COLSIBRO®: Premium Copper Nickel Silicon Alloy for Superior Strength & Corrosion Resistance

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

Additional services: Cuttings, Parts from drawings

LEBRONZE ALLOYS

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Information and services

Quantity: Depending on material – Contact usAdditional services: Specific treatments, size customisation, co-design

Properties

General

Property	Temperature	Value
Density	23.0 °C	8.87 g/cm³

Mechanical

Property	Temperature	Value
Elongation	23.0 °C	10 %
Hardness, Brinell	23.0 °C	155 - 180 [-]
Tensile strength	23.0 °C	550 - 640 MPa
Yield strength Rp0.2	23.0 °C	430 - 590 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.6E-5 1/K	for 0-400°C
Melting point		1040 - 1060 °C
Thermal conductivity	23.0 °C	160 W/(m·K)

Electrical

Property	Temperature	Value
Electrical conductivity	23.0 °C	2.03E+7 S/m
Specific Electrical conductivity		35 % IACS

Magnetic

Property	Temperature	Value
Relative magnetic permeability	23.0 °C	1 [-]

Chemical properties

Property	Value
Copper	Balance
Nickel	1.6 - 2.2 %
Silicon	0.4 - 0.8 %

Technological properties

Property
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

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Metal