Oxygen Free Silver-Bearing Copper – UNS C10700

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

Pure and unalloyed coppers have good corrosion resistance and high thermal and electrical conductivity. Pure copper is designated as UNS C10100 to C13000. Oxygen free coppers are applicable in all applications, which require high ductility and conductivity. Impurities present in different grades of unalloyed copper vary from each other.

Chemical Composition

The chemical composition of the UNS C10700 copper is outlined in the following table.

Element Content (%)
Cu 99.95
Ag 0.07813

Physical Properties

The physical properties of the UNS C10700 copper are given below.

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

Mechanical Properties

The following table shows mechanical properties of the UNS C10700 copper.

Properties Metric Imperial
Tensile strength, ultimate 221 - 455 MPa 32100 - 66000 psi
Tensile strength, yield (depending on temper) 69.0 - 365 MPa 10000 - 52900 psi
Elongation at break (in 101.6 mm (4 in.) 55% 55%
Modulus of elasticity 115 GPa 16700 ksi
Poisson’s ratio 0.300 0.300
Machinability (UNS C36000 (free-cutting brass) = 100%) 20% 20%
Shear modulus 44.0 GPa 6380 ksi

Other Designations

Other designations that are equivalent to the UNS C10700 copper are listed in the following table.

ASME SB152 ASTM B188 ASTM B272 QQ B650
ASTM B1 ASTM B189 ASTM B298 ASTM B506
ASTM B133 ASTM B2 ASTM B3 MIL B-19231
ASTM B152 ASTM B224 ASTM B355 MIL B-20292
ASTM B187 ASTM B246 ASTM B49 MIL W-3318

Fabrication and Heat Treatment

Machinability

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The machinability rate of the UNS C10700 copper is 20%.

Welding

Brazing, soldering, gas shielded arc welding, oxyacetylene welding, and butt welding are the methods recommended for welding the UNS C10700 copper. It is recommended that spot welding, coated metal arc welding, and seam welding methods are not used for welding the UNS C10700 copper.

Forging

The UNS C10700 copper can be forged at 760 to 871°C (1400 to 1600°F). Hot forgeability of this alloy is rated as 65%.

Hot Working

The UNS C10700 copper has excellent hot working capacity.

Cold Working

The UNS C10700 copper has excellent cold working capacity.

Annealing

The UNS C10700 copper can be annealed at 482 to 760°C (900 to 1400°F).

Applications

The UNS C10700 copper is most commonly used in electrical conductors, which are operated at high temperatures.

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