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: Featuring an impressive tensile strength range of 620-900 MPa and a yield strength of 450-750 MPa, altering slightly by temper, this copper alloy is built to withstand tough conditions.
High Conductivity: Showcasing an outstanding electrical conductivity of 25-34 MS/m, translating to 45-60% IACS, surpasses standard bronze and brass in performance.
Stress Relaxation Resistance: Even at elevated temperatures of 200°C, it retains over 70% of its residual stress, proving its reliability in high-stress applications.
Formability: Exhibits excellent cold workability, with a minimal bending radius of merely 2 times the thickness, facilitating diverse fabrication needs.
Eco-Certified: Proudly lead-free and entirely compliant with RoHS and ELV standards, aligning with modern eco-friendly initiatives.
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 minimum bend radius of 2 times the material's thickness for optimal flexibility.
- Welding: Offers excellent results with TIG/MIG welding methods and good compatibility with soft soldering techniques.
- Heat Treatment:
- Soft Annealing: Keeping the material malleable through a controlled temperature range of 600-700°C for 1-3 hours.
- Hot Working: Efficient forming at 800-950°C unlocks new potential in manufacturing applications.
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 compliant with ASTM B888, RoHS, and ELV. Mill Certificates provide assurance of quality and performance.
- Testing Reports: Comprehensive testing includes mechanical properties, conductivity, and metallurgical analysis, ensuring unparalleled quality.
- Customization: Offers bespoke non-standard sizes and surface treatments like tin/silver plating, tailored to meet unique requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a Branch of Huahong Group (A-STOCK : 002645.SZ), a renowned manufacturer of Copper Alloy products situated in eastern China, conveniently close to Shanghai.
Specializing in premium copper and copper alloy products includingadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel), we produce a diverse range of items. 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 annual production capacity exceeds 30,000 tons, serving industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, we have authored the National Standard for copper alloy seamless tubes/pipes specifically crafted for Nuclear Powerapplications, ensuring top-tier safety and reliability.
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