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: Experience unparalleled mechanical strength with tensile strength ranging between 620-900 MPa and yield strength from 450-750 MPa, subject to temper variations.
High Conductivity: Enjoy superior electrical performance with conductivity levels of 25-34 MS/m, translating to 45-60% IACS, outshining standard bronze and brass.
Stress Relaxation Resistance: Remarkable stress retention, maintaining over 70% residual stress even at elevated temperatures of 200°C.
Formability: Benefit from excellent cold workability, with a minimum bending radius of just two times the material thickness.
Eco-Certified: Committed to sustainability, this product is lead-free and 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: Ideal for stamping and bending applications, with a minimum bend radius set at twice the thickness.
- Welding: Highly adaptable to various welding techniques, with TIG/MIG methods providing excellent results and soft soldering offering good compatibility.
- Heat Treatment:
- Soft Annealing: Conduct at temperatures ranging from 600-700°C for a duration of 1-3 hours.
- Hot Working: Optimal within the 800-950°C temperature range.
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 under ASTM B888, RoHS, and ELV; Mill Certificates are available for your assurance.
- Testing Reports: Comprehensive testing reports covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Tailor your order 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 branch of the Huahong Group (A-STOCK: 002645.SZ), a renowned manufacturer of Copper Alloy products in eastern China, conveniently located near Shanghai.
We are experts in the production of copper and copper alloy products such asadmiralty 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. Our annual production capacity exceeds 30,000 tons of copper products, catering to diverse industries including seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, we proudly authored the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power.
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