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: Exhibiting unparalleled tensile strength ranging from 620 to 900 MPa, and yield strength varying between 450 to 750 MPa, this alloy adapts brilliantly across different tempers.
High Conductivity: Boasting an impressive electrical conductivity of 25-34 MS/m (equivalent to 45-60% IACS), it outshines standard bronze and brass, offering superior electrical performance.
Stress Relaxation Resistance: Ensuring longevity and reliability, the alloy maintains over 70% residual stress even when exposed to temperatures up to 200°C.
Formability: Delight in its exceptional cold workability with a minimal bending radius of just 2× its thickness, catering to complex fabrication needs.
Eco-Certified: Environmentally conscious and lead-free, fully compliant with RoHS and ELV standards for sustainable applications.
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, maintaining a minimum bend radius of 2× thickness for precision results.
- Welding: Opt for TIG/MIG methods for excellent results or soft soldering for good performance, tailored to your project's welding needs.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for a duration of 1-3 hours, optimizing the material for further processing.
- Hot Working: Achieved at temperatures between 800-950°C, ensuring optimal structural integrity and 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: Certified under ASTM B888, RoHS, and ELV; comprehensive Mill Certificates are available to verify authenticity and quality.
- Testing Reports: Detailed documentation covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Offering bespoke solutions with non-standard sizes and specialized surface treatments like tin or silver plating to meet diverse needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a prestigious arm of the renowned Huahong Group (A-STOCK : 002645.SZ), a leading copper alloy products manufacturer strategically located in eastern China, close to the dynamic city of Shanghai.
We specialize in the sophisticated production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, high-efficiency 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, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, ensuring unparalleled quality and performance.
Additionally, we proudly contributed to drafting the National Standard for copper alloy seamless tube/pipe, setting benchmarks for Nuclear Power.
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