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: Revel in the robust strength of our C70250, with tensile strength reaching an impressive 620-900 MPa, and yield strength varying between 450-750 MPa depending on temper, ensuring reliability in demanding applications.
High Conductivity: Enjoy superior electrical performance with a conductivity of 25-34 MS/m (45-60% IACS), surpassing traditional bronze and brass, making it ideal for high-efficiency systems.
Stress Relaxation Resistance: Offering remarkable stress relaxation resistance, our alloy maintains over 70% residual stress even at elevated temperatures of 200°C, providing longevity and durability.
Formability: Benefit from outstanding formability with excellent cold workability, allowing a minimum bending radius of just 2× thickness, perfect for intricate designs and applications.
Eco-Certified: Fully eco-compliant, our alloy is lead-free and adheres to RoHS & ELV standards, reflecting our commitment to sustainability and safety.
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: Ideally suited for stamping and bending processes, with a minimum bend radius of 2× thickness, ensuring flexibility in manufacturing.
- Welding: For superior joining, recommended methods include TIG/MIG welding (rated excellent) and soft soldering (rated good), accommodating varied fabrication needs.
- Heat Treatment:
- Soft Annealing: Perform annealing at 600-700°C for 1-3 hours to achieve optimal softness and workability.
- Hot Working: Achieve desired material properties with hot working in a range of 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: Our products are certified under ASTM B888 and comply with RoHS and ELV standards. Mill Certificates are available to assure quality and compliance.
- Testing Reports: We provide comprehensive testing reports covering mechanical properties, conductivity, and thorough metallurgical analysis to guarantee performance.
- Customization: We offer customization options for non-standard sizes and advanced surface treatments like tin or silver plating, tailored to your specific requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) stands as a proud branch of the Huahong Group (A-STOCK : 002645.SZ). As a renowned manufacturer of copper alloy products in eastern China, strategically located near Shanghai, we are committed to excellence.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tube, efficient heat exchange tube, large diameter copper nickel pipe, copper alloy forged flanges, oxygen-free copper products and railway ground cable, has been formed annual production capacity of more than 30000 tons of copper products. Products are widely used on seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances and railway transit, etc.
And we wrote the National Standard of copper alloy seamless tube/pipe for Nuclear Power!
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