CuNi2Si CuNi2SiCr, 2.0855, C18000, CW111C, CuNiSi, CuNi2Si, C70250, CuNi2Si +Cr Class 3 (III)
Chemical Composition
CuNi2Si - CW111C
Cu: Rest
Ni: 1.60-2.50
Si: 0.40 - 0.80
Cr: 0.10 - 0.30
Others: 0.15 Max
Mechanical Composition
CuNi2Si - CW111C
Hardness: 190-210 HB
Yield Strenght: 500
Tensile Strenght: 680
Elongation: 13
Applications of CuNi2Si
CuNi2Si - CW111C
Plunger tips for HPDC and LPDC
Piston head for aluminium die casting
Welding applications
Mould insert
Wire mesh electrodes
Automotive chassis welding
Electrical applications
Avaliable Forms of CuNi2Si
CuNi2Si - CW111C
Flat bars
Round bars
Ring bars
Discs
Machined parts
CuNi2Si CuNi2SiCr, 2.0855, C18000, CW111C, CuNiSi, CuNi2Si, C70250, CuNi2Si +Cr Class 3 (III)
CuNi2Si is a copper-nickel-silicon alloy known for its excellent combination of mechanical strength, electrical conductivity, and wear resistance. This alloy is often used in applications where these properties are critical, such as electrical connectors, springs, and thermal management components.
Specifications:
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High Mechanical Strength:
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Tensile strength: 500–750 MPa (depending on heat treatment).
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Yield strength: 350–600 MPa.
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Good Electrical Conductivity:
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~25–50% IACS (International Annealed Copper Standard), depending on processing and heat treatment.
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Excellent Wear and Corrosion Resistance:
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Particularly in demanding environments, including marine and industrial settings.
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Thermal Stability:
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Retains mechanical properties at elevated temperatures.
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Fatigue and Creep Resistance:
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Makes it suitable for dynamic and thermal stress applications.
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Applications:
CuNi2Si is used in industries where a balance of strength and conductivity is required:
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Electrical Components:
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Terminals, connectors, and switches.
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Automotive:
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Relay springs and connectors.
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Aerospace:
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High-performance electrical components.
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Industrial Equipment:
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Resistance welding components, bushings, and wear plates.
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Telecommunications:
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Spring contacts and signal conductors.
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Heat Treatment:
CuNi2Si achieves its optimal properties through controlled heat treatment:
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Solution Annealing:
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Dissolves nickel and silicon into the copper matrix at high temperatures.
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Quenching:
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Rapid cooling locks alloying elements in solution.
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Aging:
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Precipitates nickel silicide phases, increasing strength and hardness while maintaining good conductivity.
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Standards and Norms:
CuNi2Si is standardized under various international norms:
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EN Standards:
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EN 12163: Copper and copper alloys – Rods for general purposes.
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EN 12167: Copper and copper alloys – Profiles and rectangular bars.
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Designated as CW111C in the European system.
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DIN (Germany):
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Designated as 2.0855.
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ASTM:
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Similar materials may be specified under ASTM classifications.
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