92800 alloy is outlined in the following table.

Element Content (%)
Cu 79
Sn 16
Pb 5

Physical Properties

The following table shows the physical properties of the UNS C92800 alloy.

Properties Metric Imperial
Density 8.81 g/cm3 0.318 lb/in³

Mechanical Properties

The mechanical properties of UNS C92800 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Rockwell B 80 80
Tensile strength (as cast) 276 MPa 40000 psi
Yield strength (as cast) 207 MPa 30000 psi
Elongation at break (as cast) 1.00% 1.00%
Machinability (UNS C36000 (free-cutting brass) = 100) 70 70
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Other Designations

Equivalent materials to UNS C92800 alloy are:

  • ASTM B30
  • ASTM B505

Fabrication and Heat Treatment

Welding

Welding process suitable for UNS C92800 alloy include brazing and soldering. Welding processes not recommended for this alloy include gas shielded arc welding, carbon arc welding, coated metal arc welding and oxyacetylene welding.

Machinability

The machinability rating of UNS C92800 alloy is 70.

Heat Treatment

UNS C92800 alloy has stress relieving temperature of 260°C (500°F). This alloy does not react to heat treatment. The time at temperature for this alloy is one hour per inch of section thickness.

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