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 a robust tensile range of 620-900 MPa and a yield strength spanning 450-750 MPa (varying by temper), this alloy ensures superior durability and performance.
High Conductivity: With an impressive electrical conductivity of 25-34 MS/m (45-60% IACS), this alloy surpasses the capabilities of traditional bronze and brass.
Stress Relaxation Resistance: Exceptional ability to maintain over 70% residual stress even at elevated temperatures of 200°C.
Formability: Offers outstanding cold workability, accommodating a minimum bending radius of 2× the material's thickness, ideal for diverse applications.
Eco-Certified: Proudly lead-free and in full compliance with RoHS & ELV directives, meeting eco-friendly standards.
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, ensuring versatile manufacturing options.
- Welding: Optimal welding is achieved using TIG/MIG methods, offering excellent results, while soft soldering remains a good alternative.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours, ensuring optimal material properties.
- Hot Working: Efficient processing at temperatures ranging from 800-950°C.
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, ELV standards with Mill Certificates available to verify quality.
- Testing Reports: Includes comprehensive mechanical properties, conductivity, and metallurgical analysis reports for informed decision-making.
- Customization: Offers non-standard sizes and specialized surface treatments such as tin/silver plating to meet unique requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is an esteemed branch of Huahong Group (A-STOCK: 002645.SZ), recognized as a leading copper alloy products manufacturer in eastern China, strategically located near Shanghai.
We are specializing at the production of copper and copper alloy (admiralty 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 impressive annual production capacity exceeding 30,000 tons of copper products, our offerings are integral to various sectors including seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we proudly contributed to the writing of the National Standard of copper alloy seamless tube/pipe for Nuclear Power!
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