Discover the exquisite specifications of our CuNi3Si1Mg (C70250), a pinnacle of advanced materials engineering.
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: Experience unparalleled tensile strength ranging from 620-900 MPa and a yield strength between 450-750 MPa, tailored to various tempers.
High Conductivity: Exceptional electrical conductivity rated at 25-34 MS/m, translating to 45-60% IACS, surpassing conventional bronze and brass standards.
Stress Relaxation Resistance: Ensures stability with more than 70% residual stress retention even at elevated temperatures up to 200°C.
Formability: Outstanding cold workability, allowing for a minimum bending radius of merely 2× thickness, empowering diverse applications.
Eco-Certified: Environmentally responsible, 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
- Cold Working: Perfectly suited for stamping and bending processes, maintaining a minimal bend radius of 2× thickness for optimal performance.
- Welding: Optimal welding techniques include TIG/MIG for superior results, with soft soldering also providing good outcomes.
- Heat Treatment:
- Soft Annealing: Conduct at 600-700°C for 1-3 hours to achieve desired mechanical properties.
- Hot Working: Best performed between 800-950°C to maintain structural integrity.
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 under ASTM B888, compliant with RoHS and ELV, with comprehensive Mill Certificates available.
- Testing Reports: Detailed reports encompass mechanical properties, conductivity, and metallurgical analysis, ensuring quality and reliability.
- Customization: Offers non-standard sizes and specialized surface treatments, including tin or silver plating, tailored to your needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a distinguished branch of Huahong Group (A-STOCK: 002645.SZ), recognized as a premier manufacturer of copper alloy products in eastern China, conveniently located near Shanghai.
Specializing in the production of copper and copper alloys, includingadmiralty brass, naval brass, aluminum brass, and cupronickel/copper nickel. Our extensive range includes condenser tubes, high-efficiency heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our annual production exceeds 30,000 tons of copper products serving industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Furthermore, we have authored the National Standard for copper alloy seamless tubes/pipes utilized in Nuclear Powerapplications!
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