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: This remarkable alloy showcases a tensile strength ranging from 620-900 MPa and a yield strength between 450-750 MPa, depending on the temper, ensuring unmatched durability.
High Conductivity: Offers exceptional electrical conductivity of 25-34 MS/m, equating to 45-60% IACS, making it a superior choice over standard bronze or brass for efficient energy transmission.
Stress Relaxation Resistance: Remarkably maintains over 70% of its residual stress even at elevated temperatures of 200°C, ensuring stability under pressure.
Formability: Displays outstanding cold workability, with a bending radius as minimal as 2× thickness, allowing for versatile shaping and forming processes.
Eco-Certified: This environmentally friendly product is lead-free and adheres strictly to RoHS & ELV standards, meeting global eco-conscious requirements.
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 precision stamping and bending operations with a minimum bend radius of 2× thickness, ensuring high efficiency in manufacturing.
- Welding: Recommended welding methods include TIG and MIG for excellent results, while soft soldering remains a good alternative.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours to optimize material properties.
- Hot Working: Ideal temperature range is 800-950°C for achieving optimal mechanical performance.
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 certifications including ASTM B888, RoHS, and ELV, with detailed Mill Certificates readily available for quality assurance.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis provide transparency and trust.
- Customization: Offers customization in non-standard sizes and surface treatments such as tin or silver plating to meet diverse customer needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) represents a significant branch of the prestigious Huahong Group (A-STOCK: 002645.SZ), a renowned leader in copper alloy manufacturing located in eastern China, conveniently close to Shanghai.
Our expertise lies in the production of copper and copper alloy products such asadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, state-of-the-art heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our annual production capacity surpasses 30,000 tons, catering to various sectors including seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, centralized air-conditioning, household appliances, and railway transit.
Moreover, we proudly authored the National Standard for copper alloy seamless tubes and pipes used in Nuclear Powerindustries, showcasing our technical prowess and commitment to excellence.
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