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: This material boasts impressive tensile strength ranging from 620 to 900 MPa and yield strength between 450 and 750 MPa, varying by temper.
High Conductivity: Offers remarkable electrical conductivity of 25-34 MS/m, which translates to 45-60% IACS, surpassing the capabilities of standard bronze and brass.
Stress Relaxation Resistance: Exceptionally maintains over 70% of residual stress even at elevated temperatures of 200°C.
Formability: Demonstrates outstanding cold workability with a minimum bending radius of just 2× its thickness, ensuring versatile application.
Eco-Certified: Environmentally friendly and lead-free, this material complies with rigorous RoHS and ELV directives.
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.
- Welding: Preferred welding methods include TIG and MIG, which provide excellent results, while soft soldering offers good performance.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours to achieve optimal material properties.
- Hot Working: Performed at 800-950°C to ensure material adaptability and robustness.
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: The product meets standards such as ASTM B888, RoHS, and ELV, with Mill Certificates available for verification.
- Testing Reports: Comprehensive reports include mechanical properties, conductivity assessments, and metallurgical analysis.
- Customization: Offers customization with non-standard sizes and surface treatments like tin or silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a prestigious branch of the Huahong Group (A-STOCK: 002645.SZ), one of eastern China's leading manufacturers of copper alloy products, conveniently located near Shanghai.
We specialize in producing high-quality 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. Our production capacity exceeds 30,000 tons annually, catering to industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Moreover, we have contributed to writing the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Powerapplications.
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