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: Exhibit exceptional tensile strength ranging from 620-900 MPa, with a yield strength window of 450-750 MPa, contingent on the temper applied, offering reliability in high-demand applications.
High Conductivity: Boasting electrical conductivity levels of 25-34 MS/m, equating to 45-60% IACS, this alloy surpasses standard bronze and brass, ensuring superior performance in electrical applications.
Stress Relaxation Resistance: Capably retains over 70% of its residual stress even at elevated temperatures up to 200°C, providing outstanding stability under continuous stress conditions.
Formability: Demonstrates excellent cold workability with a minimum bending radius of 2× thickness, facilitating easy manipulation and forming for various industrial needs.
Eco-Certified: This environmentally friendly alloy is lead-free and fully compliant with RoHS and ELV standards, aligning with sustainable practices and regulations.
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: Suited for stamping and bending operations with a minimum bending radius of 2× thickness, this material is highly versatile for diverse manufacturing processes.
- Welding: Preferred welding techniques include TIG and MIG for excellent results, while soft soldering is also a viable option, offering good joint integrity.
- Heat Treatment:
- Soft Annealing: Processed at 600-700°C for 1-3 hours, ensuring optimal softness and ductility.
- Hot Working: Carried out at temperatures ranging from 800 to 950°C, this method enhances the material's mechanical properties.
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 to ASTM B888, RoHS, and ELV standards, with comprehensive Mill Certificates available to ensure quality assurance.
- Testing Reports: Detailed reports are available covering mechanical properties, electrical conductivity, and metallurgical analysis, guaranteeing product reliability and performance.
- Customization: Offering customization with non-standard sizes and specialized surface treatments like tin or silver plating to meet specific project requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a prominent branch of Huahong Group (A-STOCK : 002645.SZ), a renowned manufacturer of copper alloy products situated in eastern China, conveniently close to Shanghai.
We specialize in producing a wide range of copper and copper alloy products includingadmiralty brass, naval brass, aluminum brass, and cupronickel/copper nickelcondenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. We boast an impressive annual production capacity exceeding 30,000 tons of copper products, extensively utilized in industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Moreover, we have contributed to writing the National Standard for copper alloy seamless tubes and pipes specifically designed for Nuclear Power,
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