Discover the Superior Product Details of 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
Robust High Strength Performance: Experience an impressive tensile strength ranging from 620-900 MPa and a yield strength of 450-750 MPa, adaptable to various tempers.
Exceptional High Conductivity: Boasting electrical conductivity of 25-34 MS/m (45-60% IACS), this alloy surpasses standard bronze and brass.
Outstanding Stress Relaxation Resistance: Capable of maintaining over 70% residual stress even at elevated temperatures of 200°C.
Excellent Formability: Offers superior cold workability with a minimum bending radius of just 2× the material's thickness.
Eco-Friendly Certification: This product is lead-free and fully compliant with RoHS & ELV regulations.
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
- Efficient Cold Working: Perfect for stamping and bending processes with a minimum bend radius of 2× thickness.
- Versatile Welding Options: TIG/MIG methods are highly recommended for their excellent results, alongside good soft soldering capabilities.
- Comprehensive Heat Treatment:
- For optimal softness, anneal at 600-700°C for 1-3 hours.
- Hot Working: Optimal temperature range is 800-950°C for best 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
- Extensive Certifications: Fully certified under ASTM B888, RoHS, ELV with Mill Certificates available upon request.
- Detailed Testing Reports: Includes comprehensive mechanical properties, conductivity, and metallurgical analysis documentation.
- Customization Options: Offering non-standard sizes and specialized surface treatments like tin/silver plating to meet diverse needs.
Company Reference
Located in 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 leader in the production of copper alloy products in eastern China, conveniently situated near Shanghai.
Our specialization encompasses a wide array of copper and copper alloy products, includingadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) 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. Our products are extensively utilized in sectors such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air conditioning, household appliances, and railway transit.
Furthermore, we have contributed by authoring the National Standard for copper alloy seamless tubes and pipes used in Nuclear Power.
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