Metals & alloys · Copper alloys
C70250 copper–nickel–silicon alloy
A high-strength Cu–Ni–Si connector alloy combining good electrical conductivity, spring performance and resistance to stress relaxation at elevated temperature.
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01
Overview
- Material class
- Metals & alloys
- Category
- Copper alloys
- Family
- High-Performance Connector Copper
- Product forms
- Sheet/plate, Bar/rod
Composition
| Constituent | Min | Max | Typical | Note |
|---|---|---|---|---|
| Ni | 2.2 | 4.2 | 3.2 | |
| Si | 0.25 | 1.2 | 0.7 | |
| Mg | 0.3 | 0.15 | ||
| Cu | Balance |
02
Properties and conditions
Engineering properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Density | 8.8 | g/cm³ | Representative; verify product form and condition |
| Electrical conductivity | ~35–50 | % IACS | Representative; verify product form and condition |
| Yield strength | ~600–850 | MPa | temper dependent |
| Tensile strength | ~650–900 | MPa | Representative; verify product form and condition |
| Elongation | 4–12 | % | Representative; verify product form and condition |
| Stress relaxation resistance | high | connector tempers |
Conditions
Representative supplied condition
Condition not fully specified in the source record.
03
Processing and use
Processing
- Product form, thermal history and manufacturing route materially affect performance.
Applications
- High-current connectors
- Automotive terminals
- Telecommunications springs
- Power electronics
Selection considerations
- Use the current governing standard and supplier certification for design or procurement.
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04
Standards and related materials
Standards and designations
| System | Designation | Note |
|---|---|---|
| UNS | C70250 | |
| ASTM | B422 / B888 | product dependent |
05
Sources and context
Sources
- U.S. Department of Energy lightweight materials programApplication reference
Confirm the applicable specification, product form and condition before using values for design or procurement.
Supply and sustainability
Availability and lead time depend on grade, product form, certification and regional supply chain.
Segregated recovery and closed-loop recycling improve material efficiency where practical.