Copper UNS C12000

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 copper has high electrical and thermal conductivity. Alloys can be freely formed by copper. UNS C12000 copper has 95% IACS conductivity, low residual phosphorus, and high embrittlement resistance. It is available in the form of rod, tube, and wire.

Chemical Composition

The chemical composition of UNS C12000 copper is outlined in the following table.

Element Content (%)
Cu 99.9
P 0.008

Physical Properties

The physical properties of UNS C12000 copper are tabulated below.

Properties Metric Imperial
Density 8.89 g/cm3 0.321 lb/in3
Melting point 1083°C 1981°F

Mechanical Properties

The following table shows mechanical properties of UNS C12000 copper.

Properties Metric Imperial
Tensile strength, ultimate 221 - 393 MPa 32100 - 57000 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%
Machinability (UNS C36000 (free-cutting brass) = 100%) 20% 20%
Poisson's ratio 0.34 0.34
Elastic modulus 117 GPa 16970 ksi

Other Designations

Other designations that are equivalent to UNS C12000 copper are listed in the following table.

ASME SB111 ASTM B152 ASTM B359 ASTM B506 ASTM B716
ASME SB133 ASTM B187 ASTM B372 ASTM B623 ASTM B743
ASME SB359 ASTM B188 ASTM B395 ASTM B638 ASTM B75
ASME SB395 ASTM B224 ASTM B42 ASTM B640 ASTM B88
ASME SB42 ASTM B272 ASTM B442 ASTM B641 MIL B-18907
ASME SB75 ASTM B280 ASTM B447 ASTM B68 MIL B-20292
ASTM B111 ASTM B302 ASTM B451 ASTM B687 MIL T-24107
ASTM B133 ASTM B306 ASTM B5 ASTM B698 MIL T-3235
SAE J463 MIL W-85 SAE J461

Fabrication and Heat Treatment

Machinability

The machinability rate of UNS C12000 copper is 20%

Welding

Brazing, gas shielded arc welding, oxyacetylene welding, soldering, and butt welding are the methods used for welding UNS C12000 copper. It is suggested that seam welding, coated metal arc welding, and spot welding are not used for welding this alloy.

Forging

Forging of UNS C12000 copper can be performed at a temperature of about 760 to 871°C (1400 to 1600°F). This alloy has good forgeability.

Hot Working

UNS C12000 copper has excellent hot working capacity.

Cold Working

UNS C12000 copper has good excellent cold working capacity.

Annealing

Annealing of UNS C12000 copper can be performed at 372 to 649°C (700 to 1200°F).

Applications

UNS C12000 copper finds applications in bus bars and electromechanical hardware connectors.

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