Copper (UNS C51800)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications

Introduction

The UNS numbers C50000 to C59999 indicate phosphor bronzes. They are a group of copper alloys with tin and phosphorus playing a bigger role.

Copper UNS C51800 is a wrought alloy. The following datasheet discusses the chemical composition and properties of copper UNS C51800.

Chemical Composition

The chemical composition of copper UNS C51800 is given in the following table.

Element Content (%)
Tin, Sn 4-6
Phosphorous, P 0.10-0.35
Lead, Pb 0.02
Copper, Cu Balance

Physical Properties

The following table discusses the physical properties of copper UNS C51800.

Properties Metric Imperial
Density 8.9 g/cm3 0.323 lb/in3
Melting point (solidus) 1060°C 1940°F

Mechanical Properties

The mechanical properties of copper UNS C51800 are tabulated below.

Properties Metric Imperial
Modulus of elasticity (@20°C/68°F) 121 GPa 17549 ksi
Poisson’s ratio 0.35 0.35

Thermal Properties

The thermal properties of copper UNS C51800 are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-392°F) 18 x 10-6 °C 10 x 10-6/°F
Thermal conductivity (@20°C/68°F) 93-96W/mK 35-56 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to copper UNS C51800 include:

  • ASME SFA5.21
  • ASME SFA5.7

Fabrication

Machinability - The machinability of copper UNS C51800 alloy is rated at 20.

Welding - Welding methods such as butt resistance welding, soldering and brazing are considered as excellent for this alloy. Gas shielded arc welding and spot resistance welding are rated as good while coated metal arc welding, seam resistance welding, and oxyacetylene welding are rated as fair.

Hot working - Copper UNS C51800 alloy has limited hot working abilities. The hot working temperature for this alloy ranges between 650 and 750 °C (1205 and 1382°F)

Cold working - Copper UNS C51800 alloy has excellent cold working properties.

Annealing - Copper UNS C51800 alloy is annealed at temperatures ranging between 500 – 700 °C (932 and 1292 ºF).

Applications

Copper UNS C51800 is used in the following areas:

  • Hardware applications - lock springs and fasteners
  • Electrical applications - terminal connectors, fuse clips, contacts, switch parts, and springs
  • Industrial application - sleeve bushings, diaphragms, bellows, and press tools
  • Engineering applications - clutch discs, lock washers, and bridge bearing plates

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