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 impressive tensile strength ranging from 620-900 MPa, and a yield strength of 450-750 MPa depending on the temper, ensuring robust and reliable performance across various applications.
High Conductivity: With electrical conductivity between 25-34 MS/m (45-60% IACS), this alloy surpasses the standard bronze and brass, making it a superior choice for electrical and thermal applications.
Stress Relaxation Resistance: Remarkably maintains over 70% of residual stress even at high temperatures of 200°C, providing long-lasting and dependable service.
Formability: Outstanding cold workability with a minimum bending radius of just 2× the material thickness, allowing for versatile and intricate designs.
Eco-Certified: Environmentally friendly as it is lead-free and adheres to RoHS & ELV standards, ensuring safety and sustainability.
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: Perfectly suited for stamping and bending processes, maintaining a minimal bend radius of 2× thickness, ideal for precision applications.
- Welding: Recommended welding methods include TIG/MIG for excellent results, and soft soldering for good outcomes, ensuring flexibility in manufacturing.
- Heat Treatment:
- Soft Annealing: Requires a temperature range of 600-700°C for 1-3 hours, enabling the material to attain desired softness and ductility.
- Hot Working: Optimal within the 800-950°C range, facilitating effective shaping and forming of the alloy.
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: Backed by ASTM B888, RoHS, and ELV certifications; Mill Certificates available upon request to verify quality and compliance.
- Testing Reports: Comprehensive reports available on mechanical properties, conductivity, and metallurgical analysis, ensuring transparency and reliability.
- Customization: Offers the flexibility of non-standard sizes and specialized surface treatments such as tin and silver plating to meet specific needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a branch of the Huahong Group (A-STOCK: 002645.SZ), renowned for its copper alloy products. Situated strategically in eastern China, near the bustling metropolis of Shanghai.
We specialize in the manufacture of copper and copper alloy products, includingadmiralty brass, naval brass, aluminum brass, and 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. Our production capacity exceeds 30,000 tons annually. Our products are extensively used in industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Furthermore, we have contributed to writing the National Standard for copper alloy seamless tubes and pipes applicable to Nuclear Powerapplications!
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