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: The robust CuNi3Si1Mg (C70250) showcases tensile strength ranging from 620 to 900 MPa and yield strength between 450 to 750 MPa, varying with its temper, ensuring unmatched durability.
High Conductivity: With electrical conductivity spanning 25-34 MS/m (45-60% IACS), this alloy surpasses standard bronze and brass, offering superior performance in demanding applications.
Stress Relaxation Resistance: Retains over 70% of its stress at elevated temperatures up to 200°C, providing dependable performance under prolonged stress conditions.
Formability: Allows excellent cold workability with a minimal bending radius equivalent to 2× thickness, facilitating versatile fabrication options.
Eco-Certified: This lead-free alloy complies with stringent RoHS & ELV standards, embodying a commitment to 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 precision stamping and bending, maintaining a minimum bend radius of 2× thickness for optimal formability.
- Welding: Utilizes superior TIG/MIG methods for excellent performance, complemented by good soft soldering capabilities.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours to achieve optimal material properties.
- Hot Working: Performed at temperatures between 800-950°C, enhancing the material's adaptability.
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: Fully certified under ASTM B888, RoHS, and ELV standards, with Mill Certificates provided for assurance and quality tracking.
- Testing Reports: Comprehensive reports covering mechanical properties, electrical conductivity, and detailed metallurgical analysis.
- Customization: Offers bespoke solutions including non-standard sizing and advanced surface treatments such as tin/silver plating for specific requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) operates under the esteemed Huahong Group (A-STOCK: 002645.SZ), a renowned name in copper alloy manufacturing, strategically located in eastern China near Shanghai.
We specialize in the production of copper and copper alloy products, includingadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickelcondenser tubes, high-efficiency heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. With an impressive annual production capacity exceeding 30,000 tons, our products serve diverse sectors such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, among others.
Additionally, we authored the National Standard for copper alloy seamless tube/pipe applications in Nuclear Power!
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