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: Boasting impressive tensile strength ranging from 620 to 900 MPa and yield strength between 450 and 750 MPa, depending on the temper, this copper alloy demonstrates phenomenal resilience.
High Conductivity: This exceptional alloy offers electrical conductivity of 25-34 MS/m, equating to 45-60% IACS, surpassing traditional bronze and brass, making it ideal for high-performance applications.
Stress Relaxation Resistance: It retains more than 70% of residual stress even when exposed to temperatures as high as 200°C, ensuring lasting performance.
Formability: Offers excellent cold workability, with a minimum bending radius of just 2× the thickness, allowing for versatile shaping options.
Eco-Certified: Environmentally friendly and lead-free, compliant with RoHS & ELV standards, ensuring safety and 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: Perfect for stamping and bending processes with a minimal bend radius of 2× the thickness, ensuring adaptability in manufacturing.
- Welding: Recommended welding methods include TIG/MIG for superior results, and soft soldering is also effective.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours, ensuring optimal material properties.
- Hot Working: Best performed between 800-950°C for enhanced malleability.
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, with comprehensive Mill Certificates available for validation.
- Testing Reports: Detailed reports available covering mechanical properties, conductivity, and metallurgical analysis for assured quality control.
- Customization: Offers customized non-standard sizes and surface treatments, including tin and silver plating, to meet specific client needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a proud branch of the Huahong Group (A-STOCK: 002645.SZ), renowned for manufacturing superior copper alloy products in Eastern China, strategically located near Shanghai.
We specialize in producing an extensive range 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, and oxygen-free copper products. Our impressive annual production capacity exceeds 30,000 tons. Our products serve critical roles in industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, ensuring global application efficiency and reliability.
And we contributed to writing the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power, underscoring our leadership in material innovation and regulatory compliance.
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