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: With an impressive tensile strength ranging from 620 to 900 MPa and a yield strength of 450 to 750 MPa depending on the temper, this alloy exemplifies robust performance.
High Conductivity: Electrical conductivity ranges from 25 to 34 MS/m, reaching 45-60% IACS, significantly surpassing common bronze and brass, ensuring high efficiency.
Stress Relaxation Resistance: Retains more than 70% residual stress even at a temperature of 200°C, ensuring reliability under thermal stress.
Formability: Excels in cold workability with a minimum bending radius of 2× the thickness, facilitating versatile applications.
Eco-Certified: Completely lead-free and adheres to RoHS & ELV standards, promoting an environmentally friendly approach.
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 stamping and bending processes, maintaining a minimum bend radius of 2× thickness to ensure versatility in manufacturing.
- Welding: TIG/MIG welding is highly effective, while soft soldering offers good results, expanding your processing options.
- Heat Treatment:
- Soft Annealing: Perform at 600-700°C for 1-3 hours to achieve optimal material softness.
- Hot Working: Conduct at temperatures between 800-950°C for effective shaping and forming.
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: Certified under ASTM B888, RoHS, and ELV. Mill Certificates are available to guarantee quality and compliance.
- Testing Reports: Extensive reports include mechanical properties, conductivity, and metallurgical analysis for thorough assessment.
- Customization: Offers non-standard sizes and various 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 branch of the prestigious Huahong Group (A-STOCK : 002645.SZ). Located near Shanghai, this esteemed manufacturer specializes in copper alloy products.
We are leaders in producing copper and copper alloy solutions, includingadmiralty brass, naval brass, aluminum brass, cupronickel, and copper nickel.Our portfolio encompasses condenser tubes, efficient heat exchange tubes, and large diameter copper nickel pipes. We also offer copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our annual production capacity exceeds 30,000 tons, with applications spanning seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, we contributed to drafting the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Powerapplications!
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