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: Impressive tensile strength ranging from 620 to 900 MPa and yield strength of 450 to 750 MPa, depending on the temper. This gives the material robust power and endurance.
High Conductivity: Outstanding electrical conductivity between 25 to 34 MS/m, translating to 45-60% IACS, surpassing the usual bronze or brass standards.
Stress Relaxation Resistance: Remarkable ability to maintain over 70% residual stress even at elevated temperatures of 200°C.
Formability: The product boasts exceptional cold workability, with a minimum bending radius of 2× the thickness, providing flexibility in design.
Eco-Certified: Proudly lead-free and compliant with global standards like RoHS and ELV, ensuring environmentally friendly 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 with a minimal bend radius of 2× thickness, enhancing versatility in manufacturing processes.
- Welding: Preferred welding methods include TIG and MIG for superior results, with soft soldering offering good outcomes.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours, this process refines and prepares the material effectively.
- Hot Working: Optimal conditions range between 800 and 950°C, suitable for achieving desired 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: Adheres to ASTM B888, RoHS, ELV, with mill certificates available to guarantee quality and compliance.
- Testing Reports: Comprehensive analysis includes mechanical properties, conductivity metrics, and metallurgical evaluations.
- Customization: Offers customization with non-standard sizes and surface treatments like tin and silver plating for tailored solutions.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.), a subsidiary of the renowned Huahong Group (A-STOCK : 002645.SZ), stands as a leading manufacturer of copper alloy products in eastern China, strategically located near Shanghai.
We specialize in the production of copper and copper alloy products includingadmiralty brass, naval brass, aluminum brass, cupronickel, and copper nickelcondenser 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 capacity exceeding 30,000 tons, our products find applications across seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit sectors.
In addition, we proudly contributed to drafting the National Standard for copper alloy seamless tubes and pipes tailored for Nuclear Power,
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