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 boasts a tensile strength ranging from 620-900 MPa and a yield strength of 450-750 MPa, making it adaptable to various temper conditions.
High Conductivity: Experience superior electrical conductivity with values between 25-34 MS/m (45-60% IACS), outperforming traditional bronze and brass options.
Stress Relaxation Resistance: Even at elevated temperatures of 200°C, this alloy maintains impressively over 70% of its residual stress.
Formability: Offering excellent cold workability, this alloy can be bent with a minimum radius of just 2× its thickness, providing versatility in manufacturing.
Eco-Certified: Committed to sustainability, this product is lead-free and adheres to stringent RoHS and ELV standards.
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 applications, maintaining a minimum bend radius of 2× thickness for robust versatility.
- Welding: Employ methods such as TIG/MIG for excellent results, or opt for soft soldering for good performance.
- Heat Treatment:
- Soft Annealing: Achieve optimal softness with a temperature range of 600-700°C for 1-3 hours.
- Hot Working: Conduct at temperatures between 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 to ASTM B888, RoHS, and ELV standards; Mill Certificates provided for assurance.
- Testing Reports: Comprehensive reports include mechanical properties, conductivity, and metallurgical analysis.
- Customization: Tailor-made solutions available with non-standard sizes and surface treatments, including tin and silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a distinguished branch of the renowned Huahong Group (A-STOCK : 002645.SZ), a leading copper alloy products manufacturer strategically situated in eastern China, near the vibrant city of Shanghai.
We excel in the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, superior heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. With an annual production capacity exceeding 30,000 tons, our products are integral to industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbine manufacturing, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, among others.
Additionally, we have authored the National Standard for copper alloy seamless tubes/pipes utilized in Nuclear Power.
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