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 of 620-900 MPa and a yield strength ranging from 450-750 MPa, depending on temper.
High Conductivity: Delivers remarkable electrical conductivity of 25-34 MS/m (45-60% IACS), surpassing standard bronze and brass.
Stress Relaxation Resistance: Capably maintains over 70% of its residual stress even when exposed to 200°C, ensuring reliability.
Formability: Exceptional cold workability, allowing a bending radius as tight as 2× thickness, ideal for complex forms.
Eco-Certified: Environmentally friendly and lead-free, adhering to RoHS and 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: Ideal for processes such as stamping and bending with a minimum bend radius of 2× thickness.
- Welding: TIG/MIG welding is recommended as excellent, with good results from soft soldering methods.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours for optimal performance.
- Hot Working: Best performed between 800-950°C to ensure material 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: Compliant with ASTM B888, RoHS, and ELV, with mill certificates readily available for assurance.
- Testing Reports: Includes mechanical properties, comprehensive conductivity data, and metallurgical analysis insights.
- Customization: Offers bespoke sizes and surface treatments such as tin and silver plating to meet specific needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a dynamic branch under the prestigious Huahong Group (A-STOCK: 002645.SZ). As a renowned manufacturer of copper alloy products in eastern China, located conveniently near Shanghai.
We specialize in producing a diverse range of copper and copper alloy products, includingadmiralty brass, naval brass, aluminum brass, and cupronickel/copper nickelcondenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, and oxygen-free copper products. We boast an impressive annual production capacity exceeding 30,000 tons of copper products. Our products find extensive application across 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 proudly authored the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Powerapplications!
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