Phosphor Bronze – Copper Alloy UNS C51000

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

UNS C51000 phosphor bronze copper alloy has an excellent combination of ductility and strength and possess good spring qualities.

A few other bronze copper alloys excluding the phosphor bronze copper alloy include:

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

The addition of phosphor in bronze alloys results in increased 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.

The datasheet given below provides an overview of UNS C51000 phosphor bronze copper alloy.

Chemical Composition

The chemical composition of UNS C51000 phosphor bronze copper alloy is outlined in the following table.

Element Content (%)
Copper, Cu 95.0
Tin, Sn 5.0
Phosphorous, P trace

Physical Properties

The following table shows the physical properties of the UNS C51000 copper alloy.

Properties Metric Imperial
Density 8.86 g/cm3 0.320 lb/in³
Melting point 954°C 1750°F

Mechanical Properties

The mechanical properties of the UNS C51000 copper alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 324-965 MPa 47000-140000 psi
Yield strength (depending on temper) 131-552 MPa 19000-80100 psi
Elongation at break (in 50.8 mm) 64% 64%
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 the UNS C51000 copper alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 17.8 µm/m°C 9.89 µin/in°F
Thermal conductivity (@20°C/68°F) 84 W/mK 583 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to the UNS C51000 copper alloy are given in the table below.

  • AMS4720
  • ASTM B100
  • ASTM B103
  • ASTM B139
  • ASTMB159
  • ASTM F467
  • ASTM F468
  • MILB-13501
  • MIL W-6712
  • QQ W321
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Annealing

UNS C51000 copper alloy is annealed between 482 and 677°C (900 and 1250°F).

Cold Working

UNS C51000 copper alloy has excellent cold working capacity.

Welding

Welding processes suitable for UNS C51000 copper alloy include brazing, soldering, butt welding, seam welding, oxyacetylene welding, coated metal arc welding, spot welding and gas shielded arc welding.

Machinability

The machinability rating of UNS C51000 copper alloy is 20.

Hot Working

UNS C51000 copper alloy is rated with poor hot forming capacity.

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