Fire-Refined Tough Pitch with Silver Copper UNS C12900

Aug 6 2012

Topics Covered

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

Introduction

The UNS numbers C10100 to C13000 indicate pure copper. Pure copper is used in applications requiring high electrical and thermal conductivity. Oxygen free coppers are exceptionally ductile and anti-corrosive in nature. The following datasheet discusses the chemical composition and properties of fire-refined tough pitch with silver copper UNS C12900.

Chemical Composition

The chemical composition of the silver copper UNS C12900 is given in the following table.

Element Content (%)
Cu 99.88
Ag 0.05

Physical Properties

The following table discusses the physical properties UNS C12900 silver copper.

Properties Metric Imperial
Density 8.8 - 8.94 kg/m3 3.1 - 3.2 x 10-4 lb/in3

Mechanical Properties

The mechanical properties of the UNS C12900 copper are tabulated below.

Properties Metric Imperial
Tensile Strength 221-462 MPa 32-67 ksi
Yield Strength 69-365 MPa 10-53 ksi
Modulus of elasticity 117 GPa 16969 ksi
Poisson’s ratio 0.34 0.34

Other Designations

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Other designations that are equivalent to the UNS C12900 copper include:

  • ASTM B224
  • MIL B-20292
  • UNS C12900

Fabrication and Heat Treatment

Machinability

The machinability the UNS C12900 copper alloy is rated at 20.

Welding

Welding methods including soldering, brazing, gas shielding and butt welding are preferred. Methods like oxyacetylene welding, coated metal arc welding, spot welding and seam welding are not recommended.

Forging

The forging temperature for UNS C12900 copper alloy ranges between 760 and 954ºC (1400 and 1750ºF).

Hot Working

UNS C12900 copper alloys have excellent hot working abilities.

Cold Working

UNS C12900 copper alloys have excellent cold working properties.

Annealing

UNS C12900 copper alloys are annealed at temperatures ranging from 398 and 648ºC (750 and 1200ºF).

Applications

UNS C12900 copper alloys find application in:

  • Electrical/electronic connectors
  • Bus bars

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