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: With an impressive tensile strength range of 620-900 MPa and a yield strength of 450-750 MPa, adaptable across different tempers, this alloy stands out for its resilience.
High Conductivity: Experience superior electrical conductivity at 25-34 MS/m (45-60% IACS), offering significant advantages over standard bronze and brass.
Stress Relaxation Resistance: Remarkably retains over 70% of its residual stress even at elevated temperatures of 200°C.
Formability: Achieve exceptional cold workability with a minimum bending radius of just 2× the thickness, facilitating versatile applications.
Eco-Certified: Proudly lead-free and fully compliant with RoHS & ELV standards, ensuring environmental responsibility.
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: Ideal for precise stamping and bending processes with a minimum bend radius of 2× thickness.
- Welding: Advanced welding methods such as TIG and MIG are highly recommended for excellent results; soft soldering is also effective.
- Heat Treatment:
- Soft Annealing: Performed at 600-700°C for 1-3 hours for optimal metal softness.
- Hot Working: Best results achieved between 800-950°C.
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: Certified under ASTM B888, RoHS, and ELV; Mill Certificates are readily available for your assurance.
- Testing Reports: Detailed reports available, covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Offering non-standard sizes and specialized surface treatments like tin and silver plating to meet unique requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a branch of the renowned Huahong Group (A-STOCK: 002645.SZ), a distinguished manufacturer of copper alloy products located in eastern China, close to the bustling hub of Shanghai.
We specialize in fabricating a variety of copper and copper alloy products includingadmiralty brass, naval brass, aluminum brass, cupronickel, and copper nickelcondenser tubes, highly efficient heat exchange tubes, large diameter copper nickel pipes, forged copper alloy flanges, oxygen-free copper products, and railway ground cables. With an annual production capacity exceeding 30,000 tons, our products are integral to industries like seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, among others.
Additionally, we contributed to developing the National Standard for copper alloy seamless tubes and pipes used in Nuclear Powerprojects, marking a significant achievement!
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