Special Brass Instruments

CuNi3Si-CuNi2Si

Copper Alloys

EN CW111C - UNS C70250

CuNi3Si/CuNi2Si is a high-strength copper alloy that offers good electrical conductivity and excellent resistance to wear and fatigue. Thanks to the structural hardening achieved through heat treatment, it exhibits very good mechanical properties while maintaining conductivity superior to that of conventional bronzes. It is particularly well-suited for precision applications subject to repeated mechanical stresses.

Properties

Machinability
Conductivity (electrical and thermal)
Deformability (hot and cold)

Development

Hot-extruded
Cold-drawn
Forged

States

R550 / H150
R600 / H165
R640 / H180

Applications

Electrical Connectors and Contacts
Conductive springs
Aviation Components

Chemical Composition

ElementCu (%)Neither (%)Yes (%)Other (%)
ContentsRemaining2.6–4.50.8–1.3≤0.82

Mechanical Properties

Hardness (HB)≥165
Rm (MPa)≥640
0.2 Rp (MPa)≥590
A%≥10
% IACS≥35
Density (g/cm³)8.8

Available Sizes

Round

Flat side

Hexagonal

Custom-made

Standards

EN 12163
ASTM B150
ASTM B124

Certificate 3.1 available

Upon request when ordering

* These values are for reference only; they may vary depending on the standard and condition.