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: Unleashing superior mechanical prowess, this alloy boasts a tensile strength of 620-900 MPa and a yield strength ranging from 450-750 MPa, depending on the temper.
High Conductivity: Experience exceptional electrical performance with conductivity levels of 25-34 MS/m (45-60% IACS), surpassing the usual standards of bronze and brass.
Stress Relaxation Resistance: Engineered for endurance, it retains over 70% of residual stress even at elevated temperatures of 200°C.
Formability: Versatile in application, it offers excellent cold workability with a minimum bending radius of 2× the thickness.
Eco-Certified: A stride towards sustainability, this lead-free product is fully compliant with RoHS & ELV 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: This alloy can be precisely shaped through stamping and bending, with a minimum bend radius of 2× thickness.
- Welding: Optimal welding performance with TIG/MIG methods (excellent) and good results with soft soldering.
- Heat Treatment:
- Soft Annealing: Soften your material with a gentle heat range of 600-700°C for 1-3 hours.
- Hot Working: Malleable and formable between the temperatures of 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: This product meets and exceeds the standards of ASTM B888, RoHS, ELV; Mill Certificates are available upon request.
- Testing Reports: Comprehensive reports include analyses of mechanical properties, electrical conductivity, and metallurgical composition.
- Customization: Tailor to your needs with non-standard sizes and specialized surface treatments such as tin or silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) is a distinguished division of Huahong Group (A-STOCK : 002645.SZ), recognized as a leading manufacturer of copper alloy products in eastern China, conveniently located near Shanghai.
Our expertise lies in producing a comprehensive 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, oxygen-free copper products, and railway ground cables. Our expansive production capability exceeds 30,000 tons annually, meeting diverse application needs in seawater desalination, nuclear power, petrochemical industries, marine engineering, steam turbines, pressure vessels, heat exchangers, central air-conditioning systems, household appliances, and railway transit sectors.
In addition, we proudly authored the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power!
){kind=link}