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 ultimate durability with tensile strength ranging between 620-900 MPa, and yield strength from 450-750 MPa, adjustable per temper.
High Conductivity: Enjoy exceptional electrical conductivity rated at 25-34 MS/m (45-60% IACS), surpassing standard bronze or brass.
Stress Relaxation Resistance: Exceptional resilience, maintaining over 70% residual stress at high temperatures up to 200°C.
Formability: Remarkable cold workability with a minimum bending radius of just 2× the material's thickness.
Eco-Certified: Environmentally friendly and lead-free, 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, with a minimum bend radius of 2× thickness for optimal flexibility.
- Welding: Preferred welding methods are TIG/MIG for superior results, with good performance in soft soldering.
- Heat Treatment:
- Soft Annealing: A controlled process at 600-700°C for 1-3 hours to achieve desired softness.
- Hot Working: Conducted efficiently within the 800-950°C 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: Proudly certified under ASTM B888, RoHS, and ELV; Mill Certificates provided to ensure quality.
- Testing Reports: Comprehensive analyses including mechanical properties, conductivity, and metallurgical insight.
- Customization: Tailored solutions with non-standard sizes and premium surface treatments like tin/silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is an esteemed branch of the Huahong Group (A-STOCK : 002645.SZ), renowned for its innovation in copper alloy products, located strategically near Shanghai in eastern China.
We excel in producing premium copper and copper alloys 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 extensive production capacity exceeds 30,000 tons annually, serving industries like seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, we proudly contributed to drafting the National Standard for copper alloy seamless tubes/pipes specifically designed for Nuclear Powerapplications!
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