Leaded Tin Bronze – Copper Casting Alloy UNS C92500

Topics Covered

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

Introduction

Bronze alloys are many in number and they include:

  • Phosphor bronze
  • Tin bronze
  • Aluminum bronze
  • Silicon bronze
  • Architectural bronze
  • Manganese bronze

The UNS C92500 alloy is a leaded tin bronze copper casting alloy. The datasheet given below provides an overview of the UNS C92500 alloy.

Chemical Composition

The chemical composition of the UNS C92500 leaded tin bronze copper casting alloy is outlined in the following table.

Element Content (%)
Copper, Cu 85.0-88.0
Tin, Sn 10.0-12.0
Lead, Pb 1.0-1.50
Nickel, Ni 0.80-1.50
Zinc, Zn 0.50
Phosphorus, P 0.20-0.30
Iron, Fe 0.15
Aluminium, Al 0.0050

Physical Properties

The following table shows the physical properties of the UNS C92500 alloy.

Properties Metric Imperial
Density 8.80 g/cm³ 0.318 lb/in³

Mechanical Properties

The mechanical properties of the UNS C92500 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Brinell 80 80
Tensile strength 305 MPa 44200 psi
Yield strength (@strain 0.500%) 140 MPa 20300 psi
Elongation at break (in 50 mm) 20.00% 20.00%
Machinability 30 30
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Other Designations

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Equivalent materials to the UNS C92500 alloy are:

  • ASTM B30
  • ASTM B505
  • QQ C390
  • SAE J461
  • SAE J462

Fabrication and Heat Treatment

Welding

Welding processes suitable for the UNS C92500 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 the UNS C92500 copper alloy is 30.

Heat Treatment

UNS C92500 can be stress relieved at 260°C (500°F), with a hold time of one hour per inch (25mm) of section thickness. This alloy does not react to heat treatment.

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