CuNi2Si
CW111CNickel-silicon precipitation-hardened copper — high conductivity (35-45% IACS) + high strength (UTS 600-750 MPa aged). THE lead-free alternative to CuBe2 for connectors where Be toxicity is a concern. Used for high-reliability connectors, relay springs, IC sockets, and automotive electrical contacts. Trade names: C70250 (Wieland), Corson alloy.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C70250 | C70250 | REF |
| 🇪🇺 | EN | Europe | CuNi2Si / CW111C | CW111C | 100% |
Sources: ASTM B422, EN 12163
Mechanical properties — Pro
Aged
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| Elastic Modulus | ||
| Density |
Sign up free and get 5 full lookups immediately.
Sign up free — 5 lookups/day freeRelated materials
CuZn37
2.0321Lead-free alpha/alpha+beta brass (63% Cu, 37% Zn). Compromise between cold formability (CuZn35) and hot formability (CuZn40). The most widely used unleaded brass. Used for cartridge cases, radiator cores, lamp components, plumbing fixtures, and decorative hardware.
CuZn36Pb3
CW603NFree-cutting leaded brass — the benchmark for non-ferrous machinability (rated 100%). Lead particles act as chip breakers for excellent surface finish. Used for screw machine parts, fittings, valves, watch components, precision mechanics, and electrical connectors. Old DIN number 2.0375.
CuSn6
CW452KPhosphor bronze with 6% tin — better cold formability than CuSn8 at slightly lower strength. Excellent spring properties and fatigue resistance. Used for electrical connectors, spring contacts, switch parts, bellows, bourdon tubes, and precision springs.
Not sure which material fits?
🤖 Ask AI Advisor →All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.