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: Boasting an impressive tensile strength ranging from 620-900 MPa and a yield strength of 450-750 MPa, this product offers robust performance tailored to various temper conditions.
High Conductivity: With electrical conductivity between 25-34 MS/m (45-60% IACS), it surpasses standard bronze and brass, ensuring premium performance for demanding applications.
Stress Relaxation Resistance: Remarkably retains more than 70% residual stress even when exposed to temperatures as high as 200°C.
Formability: Features outstanding cold workability with a minimum bending radius of just 2× the thickness, making it ideal for intricate designs.
Eco-Certified: Fully lead-free and meets stringent RoHS & ELV standards, reflecting our commitment to environmental 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: Perfectly suited for stamping and bending processes, maintaining a minimal bend radius of 2× thickness for optimal formability.
- Welding: Recommended welding techniques include TIG and MIG for excellent results, with good performance in soft soldering.
- Heat Treatment:
- Soft Annealing: Maintain at 600-700°C for 1-3 hours to achieve optimal softness.
- Hot Working: Best performed at 800-950°C for superior malleability.
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: Our products are certified under ASTM B888, RoHS, ELV standards, with detailed Mill Certificates available for verification.
- Testing Reports: Comprehensive reports covering mechanical properties, electrical conductivity, and metallurgical analysis ensure quality assurance.
- Customization: We offer non-standard sizes and advanced surface treatments like tin and silver plating to meet unique requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a distinguished branch of the Huahong Group (A-STOCK : 002645.SZ). Located conveniently near Shanghai, it stands as a prominent Copper Alloy products manufacturer in eastern China.
We are specializing at the production of copper and copper alloy (admiralty 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. With an annual production capacity exceeding 30,000 tons, our products excel in applications such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we proudly authored the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power!
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