Unveil the Exceptional Product Features 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
High Strength: This alloy demonstrates remarkable tensile strength ranging from 620 to 900 MPa and a yield strength of 450 to 750 MPa, which varies based on the temper, making it ideal for demanding applications.
High Conductivity: With an electrical conductivity of 25-34 MS/m, equivalent to 45-60% IACS, this material surpasses standard bronze and brass, offering superior electrical performance.
Stress Relaxation Resistance: Remarkably, it maintains over 70% residual stress even at elevated temperatures of 200°C, ensuring reliability in high-stress environments.
Formability: Boasting excellent cold workability with a minimal bending radius of just 2× thickness, it is perfect for intricate designs and complex manufacturing processes.
Eco-Certified: Proudly lead-free and fully compliant with RoHS & ELV directives, supporting sustainable and eco-friendly manufacturing.
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, with a minimum bend radius of 2× thickness, facilitating versatile manufacturing applications.
- Welding: Recommended welding techniques include TIG and MIG, which are excellent, and soft soldering, which is rated as good, ensuring versatile assembly options.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours, optimizing material properties.
- Hot Working: Performed at 800-950°C, enhancing material flexibility and durability.
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, RoHS, and ELV standards, with Mill Certificates available for assurance of quality and compliance.
- Testing Reports: Comprehensive testing reports available, including assessments of mechanical properties, conductivity, and metallurgical analysis.
- Customization: Tailored solutions available with non-standard sizes and optional surface treatments such as tin or silver plating for specialized applications.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a distinguished branch of Huahong Group, a prominent A-Stock listed company (002645.SZ). As a leader in the copper alloy industry, strategically positioned near Shanghai, we excel in innovation and quality production.
Specializing in the production of premium copper and copper alloy products includingadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel, we offer a comprehensive product range encompassing condenser tubes, efficient heat exchange tubes, and large diameter copper nickel pipes. Our expertise extends to copper alloy forged flanges and oxygen-free copper products, as well as railway ground cables. Achieving a robust annual production capacity exceeding 30,000 tons, our products serve diverse sectors such as seawater desalination, nuclear power, petrochemical, marine engineering, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, we have contributed to the development of the National Standard for copper alloy seamless tubes/pipes in Nuclear Power, solidifying our reputation as industry pioneers.
){kind=link}