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 impressive tensile strength of 620-900 MPa and a yield strength of 450-750 MPa, this material's mechanical prowess varies by temper, making it ideal for demanding applications.
High Conductivity: With electrical conductivity ranging from 25-34 MS/m (45-60% IACS), it surpasses standard bronze and brass, ensuring superior electrical performance.
Stress Relaxation Resistance: Exceptionally maintains over 70% residual stress even at elevated temperatures of 200°C, ensuring reliability under thermal stress.
Formability: Showcasing excellent cold workability with a minimum bending radius of just 2× the thickness, this material is perfect for intricate designs.
Eco-Certified: Completely lead-free and compliant with RoHS & ELV standards, making it an environmentally responsible choice.
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 stamping and bending processes with a minimum bend radius of 2× thickness, ensuring versatility in manufacturing.
- Welding: Preferred welding methods include TIG/MIG for excellent results, and soft soldering for good performance, enhancing application flexibility.
- Heat Treatment:
- Soft Annealing: Conduct at 600-700°C for 1-3 hours to achieve desired material conditions.
- Hot Working: Best performed within a temperature range of 800-950°C for optimal results.
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: Fully certified under ASTM B888, RoHS, and ELV; with comprehensive Mill Certificates readily available.
- Testing Reports: Our detailed reports cover mechanical properties, conductivity, and thorough metallurgical analysis, ensuring quality assurance.
- Customization: Offering tailored non-standard sizes and specialized surface treatments like tin or silver plating to meet unique specifications.
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 reputable manufacturer of Copper Alloy products situated in eastern China, conveniently close to Shanghai.
We specialize in the 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. Our extensive annual production capacity exceeds 30,000 tons of copper products. These products find their place in a multitude of sectors including seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, ensuring versatility and widespread applicability.
Additionally, we proudly contributed to developing the National Standard for copper alloy seamless tubes/pipes utilized in Nuclear Power, a testament to our commitment to quality and innovation.
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