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: Impressive tensile strength ranging from 620-900 MPa and yield strength between 450-750 MPa, varying by temper to meet demanding engineering needs.
High Conductivity: Boasting electrical conductivity levels of 25-34 MS/m (45-60% IACS), this alloy outperforms standard bronze and brass, ensuring enhanced performance.
Stress Relaxation Resistance: Exceptional stress relaxation resistance, maintaining over 70% residual stress at elevated temperatures of 200°C.
Formability: Features excellent cold workability with a minimum bending radius of just 2 times the material thickness, ensuring versatile application.
Eco-Certified: Environmentally friendly and lead-free, compliant with RoHS & ELV regulations, prioritizing 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: Ideally suited for stamping and bending processes, with a minimal bend radius of 2 times the thickness, ensuring precision.
- Welding: Recommended welding methods include TIG/MIG for excellent results and soft soldering for good performance.
- Heat Treatment:
- Soft Annealing: Best done at 600-700°C for 1-3 hours to achieve optimal softness and flexibility.
- Hot Working: Conducted efficiently between 800-950°C to maintain material integrity.
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: Certified by ASTM B888, RoHS, and ELV standards, with detailed Mill Certificates available for assurance.
- Testing Reports: Comprehensive testing reports covering mechanical properties, conductivity, and metallurgical analysis provide quality insights.
- Customization: Offering customization services for non-standard sizes and specialized surface treatments, including tin and silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a reputable branch of Huahong Group (A-STOCK : 002645.SZ), known for its expertise in producing high-quality Copper Alloy products, strategically positioned near Shanghai in eastern China.
We specialize in the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes and heat exchange solutions, offering large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. With an impressive annual production capacity exceeding 30,000 tons, our products are vital in industries like seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Moreover, we contributed to writing the National Standard for copper alloy seamless tubes/pipes applicable in Nuclear Powerindustries! A testament to our industry leadership.
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