CuNi2Si (CW111C / C18000 / 2.0855) is a copper-based alloy containing nickel and silicon. Classified under RWMA Class III, this alloy offers a unique combination of high electrical conductivity and excellent mechanical strength. It is a safe, environmentally friendly, high-performance solution for industries seeking beryllium-free alternatives.
Thanks to its high hardness, oxidation resistance, and dimensional stability under heat, CuNi2Si is widely used in precision applications such as resistance welding systems, molds, connectors, and high-frequency conductive components.
Technical Advantages:
- Medium-to-high electrical conductivity (40–60% IACS)
- High hardness and strength after heat treatment (typically HRc 38–42)
- Excellent wear and deformation resistance
- Strong oxidation and high-temperature resistance
- Non-sparking and anti-magnetic properties
- Beryllium-free and environmentally friendly alloy
Primary Application Areas:
Resistance Welding: Electrode tips, pressure components, contacts
Tooling & Moldmaking: Injection molds, cores, high-speed tool surfaces
Electrical & Electronics: Connectors, springs, high-frequency conductive parts
Defense & Aerospace: Components exposed to thermal stress, radar elements
Automotive: High-precision mechanical parts, electric vehicle components
Quality Assurance & Standards:
CuNi2Si fully complies with the following standards:
EN: CW111C
ASTM / UNS: C18000
DIN: 2.0855
RWMA: Class III (suitable for resistance welding applications)
All production batches are delivered with chemical analysis reports, hardness test results, conductivity measurements, and microstructure inspection certificates, ensuring full traceability. The alloy complies with RoHS and REACH directives.
PHYSICAL PROPERTIES
| Cu | Ni | Si |
|---|---|---|
| % rem | %1.6-2.5 | % 0.4-0.8 |
AVALIABLE STANDART
| EN | ASTM | AMS | DIN | RWMA |
|---|---|---|---|---|
| CW111C | C18000 | 2.0855 | Class III |
APPLICATIONS
- Resistance Welding Electrodes
- Seam Weldings Wheels
- Plunger Tips for Aluminium High Pressure Die-Casting
- Molds for Low Gravity Die-Casting
- Circuit Breaker Switches
- Electrical Components
- Injection Nozzles
- Continuous Casting Molds (ferrous and non-ferrous metal)
- Rotor Bars and Circuit Rings
- Circuit Breaker Switches
- Electrical Components
- Rotor Wedges in Generators
SUPPLIED FORM
- Rings
- Plates
- Discs
- Tubes
- Round bars
- Square bars
- Rectangular bars
- Hexagon bars
- Custom shapes are available upon reques
PHYSICAL PROPERTIES
| Density | Specific Heat | Electrical Conductivity | Electrical Conductivity (I.A.C.S.) | Thermal Conductivity |
|---|---|---|---|---|
| 8.7 g/mm3 | 0.42 J/g.K | min. 24 MS/m | min. 43 % | 200 W/m.K |
MECHANICAL PROPERTIES
| MATERIAL CONDITION | Tensile Strenght Rm N/mm² | Yield Strengh Rp 0,2 N/mm² | Elongation (A5) % | Hardness (Brinell) HB30 |
|---|---|---|---|---|
| EXTRUDED | min. 500 | min. 350 | min. 10 | min. 160 |
| FORGED | min. 450 | min. 350 | min. 10 | min. 160 |
1. Electrical and Electronics Industry
Resistance welding electrodes (RWMA Class III)
Connectors, terminals, and spring-loaded contacts
Short-circuit rings and rotor bars for squirrel-cage motors and generators, also used as slip rings
Micro-switch components
EMI/RFI-shielded electrical parts
2. Automotive Industry
Engine components and sensor housings
Electric drive and signal transmission parts
High-temperature resistant electrical connections
3. Aerospace and Defense Industry
Structural fastening and connection components
Conductive housings used in radar and signal systems
Non-magnetic, high-strength precision components
4. Mold and Tooling Industry
Wear-resistant punches and die components
Core inserts for plastic injection molding
Electrodes and conductive mold elements
5. Energy and Power Systems
Arc-resistant contact surfaces
Transformer connection components
High-current carrying conductive parts
