Leaded Bronze UNS C31400

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Cold Working
     Welding
     Machinability
     Hot Working
Applications

Introduction

UNS C31400 alloys are a type of bronze alloys that are characterized by moderate corrosion resistance. Other types of bronze alloys include:

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

The datasheet given below provides an overview of UNS C31400 leaded bronze alloys.

Chemical Composition

The chemical composition of UNS C31400 leaded bronze alloys is outlined in the following table.

Element Content (%)
Cu 89.0
Pb 1.75
Zn 9.25

Physical Properties

The following table shows the physical properties of UNS C31400 leaded bronze alloys.

Properties Metric Imperial
Density 8.83 g/cc 0.319 lb/in³
Melting point 1010°C 1850°F

Mechanical Properties

The mechanical properties of UNS C31400 leaded bronze alloys are displayed in the following table.

Properties Metric Imperial
Tensile strength (depending on temper) 255-414 MPa 37000-60000 psi
Yield strength (depending on temper) 83.0-379 MPa 12000-55000 psi
Elongation at break (in 254 mm) 45.00% 45.00%
Modulus of elasticity 117 GPa 16969 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 80 80
Shear modulus 45.0 GPa 6530 ksi

Thermal Properties

The thermal properties of UNS C31400 leaded bronze alloys are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 18.4 µm/m°C 10.2 µin/in°F
Thermal conductivity (@20°C/68°F) 180 W/mK 1250 BTU in/hr.ft².°F

Other Designations

Equivalent materials to UNS C31400 leaded bronze alloys are:

  • ASTM B140
  • MIL V-18436

Fabrication and Heat Treatment

Annealing

UNS C31400 leaded bronze alloys are annealed between 427 and 649°C (800 and 1200°F).

Cold Working

UNS C31400 alloys have good cold working capacity.

Welding

Welding processes that can be used for UNS C31400 alloys include brazing, butt welding and soldering. Welding processes not recommended for these alloys include seam welding, coated metal arc welding, oxyacetylene welding, spot welding and gas shielded arc welding.

Machinability

UNS C31400 leaded bronze alloys have a machinability rating of 80.

Hot Working

UNS C31400 alloys have poor hot forming capacity.

Applications

UNS C31400 leaded bronze alloys are used for fasteners, pole line hardware and architectural hardware.

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