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COLSIBRO® Copper Alloy

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2.0855 (CuNi2Si) is a precipitation hardening copper nickel silicon that offers a remarkable blend of physical and mechanical attributes unrivalled by many other grades of copper alloy. Colsibro® is a high copper alloy with small additions of nickel and silicon, which combine to increase the strength, hardness and wear resistance of the material, while retaining many of the physical benefits of copper itself. It shows the following features and properties:

  • Excellent corrosion resistance, surpassing many copper alloys, with complete freedom from stress corrosion
  • High strength and hardness
  • Very good wear resistance and bearing properties
  • Excellent thermal and electrical conductivities compared to most non-ferrous alloys
  • Outstanding cryogenic properties and an exceptionally low magnetic permeability
  • Complete freedom from hydrogen embrittlement
  • Spark resistance
  • Related Standards

    Equivalent Materials

    This material data has been provided by Matmatch.

    "Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

    Ashby charts





    23.0 °C

    8.87 g/cm³

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    23.0 °C

    10 %

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    Hardness, Brinell

    23.0 °C

    155 - 180 [-]

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    Tensile strength

    23.0 °C

    550 - 640 MPa

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    Yield strength Rp0.2

    23.0 °C

    430 - 590 MPa

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    Coefficient of thermal expansion

    23.0 °C

    1.6E-5 1/K

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    for 0-400°C

    Melting point

    1040 - 1060 °C

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    Thermal conductivity

    23.0 °C

    160 W/(m·K)

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    Electrical conductivity

    23.0 °C

    2.03E+7 S/m

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    Specific Electrical conductivity

    35 % IACS

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    Relative magnetic permeability

    23.0 °C

    1 [-]

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    Chemical properties





    1.6 - 2.2 %

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    0.4 - 0.8 %

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    Technological properties

    Application areas

    Automotive: Valve guides, valve seats, gears, rocker and little end bushes or internal combustion engines requiring extreme performance;Offshore & marine: Fasteners, valves, choke stems, down-hole tooling, cryogenic storage tanks and pump bodies;Electrical: current-carrying electrical components such as slip rings, squirrel cages, springs, rotary switch contacts, contact blades, short-circuit rings and heavy duty switchgear;Other: Non-magnetic instrument components and spark-resistant safety tooling

    Cold Forming

    It can be cold formed

    Corrosion properties

    Excellent corrosion resistance

    General machinability

    Easily machined

    Hot forming

    It can be hot formed