Phosphor Bronze – Copper Alloy UNS C52100

Topics Covered

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

Introduction

Phosphor bronze alloys were of great significance in the Bronze Age. The addition of phosphor in bronze alloys increase wear resistance, fatigue resistance and hardness, thus allowing the usage of the phosphor bronze alloys in shafts, fasteners, valve spindles, masonry fixings, bearings, springs and gears.

Bronze copper alloys are available in different forms and some of them include:

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

UNS C52100 phosphor bronze copper alloy has good spring qualities, ductility and strength. The following datasheet provides an overview of UNS C52100 alloy.

Chemical Composition

The chemical composition of UNS C52100 phosphor bronze copper alloy is outlined in the following table.

Element Content (%)
Cu, Copper 92.0
Sn, Tin 8.0
P, Phosphorus trace

Physical Properties

The following table shows the physical properties of UNS C52100 phosphor bronze copper alloy.

Properties Metric Imperial
Density 8.80 g/cm3 0.318 lb/in³
Melting point 882°C 1620°F

Mechanical Properties

The mechanical properties of UNS C52100 phosphor bronze copper alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 379-965 MPa 55000-140000 psi
Yield strength (depending on temper) 165-552 MPa 23900-80100 psi
Elongation at break (in 50.8 mm) 70% 70%
Machinability (UNS C36000 (free-cutting brass) = 100) 20 20
Shear modulus 41 GPa 5950 ksi
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16969 ksi

Thermal Properties

The thermal properties of UNS C52100 phosphor bronze copper alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (20-300°C/68-572°F) 18.2 µm/m°C 10.1 µin/in°F
Thermal conductivity (20°C/68°F) 62 W/mK 430 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to UNS C52100 phosphor bronze copper alloy are:

  • ASME SFA5.7
  • ASTM B103
  • ASTM B139
  • ASTM B159
  • MIL E-23765/3
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Annealing

UNS C52100 alloy is annealed between 482 and 677°C (900 and 1250°F).

Cold Working

UNS C52100 alloy has good cold working capacity.

Welding

Welding processes that can be used for UNS C52100 alloy include oxyacetylene welding, butt welding, soldering, seam welding, brazing, spot welding, coated metal arc welding and gas shielded arc welding.

Machinability

The machinability rating of UNS C52100 alloy is 20.

Hot Working

UNS C52100 alloy has poor hot forming capacity.

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