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: Boasting an impressive tensile strength of 620-900 MPa and a robust yield strength of 450-750 MPa, which varies by temper, this product is engineered for durability.
High Conductivity: With an electrical conductivity range of 25-34 MS/m, translating to 45-60% IACS, this material stands superior to standard bronze and brass, making it a top choice for high-performance applications.
Stress Relaxation Resistance: It ensures exceptional stress retention, maintaining over 70% residual stress even at a high temperature of 200°C, thereby guaranteeing long-term stability.
Formability: Offers outstanding cold workability with a minimum bending radius of just twice the material thickness, allowing for versatile manufacturing options.
Eco-Certified: Environmentally friendly and completely lead-free, it complies fully with RoHS and ELV standards, aligning with sustainable practices.
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 such as stamping and bending, with a recommended minimum bend radius of double the thickness, ensuring precision and quality.
- Welding: For optimal results, employ TIG or MIG welding methods for excellent performance, with good results achievable via soft soldering.
- Heat Treatment:
- Soft Annealing: Carefully executed at 600-700°C for 1-3 hours to achieve desirable material properties.
- Hot Working: Conducted between 800-950°C to ensure the best structural 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: Certified to meet ASTM B888, RoHS, and ELV standards, with comprehensive Mill Certificates readily available.
- Testing Reports: Detailed reports covering mechanical properties, conductivity, and metallurgical analysis are provided to ensure quality assurance.
- Customization: We offer customization options in non-standard sizes and various surface treatments, including tin or silver plating, to suit diverse needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a division of the esteemed Huahong Group (A-STOCK : 002645.SZ), recognized as a leading Copper Alloy products manufacturer in eastern China, conveniently located near Shanghai.
We specialize in the advanced production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, efficient 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 of copper products, our offerings are integral to applications in seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit sectors.
And we proudly authored the National Standard for copper alloy seamless tubes and pipes tailored for Nuclear Power!
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