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: Exhibiting a remarkable tensile strength ranging from 620-900 MPa and a yield strength between 450-750 MPa, which can vary depending on the temper. This robustness makes it suitable for demanding applications.
High Conductivity: Boasting an impressive electrical conductivity of 25-34 MS/m (45-60% IACS), this alloy outshines standard bronze and brass, making it an excellent choice for efficient electrical applications.
Stress Relaxation Resistance: Retaining over 70% residual stress even at temperatures as high as 200°C, ensuring reliability under thermal stress conditions.
Formability: With excellent cold workability, it allows for a minimum bending radius of 2× the material thickness, facilitating intricate designs.
Eco-Certified: This lead-free alloy complies with RoHS and ELV standards, promoting environmental sustainability without compromising performance.
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: The alloy is well-suited for processes like stamping and bending, with a minimum bend radius requirement of 2× its thickness, offering flexibility in manufacturing.
- Welding: Recommended welding methods for this alloy include TIG and MIG, which offer excellent results, while soft soldering is also effective.
- Heat Treatment:
- Soft Annealing: Conducted between 600-700°C for 1-3 hours to achieve desired ductility and softness.
- Hot Working: Optimal temperature range is 800-950°C to facilitate 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 are certified to ASTM B888, RoHS, and ELV standards, and we provide comprehensive Mill Certificates upon request.
- Testing Reports: Detailed reports on mechanical properties, electrical conductivity, and metallurgical analysis are available to ensure compliance and quality.
- Customization: We offer tailor-made solutions with non-standard sizes and specialized surface treatments, such as tin or silver plating, to meet unique customer requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) operates as a distinguished branch of the Huahong Group (A-STOCK: 002645.SZ). Renowned for our expertise in copper alloy products, we are strategically located in eastern China, in proximity to Shanghai, ensuring accessibility and convenience.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes and efficient heat exchange tubes. Our extensive product line also features large-diameter copper nickel pipes, forged flanges, and oxygen-free copper products. With an impressive annual production capacity exceeding 30,000 tons, our offerings cater to a myriad of industries including seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we wrote the National Standard of copper alloy seamless tube/pipe for Nuclear Power!
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