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: With a remarkable tensile strength ranging from 620 to 900 MPa and a yield strength of 450 to 750 MPa, dependent on temper, this product is engineered for durability and resilience.
High Conductivity: Boasting an electrical conductivity between 25-34 MS/m (or 45-60% IACS), it surpasses traditional bronze and brass, ensuring superior performance in various applications.
Stress Relaxation Resistance: Remarkably maintains over 70% residual stress at elevated temperatures of 200°C, ensuring long-term reliability and stability.
Formability: Designed for excellent cold workability with a minimal bending radius of just 2× thickness, allowing for versatile manufacturing options.
Eco-Certified: Proudly lead-free and fully compliant with RoHS & ELV standards, this product is as environmentally friendly as it is effective.
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 with a minimum bend radius of 2× thickness, enhancing manufacturing efficiency.
- Welding: Optimal methods include TIG/MIG welding for excellent results, with good outcomes also achievable through soft soldering techniques.
- Heat Treatment:
- Soft Annealing: Maintain a temperature range of 600-700°C for 1-3 hours, ensuring material softness and workability.
- Hot Working: Achieve peak performance at temperatures between 800-950°C.
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, with Mill Certificates readily available for your assurance.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis to ensure optimal quality and performance.
- Customization: Tailor your needs with non-standard sizes and specialized surface treatments such as tin or silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a distinguished branch of Huahong Group (A-STOCK : 002645.SZ), a prestigious Copper Alloy products manufacturer strategically situated in eastern China, close to the vibrant city of Shanghai.
We are at the forefront of producing premium copper and copper alloy products (featuring materials such as admiralty brass, naval brass, aluminum brass, cupronickel, and copper nickel.) This includes condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our extensive production capacity exceeds 30,000 tons annually. Our products are integral to industries like seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we proudly authored the National Standard for copper alloy seamless tubes and pipes for Nuclear Power! Our expertise is recognized and trusted industry-wide.
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