Product Details for CuNi3Si1Mg (C70250)
1. Core Specifications
| Item |
Details |
| Grade |
CuNi3Si1Mg (UNS C70250) |
| Standard |
ASTM B888, RoHS & ELV Compliant |
| Composition |
Cu (Balance), Ni 3%, Si 0.65%, Mg 0.15%, Pb <0.05% |
| Material Type |
Precipitation-Hardened High Copper Alloy |
2. Key Advantages
High Strength: Experience unmatched durability with tensile strength ranging from 620 to 900 MPa and yield strength between 450 to 750 MPa, varying by temper.
High Conductivity: Enjoy superior electrical performance with conductivity of 25-34 MS/m, which translates to a remarkable 45-60% IACS, outperforming standard bronze and brass.
Stress Relaxation Resistance: Achieve exceptional performance with over 70% residual stress retention at elevated temperatures up to 200°C.
Formability: Benefit from outstanding cold workability, supporting a minimum bending radius as small as 2× the material's thickness.
Eco-Certified: Our lead-free products are fully compliant with RoHS and ELV directives, ensuring eco-friendly and sustainable solutions.
3. Typical Applications
| Industry |
Applications |
| Electronics |
High-density connectors, CPU sockets, relay springs, micro-switch contacts |
| Automotive |
Fuel injection components, sensor terminals, battery connectors |
| Industrial Equipment |
High-temperature springs, solenoid coils, precision instrument contacts |
| Renewable Energy |
PV junction boxes, EV charging port components |
4. Physical & Mechanical Properties
| Parameter |
Typical Value |
Test Standard |
| Density |
8.82 g/cm³ |
ISO 1183 |
| Thermal Conductivity |
190 W/(m·K) |
ASTM E1461 |
| Thermal Expansion (0-300°C) |
17.6×10-6/K |
ASTM E228 |
| Elastic Modulus |
131 GPa |
ASTM E111 |
| Hardness (HV) |
180-270 (depends on temper) |
ASTM E384 |
5. Processing & Heat Treatment
- Cold Working: Perfect for stamping and bending applications, with a minimum bend radius of just 2× thickness, ensuring flexibility and precision.
- Welding: Recommended welding methods include TIG and MIG for excellent results, while soft soldering also yields good outcomes.
- Heat Treatment:
- Soft Annealing: Treat the material at temperatures between 600-700°C for 1 to 3 hours to achieve desired malleability.
- Hot Working: Perform hot working processes at temperatures ranging from 800-950°C for optimal shaping and forming.
6. Available Forms & Dimensions
| Form |
Size Range |
Custom Options |
| Strip |
Thickness: 0.1mm-5.0mm, Width: ≥3mm |
Hot-dip tinned, contour-milled, coatings |
| Sheet |
Thickness: 0.5mm-10mm |
Mechanical/electrolytic polishing |
| Wire |
Diameter: 0.5mm-20mm |
Precision cold-drawn/polished |
| Tube |
OD: 3mm-50mm, Wall: 0.2mm-5mm |
Seamless/welded customization |
7. Certifications & Support
- Certifications: Our products meet ASTM B888 standards and are RoHS and ELV certified, with Mill Certificates available for full traceability.
- Testing Reports: Comprehensive testing reports cover mechanical properties, conductivity, and metallurgical analysis, ensuring quality and consistency.
- Customization: We offer customization for non-standard sizes and specialized surface treatments, including tin and silver plating, to meet specific requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a proud division of the prestigious Huahong Group (A-STOCK : 002645.SZ), renowned as a leading manufacturer of Copper Alloy products in eastern China, strategically located near Shanghai.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tube, efficient heat exchange tube, large diameter copper nickel pipe, copper alloy forged flanges, oxygen-free copper products and railway ground cable. With an impressive annual production capacity exceeding 30,000 tons of copper products, our offerings are integral to a wide array of industries, including seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Moreover, we have proudly authored the National Standard for copper alloy seamless tube/pipe, specifically tailored for Nuclear Power, setting benchmarks for the industry.
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