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Copper Cadmium

Copper Chromium

|Alloy Grade - CuCr

Material No. Unified Numbering System (UNS): C18200

Chemical Composition

Element Cu(1,2) Pb Fe Cr Si
Min (%) 0.6
Max (%) Rem 0.05 0.10 1.2 0.10
  • Cu + Sum of Named Elements 99.5% min.
  • Cu value includes Ag.

This is high conductivity heat treatable copper alloy. Heat treatment cycle consist of Solusionizing followed by ageing Process.

Common Fabrication Processes

  • Bending
  • Cold working
  • Drawing
  • Extruding
  • Forging
  • Machining
  • Hot working
  • Ring Rolling
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Mechanical & Electrical Properties

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Form Range In mm Tensile Strength In N/MM2 Elongation In % Rockwell Hardness in B Scale-HRB Conductivity% IACS at 20°C
Rod < 25 >450 >10 ≥72 ≥78
25-50 >370 >12 ≥70 ≥78
>50 >360 >15 ≥65 ≥78
Flat Products - >360 >10 ≥65 ≥78
Seam Welding Wheel minØ 60 max. as per Customer Requirement - - ≥65 ≥78
Tube as extruded Condition - - - ≥65 ≥78
Forged Block - - - ≥65 ≥78

Physical Properties

Melting Point – Liquidus °C 1075
Melting Point – Solidus °C 1070
Density lb/cu in. at 20°C 0.321
Specific Gravity 8.89
Electrical Conductivity% IACS at 20°C 80(1)
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 20°C 187(2)
Coefficient of Thermal Expansion 20-100 10⁻⁶ per °C (20 – 100°C) 9.8
Specific Heat Capacity Btu/ lb /°F at 20°C 0.092
Modulus of Elasticity in Tension ksi 17000
Modulus of Rigidity ksi 7200

Solution heat treated, cold worked (50% minimum) and aged.

Typical Applications

Product Category Product
Electrical
  • Electrical Connectors in Transformer Applications
  • Electrical Contacts in MV/HV Switch Gear Application
  • Semi-Conductor Industry
Industrial
  • Resistance Welding Machine Electrodes
  • Seam Welding Wheels in Automobile Industry

Applicable Form & Size

Form Size
Rod

Dia: Ø6 mm-Ø50mm

Length : 2 Mtr. max

Dia: Ø51 mm-Ø100mm

Length: 1 Mtr max

Dia: Ø101 mm-Ø145mm

Length: 0.5 Mtr max
Flat

Thick: 5 mm - 60 mm

Width: 20 mm - 150 mm

Length: 2 Mtr max
Profile

Circumscribing circle of Dia 30 to 150 mm
Wheel

Dia: Ø400 mm max

Thick: 6 mm – 50 mm
Tube As extruded and Machined

ID: Ø45 mm- Ø117mm

OD: Ø85 mm- Ø150mm
Forged Block

Thick: 170 mm max

Width: 320 mm max

Length: 600 mm max

Apart from above we can also manufacture as per customer specification.