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: Delivering a robust tensile strength ranging from 620 to 900 MPa and a yield strength between 450 to 750 MPa, depending on temper, showcasing exceptional durability.
High Conductivity: Exhibits outstanding electrical conductivity of 25-34 MS/m (45-60% IACS), surpassing that of standard bronze or brass, ensuring superior energy efficiency.
Stress Relaxation Resistance: Remarkable capability to maintain over 70% residual stress even at elevated temperatures of 200°C, providing reliability under demanding conditions.
Formability: Exceptional cold workability with a minimum bending radius of 2× thickness, allowing for versatile design and application flexibility.
Eco-Certified: Lead-free and environmentally conscious, fully compliant with RoHS & ELV standards, affirming our commitment to sustainability.
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 minimal bend radius of 2× thickness, ensuring ease of processing and shaping.
- Welding: Recommended welding methods include TIG/MIG (excellent results) and soft soldering (good results), providing flexible joining solutions.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours, enhancing material workability.
- Hot Working: Performed at temperatures between 800-950°C, optimizing material properties.
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: Meets ASTM B888, RoHS, and ELV standards; Mill Certificates are available upon request, ensuring product quality and compliance.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis, guaranteeing product integrity.
- Customization: Offering non-standard sizes and surface treatments such as tin or silver plating, tailored to meet specific customer needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a distinguished branch of the illustrious Huahong Group (A-STOCK: 002645.SZ), a renowned manufacturer of copper alloy products located in eastern China, in close proximity to Shanghai.
Specializing in the production of a diverse array of copper and copper alloy products includingadmiralty 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, with an impressive annual production capacity exceeding 30,000 tons. These products are integral to industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we proudly contributed to the formulation of the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Power!
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