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: Exceptional tensile strength ranging between 620-900 MPa and a yield strength of 450-750 MPa, varying by temper, makes it ideal for demanding applications.
High Conductivity: Offering electrical conductivity of 25-34 MS/m, or 45-60% IACS, this material surpasses standard bronze and brass, ensuring superior performance.
Stress Relaxation Resistance: Retains more than 70% of its residual stress even at elevated temperatures of 200°C, providing outstanding reliability under stress.
Formability: Boasting excellent cold workability with a minimum bending radius of just 2× the thickness, it ensures ease of shaping for various applications.
Eco-Certified: Lead-free and fully compliant with RoHS & ELV standards, this eco-friendly material aligns with sustainable practices.
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, with a minimum bend radius of 2× thickness for precision and flexibility.
- Welding: Recommended welding methods include TIG/MIG, which is excellent, and soft soldering, which is good, for versatile assembly.
- Heat Treatment:
- Soft Annealing: Achieve optimal softness with 600-700°C temperature range held for 1-3 hours.
- Hot Working: Conduct hot working within the 800-950°C range for enhanced material properties.
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 to ASTM B888, RoHS, and ELV standards, with comprehensive Mill Certificates available for scrutiny.
- Testing Reports: Detailed reports available covering mechanical properties, conductivity, and metallurgical analysis to ensure product quality.
- Customization: Offers non-standard sizes and surface treatments such as tin and silver plating to meet diverse requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a proud branch of the esteemed Huahong Group (A-STOCK : 002645.SZ). As a renowned Copper Alloy products manufacturer situated in eastern China, near Shanghai, we excel in delivering top-notch solutions.
We specialize in the production of copper and copper alloy 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. 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.
And we are delighted to have authored the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power! Proudly contributing to the advancement of this critical energy sector.
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