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 exceptional tensile strength ranging from 620-900 MPa and a yield strength between 450-750 MPa, adaptable to specific tempers for diverse applications.
High Conductivity: Featuring electrical conductivity of 25-34 MS/m, this alloy offers 45-60% IACS, surpassing the performance of traditional bronze and brass.
Stress Relaxation Resistance: Guarantees remarkable performance with over 70% residual stress retention at temperatures up to 200°C.
Formability: Benefit from its outstanding cold workability with a minimum bending radius of just 2× thickness, perfect for intricate designs.
Eco-Certified: Proudly lead-free and aligning with RoHS & ELV standards, ensuring safe and environmentally friendly usage.
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 processes like stamping and bending with a minimal bend radius requirement of 2× thickness, enhancing versatility.
- Welding: For optimal results, use TIG/MIG welding methods, renowned for excellence, or opt for good soft soldering techniques.
- Heat Treatment:
- Soft Annealing: Conduct at temperatures between 600-700°C for 1-3 hours to achieve desired material properties.
- Hot Working: Best performed within a temperature range of 800-950°C to ensure superior material integrity.
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: Compliant with ASTM B888, RoHS, and ELV standards. Mill Certificates readily available for authenticity and verification.
- Testing Reports: Detailed reports including mechanical properties, conductivity assessments, and meticulous metallurgical analysis.
- Customization: Options for non-standard sizes and enhanced surface treatments such as tin and silver plating for bespoke requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a vital branch of the esteemed Huahong Group (A-STOCK: 002645.SZ), a leading manufacturer of copper alloy products in eastern China, strategically situated near Shanghai.
Specializing in the production of copper and copper alloy products, includingadmiralty brass, naval brass, aluminum brass, cupronickel, and copper nickelcondenser tubes, efficient heat exchange tubes, and large diameter copper nickel pipes. They also produce copper alloy forged flanges, oxygen-free copper products, and railway ground cables. With an established annual production capacity exceeding 30,000 tons, these products find extensive applications in seawater desalination, nuclear power, petrochemical industries, marine environments, steam turbines, pressure vessels, heat exchangers, central air-conditioning systems, household appliances, and railway transit sectors.
Moreover, we proudly contributed to the drafting of the National Standard for copper alloy seamless tubes and pipes used in Nuclear Powerprojects, ensuring world-class quality and innovation.
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