Oxygen Free Extra Low Phosphorus Copper – UNS C10300

Topics Covered

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

Introduction

Unalloyed coppers have high electrical and thermal conductivity as well as high resistance to corrosion. The UNS numbers C10100 to C13000 are used to denote commercially pure copper. The behavior of different grades of unalloyed copper varies with the amount of impurities present in it. Oxygen-free coppers are used for applications that require high conductivity and exceptional ductility.

The following data sheet discusses in detail about oxygen free extra low phosphorus copper UNS C10300.

Chemical Composition

The following table shows the chemical composition of UNS C10300 oxygen free copper.

Element Content (%)
Cu 99.95
P 0.005

Physical Properties

The physical properties of UNS C10300 oxygen free copper are given in the following table.

Properties Metric Imperial
Density 8.8 - 8.94 g/cm³ 0.317 - 0.323 lb/in3
Melting point 1083°C 1981°F

Other Designations

Other designations that are equivalent to UNS C10300 oxygen free copper include the following.

ASTM B111 ASTM B306 ASTM B638 ASTM B75
ASTM B133 ASTM B359 ASTM B640 ASTM B88
ASTM B152 ASTM B372 ASTM B641 MIL B-20292
ASTM B187 ASTM B379 ASTM B68 MIL T-3235
ASTM B188 ASTM B395 ASTM B687 UNS C10300
ASTM B224 ASTM B42 ASTM B698
ASTM B280 ASTM B432 ASTM B716
ASTM B302 ASTM B447 ASTM B743

Fabrication and Heat Treatment

Machinability

UNS C10300 copper has a machinability rate of 20%.

Welding

Following are the recommended welding methods for UNS C10300 copper:

  • Soldering – excellent
  • Brazing – excellent
  • Oxyacetylene welding – fair
  • Gas shielded arc welding – excellent
  • Coated metal arc welding – recommended
  • Spot welding - not recommended
  • Seam welding - not recommended
  • Butt welding - good

Forging

UNS C10300 copper is forged at hot working temperature between 760 to 871°C (1400 to 1600°F). The hot forgeability rate of this metal is 65%.

Hot Working

UNS C10300 copper has excellent hot working property.

Cold Working

UNS C10300 copper has good cold working property.

Annealing

Annealing of UNS C10300 copper is performed at temperature between 371 and 649°C (700 and 1200°F).

Applications

The following are the major applications of UNS C10300 oxygen free copper:

  • Electrical and electronic conductors
  • Wave guides
  • Cavity resonators
  • Superconductor matrixes
  • Vacuum tube and solid-state devices
  • Glass-to-metal seals

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