Leaded Copper UNS C18700

Topics Covered

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

Introduction

UNS C18700 leaded copper alloys are primary alloys that can be spot welded and seam welded to achieve hardness and electrical conductivity of 96% IACS. These alloys can be heat treated and cold worked. They are suitable for applications, which require high mechanical properties and deformation resistance at high temperature.

The following datasheet will give an overview of UNS C18700 leaded copper alloys.

Chemical Composition

The following table shows the chemical composition of UNS C18700 copper alloys.

Element Content (%)
Cu, Copper 99.0
Pb, Lead 1.0

Physical Properties

The physical properties of UNS C18700 copper alloys are given in the following table.

Properties Metric Imperial
Density 8.89 g/cm3 0.321 lb/in3
Melting point 953°C 1747°F

Mechanical Properties

The mechanical properties of UNS C18700 copper alloys are tabulated below.

Properties Metric Imperial
Hardness, Rockwell B (50.8 - 76.2 mm/2.00 - 3.00 in) 65 65
Hardness, Rockwell B (25.4 - 50.8 mm/1.00 - 2.00 in) 70 70
Hardness, Rockwell B (25.4 mm/1.00 in, heat treated) 75.0 75.0
Tensile strength at break (any thickness) 379 MPa 55000 psi
Yield strength (0.500%, any thickness) 379 MPa 55000 psi
Modulus of elasticity 117 GPa 17000 ksi
Poisson's ratio 0.181 0.181
Shear modulus 49.6 GPa 7200 ksi

Thermal Properties

The thermal properties of UNS C18700 copper alloys are tabulated below.

Properties Metric Imperial
Thermal expansion coefficient (20.0 - 300°C/ 68.0 - 572°F) 17.6 µm/m°C 9.78 µin/in°F
Thermal conductivity (@20.0°C/ 68.0°F) 377 W/mK 2620 BTU in/hr.ft.°F

Other Designations

Other designations that are equivalent to UNS C18700 copper alloys include:

  • ASTM B301
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Machinability

The machinability rate of C18700 copper alloys is 85.

Welding

Welding methods such as soldering, brazing and butt welding are preferred for C18700 copper alloys. Oxyacetylene welding, gas shielded arc welding, coated metal arc welding, seam welding and spot welding are not preferred for this type of alloys.

Forging

C18700 copper alloys are forged at temperatures ranging from 760 to 871°C (1400 to 1600°F).

Hot Working

C18700 copper alloys have poor hot working property.

Cold Working

C18700 copper alloys have good cold working property.

Annealing

Annealing of C18700 copper alloys is performed at temperatures ranging from 427 to 649°C (800 to 1200°F).

Applications

The following are the major applications of UNS C18700 copper alloys:

  • Electrical/electronic connectors
  • Welding torch tips

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